[merlin/orion] Crown Modification  

Everything you need to motorize your head
User avatar
claudevh
Moderator
 
Topic author
Posts: 1349
Likes: 0 post
Liked in: 0 post
Joined: Sun Nov 25, 2007 11:12 pm
Location: Mont-Saint-André (Belgium)
Info

[merlin/orion] Crown Modification

by claudevh » Fri Nov 14, 2008 6:51 pm

Of course, you have not to purchase new module and BT, but my english is very poor ...
I will write the documents and you can correct them ?

For the 'off-the-shelf' replacement crown, I have seen some interresting "astronomical" stuff's ... I thing mainly to "Bader Planetarium" system to adapt their universal system to the Celestron Nexstar GT mount series who share basically a lot of pieces with the Merlin/Orion (same mother company = Synta), see the next links (all in german):
http://www.baader-planetarium.de/universalklemme/goto-plattform.htm
http://www.baader-planetarium.de/download/universalklemme.pdf

I have no time at the moment to take more informations, but I thing that the "overal" dimensions (mainly the thickness)
of the Baader pieces are more favorable and will permit to win additional "mm" !
Anyway the mounting piece will fit perfectly the Merlin head in replacement of the original one !

Maybe can "klausesser" help-us ?

Thanks in advance Klaus ...


:cool: Claude :cool:
Merlin + Papywizard on Windows 7 & Nokia 770 § N810 & Acer (Netbook) + PanoramaApp Androïd + Deltawave PapyMerlin BT + Autopano
Spherical Pano (180 x 360) with Canon 40D + Canon EF-S 10-22mm f/3.5-4.5 Zoom & Pôle Pano with Canon 5D MK2 and shaved Tokina 10-17 3.5-4.5 AF DX Fisheye
Gigapixel photography with Nikon D200 + Sigma 70-200 F 2.8 EX DG APO HSM

User avatar
fma38
Moderator
 
Posts: 5850
Likes: 2 posts
Liked in: 2 posts
Joined: Wed Dec 07, 2005 6:21 pm
Location: Grenoble, France
Info

by fma38 » Fri Nov 14, 2008 8:46 pm

claudevh wrote:For the 'off-the-shelf' replacement crown, I have seen some interresting "astronomical" stuff's ... I thing mainly to "Bader Planetarium" system to adapt their universal system to the Celestron Nexstar GT mount series who share basically a lot of pieces with the Merlin/Orion (same mother company = Synta), see the next links (all in german):
http://www.baader-planetarium.de/universalklemme/goto-plattform.htm
http://www.baader-planetarium.de/download/universalklemme.pdf

I have no time at the moment to take more informations, but I thing that the "overal" dimensions (mainly the thickness)
of the Baader pieces are more favorable and will permit to win additional "mm" !
Anyway the mounting piece will fit perfectly the Merlin head in replacement of the original one !

This is great! Any idea of the price of such crown?
Frédéric

no avatar
mediavets
Moderator
 
Posts: 16415
Likes: 2 posts
Liked in: 130 posts
Joined: Wed Nov 14, 2007 2:12 pm
Location: Isleham, Cambridgeshire, UK.
Info

by mediavets » Fri Nov 14, 2008 9:53 pm

fma38 wrote:
claudevh wrote:For the 'off-the-shelf' replacement crown, I have seen some interresting "astronomical" stuff's ... I thing mainly to "Bader Planetarium" system to adapt their universal system to the Celestron Nexstar GT mount series who share basically a lot of pieces with the Merlin/Orion (same mother company = Synta), see the next links (all in german):
http://www.baader-planetarium.de/universalklemme/goto-plattform.htm
http://www.baader-planetarium.de/download/universalklemme.pdf

I have no time at the moment to take more informations, but I thing that the "overal" dimensions (mainly the thickness)
of the Baader pieces are more favorable and will permit to win additional "mm" !
Anyway the mounting piece will fit perfectly the Merlin head in replacement of the original one !

This is great! Any idea of the price of such crown?

I think I finally located a price - they seem to have no search facility on their web site,ugh! - you'll find the item about 3/4 of the way down this page:
http://www.baader-planetarium.de/zubehoer/statmont/montagezubeh.htm#universalklemme

There appear to be two models - one is 74 Euros (approx. GBP 64, US$ 94), the other 85 Euros (approx. GBP 72, US$ 108 ), not sure whether this is including or excluding VAT.

It looks good, but this is more than I would wish to pay, but I/we wouldn't want their dovetail bracket for mounting a telescope anyway.

I was quoted nearly GBP 90 for a one-off crown machined to Thierry's drawings by local engineering company;far more than I was willing to pay.

I think I'd be happy to pay say GBP 25 for a crown made to Thierry's spec., I would consider it at GBP 40, maybe reluctantly purchase at GBP 50 but I really would not want to pay more than that. Perhaps my expectations are unrealistic?

BTW what exactly does the 'red disc' do that has to be transferred from the old crown to the replacement? The German word 'Mitnehmerscheibe' is translated (by Babel Fish) as 'driving disk' but that does not really explain it's function for me. What is it made of? Could you make one if the original got damaged when removing it from the original crown?
Last edited by mediavets on Fri Nov 14, 2008 10:03 pm, edited 1 time in total.
Andrew Stephens
Many different Nodal Ninja and Agnos pano heads. Merlin/Panogear mount with Papywizard on Nokia Internet tablets.
Nikon D5100 and D40, Sigma 8mm f3.5 FE, Nikon 10.5mm FE, 35mm, 50mm, 18-55mm, 70-210mm. Promote control.

User avatar
fma38
Moderator
 
Posts: 5850
Likes: 2 posts
Liked in: 2 posts
Joined: Wed Dec 07, 2005 6:21 pm
Location: Grenoble, France
Info

by fma38 » Fri Nov 14, 2008 10:53 pm

Thanks for the price. We should ask them if they can make us a better price if we buy several pieces at a time...

The red disk is the friction system, allowing you to turn the axis without braking the gears. It can be more a less hard to turn depending of the nut position.
Frédéric

User avatar
claudevh
Moderator
 
Topic author
Posts: 1349
Likes: 0 post
Liked in: 0 post
Joined: Sun Nov 25, 2007 11:12 pm
Location: Mont-Saint-André (Belgium)
Info

by claudevh » Fri Nov 14, 2008 11:24 pm

Hey Stop !

I have no idea if those pieces are wel adapted to what we want !
I have no idea about the dimensions of the pieces, mainly the tickness who should be much lesser than the original crown otherways we will just win nothing !

The difference between the 2 prices come from the dovetail part

:|




:cool: Claude :cool:
Merlin + Papywizard on Windows 7 & Nokia 770 § N810 & Acer (Netbook) + PanoramaApp Androïd + Deltawave PapyMerlin BT + Autopano
Spherical Pano (180 x 360) with Canon 40D + Canon EF-S 10-22mm f/3.5-4.5 Zoom & Pôle Pano with Canon 5D MK2 and shaved Tokina 10-17 3.5-4.5 AF DX Fisheye
Gigapixel photography with Nikon D200 + Sigma 70-200 F 2.8 EX DG APO HSM

no avatar
mediavets
Moderator
 
Posts: 16415
Likes: 2 posts
Liked in: 130 posts
Joined: Wed Nov 14, 2007 2:12 pm
Location: Isleham, Cambridgeshire, UK.
Info

by mediavets » Fri Nov 14, 2008 11:45 pm

claudevh wrote:Hey Stop !

I have no idea if those pieces are wel adapted to what we want !
I have no idea about the dimensions of the pieces, mainly the tickness who should be much lesser than the original crown otherways we will just win nothing !
:|

True - but at least we know they have the capability and experience to make a part that would suit our needs.
Andrew Stephens
Many different Nodal Ninja and Agnos pano heads. Merlin/Panogear mount with Papywizard on Nokia Internet tablets.
Nikon D5100 and D40, Sigma 8mm f3.5 FE, Nikon 10.5mm FE, 35mm, 50mm, 18-55mm, 70-210mm. Promote control.

User avatar
Paul
Member
 
Posts: 778
Likes: 0 post
Liked in: 0 post
Joined: Sat Aug 30, 2008 4:46 pm
Location: Bonn, Germany
Info

by Paul » Sat Nov 15, 2008 9:30 am

claudevh wrote:I have no idea if those pieces are wel adapted to what we want ! I have no idea about the dimensions of the pieces

Here is a PDF, which shows the clamp-exchange on NexStar-Mount.
http://www.baader-planetarium.de/download/universalklemme.pdf

I mailed to Baader asking them for the dimensions of the crownplate and if they will sell the crownplate only.
IMO it is more flexible to mount a fixed guide rail on the crown with an adjustable/slideable quick release

pics shows the prototype-rail of my robot, on Merlin the rail can be much smaller


Last edited by Paul on Sat Nov 15, 2008 11:04 am, edited 1 time in total.
Paul

close, but no cigar ... ... ...

User avatar
fma38
Moderator
 
Posts: 5850
Likes: 2 posts
Liked in: 2 posts
Joined: Wed Dec 07, 2005 6:21 pm
Location: Grenoble, France
Info

by fma38 » Sat Nov 15, 2008 10:23 am

Could someone contact them to know if they can sell the crown alone? And to ask them for the exact dimensions...


Frédéric

User avatar
Paul
Member
 
Posts: 778
Likes: 0 post
Liked in: 0 post
Joined: Sat Aug 30, 2008 4:46 pm
Location: Bonn, Germany
Info

by Paul » Sat Nov 15, 2008 10:25 am

fma38 wrote:Could someone contact them to know if they can sell the crown alone? And to ask them for the exact dimensions...

someone did it :/

http://www.autopano.net/forum/p32688-today-09-30-48#p32688
Last edited by Paul on Sat Nov 15, 2008 10:25 am, edited 1 time in total.
Paul

close, but no cigar ... ... ...

User avatar
fma38
Moderator
 
Posts: 5850
Likes: 2 posts
Liked in: 2 posts
Joined: Wed Dec 07, 2005 6:21 pm
Location: Grenoble, France
Info

by fma38 » Sat Nov 15, 2008 10:26 am

As far as I understand, the red disc is not supplied, and needs to be transfered from the old system. But this is not a problem (I did it with Trekker's crown).

Ok, I'll try to send them a e-mail...
Frédéric

User avatar
Paul
Member
 
Posts: 778
Likes: 0 post
Liked in: 0 post
Joined: Sat Aug 30, 2008 4:46 pm
Location: Bonn, Germany
Info

by Paul » Sat Nov 15, 2008 10:29 am

fma38 wrote:Ok, I'll try to send them a e-mail...

Hi Frederic, again: I did it already, send them a mail, asking for dimensions and if they will sell it separate ...
Paul

close, but no cigar ... ... ...

no avatar
mediavets
Moderator
 
Posts: 16415
Likes: 2 posts
Liked in: 130 posts
Joined: Wed Nov 14, 2007 2:12 pm
Location: Isleham, Cambridgeshire, UK.
Info

by mediavets » Tue Nov 18, 2008 11:25 am

bigwade wrote:But, even this Merlin unit, right out the box, without PDA can be a great help to do multishot/mosaic in my studio.
I am now using this: http://tinyurl.com/yr9jkn
rotating by hand:
Mostly with a 70-200mm or 300mm (5DCanon)

Frank

Frank,

AFAIK you will not be able to mount your 5D on the Merlin head in either landscape or portrait orientation at the NPP without mechanical modifications to the head - the space/dimension between the axis of vertical rotation and the face of the dovetail clamp on the horizontal axis is too small. It is just about perfect for small body DSLRs like my Nikon D40 and the Olympus E-510 but not for anything bigger.

The simplest (and IMO the most elegant) modification - which should allow correct NPP positioning with the camera in portrait orientation - is to replace the 'crown' with the dovetail clamp on the horizontal axis with a 'slimmer' part. A few Merlin users, including Frederic (fma38), have done this and it works well.
http://www.autopano.net/forum/p30634-2008-10-12-19-23-59#p30634

The 'downside' is that at present you have to have the replacement crown custom-made, although there are drawings available for the part. I was quoted GBP 90 for a one-off by a local engineering company.
http://www.autopano.net/forum/postgallery.php?pid=30835&filename=crown_merlin_mod_thierry.jpg

We have identified a German company, that makes parts for similar telescope mounts, who may be able to make the part cheaper than this; Paul is investigating.
http://www.autopano.net/forum/p32660-2008-11-14-17-51-02#p32660

Others have sought to achieve a similar effect by separating the two castings that make up the chassis of the Merlin head and moving the vertical 'arm' sideways; I believe that Paul and Claude are keen on this approach.
http://www.autopano.net/forum/p32400-2008-11-11-19-04-57#p32400
Last edited by mediavets on Tue Nov 18, 2008 11:58 am, edited 1 time in total.
Andrew Stephens
Many different Nodal Ninja and Agnos pano heads. Merlin/Panogear mount with Papywizard on Nokia Internet tablets.
Nikon D5100 and D40, Sigma 8mm f3.5 FE, Nikon 10.5mm FE, 35mm, 50mm, 18-55mm, 70-210mm. Promote control.

User avatar
claudevh
Moderator
 
Topic author
Posts: 1349
Likes: 0 post
Liked in: 0 post
Joined: Sun Nov 25, 2007 11:12 pm
Location: Mont-Saint-André (Belgium)
Info

by claudevh » Tue Nov 18, 2008 12:07 pm

Hi all,

Sorry but I thing that the Canon 5 D could be use without modification of the Merlin Head, see post of Trekker 317 hereafter:
http://www.autopano.net/forum/p19302-2008-01-03-20-10-51#p19302 and the explanations of the different dimensions hereafter:
http://www.autopano.net/forum/showimage.php?pid=19281&filename=Cotes++des+bo%C3%AEtiers.jpg

If necessary, you could modify the Merlin head according the following rules:
1. Orininaly the head without modification allow the usage of all camera's wtih "A measure" of maximum 40 mm
2. A further mm's will be gained by separating the vertical and the horizontal part of the head:
40 + 10 = 50 mm "A measure" maximum with simple separation according the next post:
http://www.autopano.net/forum/p32400-2008-11-11-19-04-57#p32400
3. Other furter increasements could be realized according the Wiki at the next URL:
http://www.autopano.fr/wiki/action/view/T%C3%AAte_astronomique_Multi-fonctions_Merlin_Adaptation_M%C3%A9canique#Modification_de_l.27.C3.A9querre_de_fixation

Frederic, is that possible to adapt this part of the Wiki ?

Many other stuff could be updated like the summaries in English and the traduction in French made by Mediavets

Who can do that and how ?

:cool:
:cool: Claude :cool:
Merlin + Papywizard on Windows 7 & Nokia 770 § N810 & Acer (Netbook) + PanoramaApp Androïd + Deltawave PapyMerlin BT + Autopano
Spherical Pano (180 x 360) with Canon 40D + Canon EF-S 10-22mm f/3.5-4.5 Zoom & Pôle Pano with Canon 5D MK2 and shaved Tokina 10-17 3.5-4.5 AF DX Fisheye
Gigapixel photography with Nikon D200 + Sigma 70-200 F 2.8 EX DG APO HSM

User avatar
fma38
Moderator
 
Posts: 5850
Likes: 2 posts
Liked in: 2 posts
Joined: Wed Dec 07, 2005 6:21 pm
Location: Grenoble, France
Info

by fma38 » Tue Nov 18, 2008 12:18 pm

The main problem of the Merlin is not the camera body, but the lens body. If you are using big lenses, like Canon 17-40/f4 L, you can't adjust it to its NPP, as the diameter is too large...

Claude, no problem to fill the wiki pages, but I don't have time to do that... They should also be translated in english...
Frédéric

no avatar
mediavets
Moderator
 
Posts: 16415
Likes: 2 posts
Liked in: 130 posts
Joined: Wed Nov 14, 2007 2:12 pm
Location: Isleham, Cambridgeshire, UK.
Info

by mediavets » Tue Nov 18, 2008 12:23 pm

claudevh wrote:Hi all,

Sorry but I think that the Canon 5 D could be use without modification of the Merlin Head, see post of Trekker 317 hereafter:
http://www.autopano.net/forum/p19302-2008-01-03-20-10-51#p19302 and the explanations of the different dimensions hereafter:
http://www.autopano.net/forum/showimage.php?pid=19281&filename=Cotes++des+bo%C3%AEtiers.jpg
cool:

Claude and Frank,
It appears that I am mistaken - the Canon 5D is smaller in that dimension that I had imagined - I should have checked the size of the Canon 5D body before posting. My apologies.

It seems that it is possible to get the Canon 5D (the body at least) very close to the NPP if mounted in portrait orientation without modifying the dovetail-clamp crown. As Frederic pointed out, it will depend to some extent on the diameter of the 'barrel' of the lens you are using as much as the size of the camera body.

I think these pictures of Klaus' setup show a 5D on the Merlin?:
http://www.autopano.net/forum/p30829-2008-10-15-21-55-37#p30829

My small D40 body fits fine, using the standard dovetail-clamp, with the standard 18-55mm kit zoom and the Nikkor 10.5mm FE, but it's a very tight fit using the Sigma 8mm f3.5, and any lens with a bigger barrel would be a no-no. And, I can get a +90 degrees zenith shot with the Nikkor 10.5mm FE and Sigma 8mm f3.5 FE on the D40 using the Merlin but this is not possible with many larger/longer body/lens combinations.

You may still need/wish to modify (reduce the size of) the large knob on the camera screw on the standard dovetail bar to maximise vertical rotation.
http://www.autopano.net/forum/p31985-2008-11-04-16-52-52#p31985
http://www.autopano.net/forum/p31499-2008-10-28-16-22-09#p31499
http://www.autopano.net/forum/p31502-2008-10-28-16-34-39#p31502
Last edited by mediavets on Tue Nov 18, 2008 6:06 pm, edited 1 time in total.
Andrew Stephens
Many different Nodal Ninja and Agnos pano heads. Merlin/Panogear mount with Papywizard on Nokia Internet tablets.
Nikon D5100 and D40, Sigma 8mm f3.5 FE, Nikon 10.5mm FE, 35mm, 50mm, 18-55mm, 70-210mm. Promote control.

User avatar
Paul
Member
 
Posts: 778
Likes: 0 post
Liked in: 0 post
Joined: Sat Aug 30, 2008 4:46 pm
Location: Bonn, Germany
Info

by Paul » Tue Nov 18, 2008 2:17 pm

so, here the first answer from Baader regarding their universal clamp:

EDIT:
base top diameter: 68,88mm <--- faced to rail, outer side
base bottom diameter: 59,93mm <--- faced to clutch, inner side, red adhesive material
height of base + clamp: 41,9mm

they don't know if thats fit a Merlin

more will follow here ...

EDIT:
they will deliver the baseplate only, it is sold separat at 45.- €
more dimensions I will get tomorrow (inner hole)


Last edited by Paul on Tue Nov 18, 2008 7:11 pm, edited 1 time in total.
Paul

close, but no cigar ... ... ...

no avatar
mediavets
Moderator
 
Posts: 16415
Likes: 2 posts
Liked in: 130 posts
Joined: Wed Nov 14, 2007 2:12 pm
Location: Isleham, Cambridgeshire, UK.
Info

by mediavets » Tue Nov 18, 2008 2:29 pm

Paul,

None of those dimensions seems to be a close match for Thierry's drawings of a replacement crown for Merlin:
http://www.autopano.net/forum/postgallery.php?pid=30835&filename=crown_merlin_mod_thierry.jpg

It would be great if their current part had happened to be the correct size for Merlin. But that doesn't matter really. If they are set up to make a rather similar part they could perhaps make one especially for Merlin without too much trouble.

Good luck with your further investigation.

I think we may only need a part like the element they label 'Montageplatt'? But maybe with some more threaded holes it it to enable mounting of a camera-specific 'arm'/rail.
http://www.autopano.net/forum/postgallery.php?pid=32660&filename=Baader+universalklemme.jpg

Or maybe people would like the dovetail clamp element too?
Last edited by mediavets on Tue Nov 18, 2008 3:04 pm, edited 1 time in total.
Andrew Stephens
Many different Nodal Ninja and Agnos pano heads. Merlin/Panogear mount with Papywizard on Nokia Internet tablets.
Nikon D5100 and D40, Sigma 8mm f3.5 FE, Nikon 10.5mm FE, 35mm, 50mm, 18-55mm, 70-210mm. Promote control.

User avatar
fma38
Moderator
 
Posts: 5850
Likes: 2 posts
Liked in: 2 posts
Joined: Wed Dec 07, 2005 6:21 pm
Location: Grenoble, France
Info

by fma38 » Tue Nov 18, 2008 2:29 pm

Frédéric

User avatar
Paul
Member
 
Posts: 778
Likes: 0 post
Liked in: 0 post
Joined: Sat Aug 30, 2008 4:46 pm
Location: Bonn, Germany
Info

by Paul » Tue Nov 18, 2008 3:11 pm

if that lathe/mill-story of Tom ends up lucky, we will produce adapter plates in three or four weeks

his lathe went back to the seller for repair/fix
Paul

close, but no cigar ... ... ...

User avatar
claudevh
Moderator
 
Topic author
Posts: 1349
Likes: 0 post
Liked in: 0 post
Joined: Sun Nov 25, 2007 11:12 pm
Location: Mont-Saint-André (Belgium)
Info

by claudevh » Tue Nov 18, 2008 5:05 pm

Frederic,

I am for sure not saying that "you should do that yourselve" !

How can "we" do for publishing in the Wiki ?

Can we prepare the docs, submit to you for "imprimatur" and do you post in the Wiki yourselve or can we do that ourselve ?

This is only a problem of coordination of our efforts.

:)
:cool: Claude :cool:
Merlin + Papywizard on Windows 7 & Nokia 770 § N810 & Acer (Netbook) + PanoramaApp Androïd + Deltawave PapyMerlin BT + Autopano
Spherical Pano (180 x 360) with Canon 40D + Canon EF-S 10-22mm f/3.5-4.5 Zoom & Pôle Pano with Canon 5D MK2 and shaved Tokina 10-17 3.5-4.5 AF DX Fisheye
Gigapixel photography with Nikon D200 + Sigma 70-200 F 2.8 EX DG APO HSM

User avatar
fma38
Moderator
 
Posts: 5850
Likes: 2 posts
Liked in: 2 posts
Joined: Wed Dec 07, 2005 6:21 pm
Location: Grenoble, France
Info

by fma38 » Tue Nov 18, 2008 6:02 pm

If you want to edit the wiki, just create an account, and then edit the pages. This is the 'magic' of wiki ;)
Frédéric

no avatar
bigwade
Member
 
Posts: 282
Likes: 0 post
Liked in: 0 post
Joined: Tue Nov 18, 2008 12:34 am
Location: NL
Info

by bigwade » Tue Nov 18, 2008 9:11 pm

Wow !
This an active forum !

I think it's wiser to wait untill I have my unit.
Should be end of the week.
I like the Manfrotto 357 rail solution or to mount an unused upper-arm of
my NN5 beta on a smaller crown.
That would be great so that I can use the NN camerablock-mount and leave it on the camera.
Camera's to use are 5D and 450D.
For using the Merlin with the lenscollar of the 70-200 or 180mm macro I don't think there will be many problems with the "out of the box "version.
When I have time I can make detailed photo's from the new unit for other new people.
Is that an idea ?
Have Fun !

no avatar
teleskop-austria
Member
 
Posts: 25
Likes: 0 post
Liked in: 0 post
Joined: Wed Nov 19, 2008 5:52 pm
Location: Vienna
Info

by teleskop-austria » Fri Nov 28, 2008 5:39 pm

big hello dear Merlin users,

up to now we are serving the needs of astronomers, who frequently need specially designed adapters. We have an attached workshop and can provide economic solutions, hopefully :-)

The merlin is popular among astronomers as an ultraportable motorized mount for small telescopes, as you know we have it in stock. The problems for using it for pano tasks are almost clear to us, we understand what is NPP and have seen the fabulous panos at lookaround.nl - thanks bigwade for all the links!

Still I dont understand the connection between the crown, and the A value which is said to be 40mm for the Merlin. On a camera, it is the distance bottom to lens mount center. But on the Merlin? Is it the distance prism-mount to base rotation center?

We deliver the Merlin with an L-shaped photo adapter, probably you replace it by the Nodal Ninja or a similar device. What role plays the crown?

If somebody could send us a drawing of the needed crown replacement, as simple as possible (every drilling and so on adds to the price...) we are ready calculate the costs.

best regards form Austria, Tommy

no avatar
mediavets
Moderator
 
Posts: 16415
Likes: 2 posts
Liked in: 130 posts
Joined: Wed Nov 14, 2007 2:12 pm
Location: Isleham, Cambridgeshire, UK.
Info

by mediavets » Fri Nov 28, 2008 5:50 pm

Tommy,

The 'A' dimension you refer to is from the base of the camera to the centre of the lens mount as you say.

When shooting panos with the Merlin head the camera is usually attached in a vertical (rather than landscep) orientation. To achieve a correct NPP the centre of the lens mount must be aligned with the vertical axis of rotation.

The minimum 'gap' between the face of the dovetail mount and the vertical axis of rotation of the merlin mount that can be achieved with the standard 'crown' - the part of the dovetail mount Integral to the Merlin mount - is approx. 40mm.

Here's a photo of my Nikon D40 with the Nikkor 10.5mm fisheye lens fitted to a Merlin mount using part of the standard L-bracket (with the large knob removed) - it just happens that my D40, on of the smallest DSLR bodies, has an 'A' dimension of 40mm so I can achieve a correct NPP.:
http://www.autopano.net/forum/p33092-2008-11-20-20-37-45#p33092

But many camera bodies have an 'A' dimension greater than 40mm, or their lenses have barrels with a diameter of greater than 20mm - which means they cannot be located at the NPP - so we are looking to replace the part of the dovetail mount integral to the merlin mount (which we often refer to as the 'crown') with a new part that will offer a larger dimension/'gap' between the face of the new 'crown' and the vertical axis of rotation of the Merlin mount.

I hope this helps explain why we wish to replace the 'crown'?
Last edited by mediavets on Fri Nov 28, 2008 6:00 pm, edited 1 time in total.
Andrew Stephens
Many different Nodal Ninja and Agnos pano heads. Merlin/Panogear mount with Papywizard on Nokia Internet tablets.
Nikon D5100 and D40, Sigma 8mm f3.5 FE, Nikon 10.5mm FE, 35mm, 50mm, 18-55mm, 70-210mm. Promote control.

User avatar
Paul
Member
 
Posts: 778
Likes: 0 post
Liked in: 0 post
Joined: Sat Aug 30, 2008 4:46 pm
Location: Bonn, Germany
Info

by Paul » Fri Nov 28, 2008 6:39 pm

Welcome to this forum Tommy.

I just bought a Merlin from you, but when I switch it on the "Guide" button LED goes on, "Set"- and "Go"-button starts blinking.
The Merlin does nothing.

This error is not explained in the manual. Can you help me?

A drawing of a crown replacement you can see here:
http://www.autopano.fr/wiki/action/view/T%C3%AAte_astronomique_Multi-fonctions_Merlin_Adaptation_M%C3%A9canique
Image

PS: you made a typo in the link to your website, the 's' in austria is missing
Last edited by Paul on Fri Nov 28, 2008 6:40 pm, edited 1 time in total.
Paul

close, but no cigar ... ... ...

Next

Who is online

Users browsing this forum: No registered users and 2 guests