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Hi, still learning the art of Panoramas. My question is How much variation in exposure can APP handle in auto mode with Canon raw images before some pre stitching is needed.
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irpano wrote:
[..] How much variation in exposure can APP handle in auto mode [..]
The main point is the difference in exposure between a source image and the next one(s): in a series where the variation from one shot to the next is at most 1 EV, APP should be able to care with the global variation even if it's higher than 2 EV. On the contrary when the variation between two contiguous shots is higher than 2 EV, poor results are the rule. Manual placement of one or more yellow anchor helps.
In the following example the exposure difference between the top and bottom was higher than 5 EV 
so that I see the result I got using AUTO and manual anchors placement as something encouraging...
Last edited by GURL (2008-09-10 12:05:47)
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looks like I need to read up about those anchor's and their usage too!
thanks
Henrik
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Thanks for the quick reply and thqank you to those members who are willing to hep out a new member. I hope the questions are sensible.
One more if I may,
Whe taking a panorama inside a room where the camera is 4 metres from the front subject but one element is behind the depth of field for the lense (Near = 3.39M, Far 4.87 M) Do I select a smaller apeture say f22 and accept the Long exposure times or will APP in auto mode cope with different focus
Thanks again
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johntom@actewagl.net.au wrote:
Thanks for the quick reply and thqank you to those members who are willing to hep out a new member. I hope the questions are sensible.
One more if I may,
Whe taking a panorama inside a room where the camera is 4 metres from the front subject but one element is behind the depth of field for the lense (Near = 3.39M, Far 4.87 M) Do I select a smaller apeture say f22 and accept the Long exposure times or will APP in auto mode cope with different focus
Thanks again
Hi John!
better use a small aperture and choose a focus-point between near and far. Dof increases faster at longer distance and slower at closer distances. So as a "rule of thumb" choose your focus not halfways between the closest and the remotest point but about 1/3 way nearer to the closest than to the remotest point.
Depending on the focal-lenghts of your lens f:22 gives a very good dof.
best, Klaus
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johntom@actewagl.net.au wrote:
Whe taking a panorama inside a room where the camera is 4 metres from the front subject but one element is behind the depth of field for the lense (Near = 3.39M, Far 4.87 M) Do I select a smaller apeture say f22...
You can increase DoF with smaller aperture. Several calculator on line, by example:
http://www.dofmaster.com/dofjs.html
http://www.tawbaware.com/maxlyons/calc.htm
http://www.cambridgeincolour.com/tutori … -field.htm
but at f:22, you will probably get diffraction bad effect:
http://www.cambridgeincolour.com/tutori … graphy.htm
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To some extent refocusing will be handled by autopano. The problem is in the overlap areas. Smartblend or multiblend may choose to blend in the out of focus layer rather than in focus. You can get around this by outputting layers and reblending manually in photoshop.
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