Regarding the Sigma 10mm fisheye lens. It's a relatively recent lens and there do not seem to be many pano photographers using it.
Nikon DX users seem to peer the Nikkor 10.5mm Fisheye and canon crop-sesnor users who want a lens of that type seem to go for the Tokina 10-17mm zoom fisheye.
I've read that the Sigma 10mm fisheye is more prone to chromatic aberration.
I see also proneness to CA, but I think every lens has it, it have to be dealed in post. I found some tests here: http://www.360precision.com/360/index.cfm?precision=products.camlensinfolist
I read somewhere, that Tokina 10-17mm (http://www.tokinalens.com/products/tokina/atx107afdx-a.html
) has more CA, then the Sigma 10mm, because of the zoom capability. I hadn't get tests about this, so what is the truth, I don't know...
What I know is that the Sigma 10mm is faster, then the Tokina 10-17mm, the Tokina has zoom capability, so I could use it as UWA lens too. About the sharpness I hadn't see comperisions at the same focal lenght. The Tokina could be used on FF body too, but I don't plan to get FF body in the near future.
How do prices of the Sigma 8mm f3.5, Sigma 10mm and Tokina 10-17mm fisheye compare for you?
If I get the Sigma 8mm as ground, then the Sigma 10mm costs 17% less and the Tokina 10-17mm costs 15% less.
Both of the 'fullframe' fisheye lens - the Sigma 10mm and Tokina 10-17mm - produce an image with a diagonal FOV of about 167 degrees on a cropped sensor Canon I believe. You need a min. of 6-around plus zenith and optional nadir to cover 360x180 with these lenses.
Yepp I count with 6 + 1 + 1 too, but Sigma 10mm (http://www.sigmaphoto.com/shop/10mm-f28-ex-dc-hsm-fisheye-sigma
) is for APS-C only not?
Of course both of these lenes will produce a higher resolution pano image then the Sigma 8mm f3.5.
Yes, thanks. I saw it at the 360precision.com.
Here are some images relating to the test shoot using the Sigma 8mm on my D40 with the Merlin.
1. Sigma 8mm f3.5 mounted on Nikon D40 on Merlin. It's a fairly tight fit laterally.
2. An image shot with the above at zero pitch showing parts of the mount in the frame.
3. Panorama Editor screnshot showing 'ghosts' of those bits of the dovetail clamp that appear in the images.
4. Stitched and rendered pano image which shows that the APP/APG anti-ghost has removed any sign of the dovetail clamp.
Many thanks for the test!!! You are in time, I cancelled my order without any trouble.
You saved me much time (get the stuff, send back the stuff, etc.), many thanks again!!
I have to decide between Sigma 10mm or Tokina 10-17mm for Canon 550D/T2i (crop 1,6).
I think/hope, that this discussion will be helpfull for others too! Much respect for your help, mediavets!