Archive 2007 · Field of View of Zenitar 16mm after defishing?

Daniel Goller
Offline
• • •
Upload & Sell: Off

p.1 #1 · p.1 #1 · Field of View of Zenitar 16mm after defishing?

Are there formulas that could be used to compare the defished diagonal fisheye Field of View with that of a rectilinear lens?
I don't mean to get a mm answer, more to find out what the angle is, i think the Zenitar is listed as having a 180 deg field of view, once defished, what angle would that just about equal?

Thanks,

Daniel

Jul 17, 2007 at 12:55 AM

fourfa
Offline
• • • •
Upload & Sell: Off

p.1 #2 · p.1 #2 · Field of View of Zenitar 16mm after defishing?

depends on the defish software and the camera you attach it to. have a look at

http://www.kenrockwell.com/tech/dxo/optics-pro.htm

for some examples using DXO to defish a Canon 15mm. Defished and cropped to 2:3, it's similar to 12mm rectilinear on FF. Using DXO's "max image" mode which converts to a 1:2 panoramic, it's something like a fictional 7mm rectilinear lens.

diagonal angle of view, don't know offhand but shouldn't be hard to work out the math

Jul 17, 2007 at 01:45 PM

Daniel Goller
Offline
• • •
Upload & Sell: Off

p.1 #3 · p.1 #3 · Field of View of Zenitar 16mm after defishing?

If it comes out to something like a 19mm on FF (after factoring in the crop) then it would be fine, and i guess it lands somewhere in that area
supposed to replace my Tokina 19-35 i have for the EOS-3.
I'll go ahead and get the Zenitar when i get the 30D and should be happy.
Then i just need to subscribe to B&S to sell my EOS-3 + 50/1.8 + Tokina 19-35 to finance the 60/2.8.

Thanks, looks like things are working out.

Jul 17, 2007 at 04:16 PM

fourfa
Offline
• • • •
Upload & Sell: Off

p.1 #4 · p.1 #4 · Field of View of Zenitar 16mm after defishing?

trying to decode your reply... I'm guessing you want something like a 19mmFF FOV using a 1.6x crop camera? If so it's even easier. With 1.6x the need for defishing is not so extreme - some people use it very successfully without defishing at all. Most likely you'll find the $30 Fisheye-Hemi plug in do work just great and yield on 1.6x something similar to a 18mm lens on FF. all this is explained very clearly in the link in my first post.

Jul 17, 2007 at 05:09 PM

Daniel Goller
Offline
• • •
Upload & Sell: Off

p.1 #5 · p.1 #5 · Field of View of Zenitar 16mm after defishing?

It's what makes it even more interesting, i can leave it as is on the crop body, or defish, i'll check my Paint Shop Pro XI's defishing, if not i can evaluate rectfish, DxO (i like the panoramic feature of it) and Fisheye-Hemi and pick the best of them.

Thanks for the links.

Jul 19, 2007 at 09:34 PM

fourfa
Offline
• • • •
Upload & Sell: Off

p.1 #6 · p.1 #6 · Field of View of Zenitar 16mm after defishing?

unfortunately the defish module is disabled in the demo version of DXO. very frustrating.

Jul 19, 2007 at 11:52 PM

hubsand
Offline
• • • •
Upload & Sell: Off

p.1 #7 · p.1 #7 · Field of View of Zenitar 16mm after defishing?

I was suckered into thinking that DxO would be useful for this kind of thing – and it is, as long as you're using a lens on their list, and you use their second-rate RAW processing engine. If you don't use a Canon or Sigma lens, you're scuppered. If you use C1 in the workflow, you're scuppered also. You can still use their excellent tonal correction tools, but crucially not CA or geometry correction.

I've been playing with Image Align and the Zeiss 16mm fisheye here . . .

The lens is outstanding, but it takes a while to optimise the best settings for the de-fish. Essentially you optimise the image for either maximum FOV, or maximum quality; the two are mutually exclusive.

Jul 20, 2007 at 03:22 AM

atsi
Offline
• •
Upload & Sell: Off

p.1 #8 · p.1 #8 · Field of View of Zenitar 16mm after defishing?

I made an exact comparison between other lenses and my Zenitar 16mm when looking for a wider angle. The results can be found here:
http://www.lightages.ca/forums/viewtopic.php?t=210

For de-fishing, I use PTLens:
http://epaperpress.com/ptlens/

It works very well and has the Zenitar 16 in its data base.

There are times when fisheye looks better than the distorted look wide rectilinear can have, so I still have and use the Zenitar as just a fisheye.

Jul 20, 2007 at 03:31 AM


FM Forums \| Leica & Alternative Gear \| Join Upload & Sell

This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.