Re: Kiev fisheye (was: Re: IR spherical panorama)

[Clive Warren <Clive.Warren@xxxxxxxxxxxxxx>]

At 10:24 pm +0200 16/10/00, Marco Pauck wrote:
>
>Clive Warren wrote:
>[...]
>>  Was interested to read your comments on the Kiev 30mm W-J.  Have you
>  > tried out one of these lenses?
>
>  > Are we talking true fisheye here?  When you say "full frame" is this
>>  a circle touching the sides of the 6x6 format, or does the image
>>  cover the whole of the 6x6 format?
>
>The Arsat/Zodiak 30mm is a full-frame fisheye for 6x6 but a
>circular for 4x5".
>
>More info can be found at
>http://www.pauck.de/marco/photo/stuff/kiev_fisheye/kiev_fisheye.html
>

Marco, thanks for the URL - I popped over had a good read.  Your web 
site is looking excellent by the way. I have a few questions for you!

The edge resolution at 14lpmm is rather poor.  This would translate 
to an easily perceived loss of quality at the edges of the image. 
This may well cause stitching problems in any pano. digital 
manipulation. Am interested as to where you found the resolution 
details, or perhaps you measured the performance of the lens yourself?

Is this edge value measured for the full frame 6x6 image?

Anyway, was the resolution test carried out with wide open aperture 
or was this down a couple of stops?  With such a wide acceptance 
angle, closing the iris may cause diffraction problems anyway - 
comments?

Finally, do you know the size of the fisheye circular image on 4x5 format?

Think that about covers it - btw am currently playing around with 
6x17cm format using homemade gizmos.  More on that when I have some 
photos up somewhere...

-- 
All the best,

              Clive   http://www.cocam.co.uk
                      Photographic Services, Filters and Equipment, Infrared FAQ
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