Re: Horizon 202 Questions

[Willem-Jan Markerink <w.j.markerink@xxxxx>]

On 28 Sep 98 at 8:34, Peter Marshall wrote:

> Remember that the lens has a pretty easy job to do - unlike a normal 
> camera lens to film distance is fixed across the whole negative, and you 
> are essentially using a small strip from the centre of the lens across the 
> whole neg. Any variation across the length of the neg can't be due to 
> field curvature (though this could give a small vertical effect, uniform 
> across the neg, but I haven't been able to notice it.) So you get uniform 
> sharpness into the corner of the neg. The actual circle of coverage 
> required is only about 12mm radius rather than the 22mm needed in a fixed 
> lens 35mm camera. 

That should be about 26mm vs 43mm on a normal SLR 
( SQR (24^2 + 36^2) ) 

Btw, this makes me wonder whether anyone has used a tilt/shift lens 
(like the EOS 24mm/f3.5 TS-E) on a Super Roundshot 220VR....with 
nearly 60mm image circle (36 plus 11mm shift), this is a very nice 
candidate for extreme wide angle pan's (extreme in the vertical 
dimension, about equal to a 12mm on 35mm film (24mm film height)).
Yes, I know about the electronic aperture of the EOS lenses, but 
aperture can be preset on a true EOS body, and then fixed while 
pressing the DOF button and removing the lens (or during exposure).



--                 
Bye,

Willem-Jan Markerink


      The desire to understand 
is sometimes far less intelligent than
     the inability to understand


<w.j.markerink@xxxxx>
[note: 'a-one' & 'en-el'!]