Re: Simonturnpike ford

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

On 15 Feb 99 at 9:32, Simon Nathan wrote:

> dear gene-since you already have screw mount pentax 17mm lens, or did
> they later make it k-mount?, look around for the screw mount 15 well
> corrected, straight lines
> 15mm. it came two ways. first version has aspheric construction. then
> then cheapened it without lowering the price. look at 35mm  fish eye for
> pentax 6x7 as a lens you can take a slice from the middle. years ago an
> independent japanese lens mfg made drawings for fisheye to cover full
> panel 4x5 but felt there was little market. 

On the PhotoKina 1996, I saw a huge ISCO fisheye lens....think I 
posted about that one on the list....relatively long focal length, 
which implied a strange large format application....don't think it 
was ment as a cinema/projector lens (although I have seen bizar large 
projector systems on last years Kina....units that used spools with 
10" or taller film, like a giant continuous overhead 
projector....also requiring a fork-lift to drag it around....8-))

Oh btw, my Mamiya 37mm fisheye and Speed Graphic 4x5" finally 
met....for the record: image circle is 92mm (at f16, no aperture-variation 
checks yet....seems most fisheyes increase image circle when stopping 
down, but some (Sigma 8mm) go the other way....note though that 92mm 
is only 2mm larger than the theoretical coverage of a 56x70mm 
frame (original RB)).
Now I only need to take a deep breath and cut off the 4 ears on the 
lens....8-))
 

--                 
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'!]