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View Full Version : Kowa Graphic 240mm f9 Coverage in Barrel??



PHOTOTONE
04-29-2007, 09:34 PM
I have a Kowa Graphic (Computar) 240mm lens on trial, It is in barrel mount. I have mounted it on a lensboard where the rear element penetrates the lensboard and is flush with the rear of the lensboard. A Packard shutter is mounted flush up to the rear, so it basically touches the metal rim of the rear of the lens. I am getting vignetting on 11x14 focused at infinity at f64. I was wondering if this lens only covers 11x14 when mounted in a shutter? Any advice? It IS supposed to cover 11x14 isn't it?

jonw
04-29-2007, 10:30 PM
I do believe it does cover 11x14. Here is a link on ULF coverage which is a very interesting read. http://www.largeformatphotography.info/forum/showthread.php?t=10255
I have the 240mm Graphic Kowa f9 and a 305 Graphic Kowa f9. If your barrel lens will freely unscrew out of the barrel, especially the rear lens, then it should be a direct fit in a copal 3s shutter. Mine directly fit into a copal 3s shutter. I also have a 270mm Graphic Kowa, but the rear cell will not come out with norma pressure....thus, it is staying there.
Hope this helps. BTW, I truly love my 240mm Graphic Kowa.....even more than my 240mm Germinar. Jon

TML74
05-03-2007, 12:48 PM
Hello, I have a kowa graphic 240 mm in barrel mount. It is mounted on a sinar shutter which is mounted on a Korona 7x17". The lens I have covers with no problem, but I have read that there are different kind of Kowa Graphic ?...
I also had problem at the biginning because my lens was to far from the edge of the front element of my Korona. The image circle was hidden by the edge and I had 1 inch that missed on the left and the right side of the screen... Now after some modifications every thing work fine and I will be abble to take my first pictures with all the image on the screen ! I hope I am clear as my english is not so good...

Thierry M.L.