210mm f/9 Graphic Kowa - Image Circle
Greetings,
I know there are at least two varieties of the Graphic Kowa 210mm f/9 lens... 4/4 element 4/6 element versions. Does anyone know the usable image circle of one or the other? By "usable" I mean very high quality.
Thank You!!
--- Also posted on the APUG.org forum.
Re: 210mm f/9 Graphic Kowa - Image Circle
I'm unaware of a 4 element K Graphic but very aware of the 6 element which was also the f 9.0 Computar and they cover 80 degrees, your 210 should easily cover 8x10.
Lynn
Re: 210mm f/9 Graphic Kowa - Image Circle
Thank you, Lynn. I removed the front/rear cells and viewed the reflections and saw 4/4. However, I didn't think about how many cells may be cemented... I'm getting very forgetful these days. Is there a way to see the optical construction without having to remove the elements from the cells? I no longer trust my hands to not damage the glass.
Re: 210mm f/9 Graphic Kowa - Image Circle
Have you seen this old thread? May be of help...
http://www.largeformatphotography.in...d-ULF-coverage
I think my Kowa 210mm is a fantastic lens. Seems to cover 8x10 very well and sharp. Quite a bargain I think. I can't offer much beyond that though.
Re: 210mm f/9 Graphic Kowa - Image Circle
Thank you, Zaitz. I did see that thread. However, I've read other threads and web pages that state a 210mm Computar doesn't always equal a 210mm Graphic Kowa and not all 210mm Graphic Kowas are the same. I'm trying to clear up my confusion which ain't easy at my age.
Re: 210mm f/9 Graphic Kowa - Image Circle
Yeah I've wondered that too, especially after reading that thread. I do know, so far, I haven't seen any real vignetting with my Kowa on 8x10. Someone buy me a Chamonix 12x20 and I'll test it on that :D.
Re: 210mm f/9 Graphic Kowa - Image Circle
Hey Zaitz... How's the corner resolution with yours? I'm embarrassed to tell you that I have yet to test mine.
Re: 210mm f/9 Graphic Kowa - Image Circle
I haven't run any formal tests either but I do have a few scanned photos that should tell me. I'll have to check when I get off work. I didn't see anything while processing that would make me think the corners were anything but sharp.
Re: 210mm f/9 Graphic Kowa - Image Circle
Re: 210mm f/9 Graphic Kowa - Image Circle
Mine was a 6/6 construction with a usable image circle in the 380mm range. It was definitely not the same as my 210mm f9 Computar that was a 6/4 plasmat that covered about 425mm.
Kerry