Dear kind members,
I´m new into ULF and want to build my own camera. i owned a Bausch & Lomb 506mm 5.6 20 inch lens.
Can you please help me to find out if i can use it on a 16x20 camera?
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Dear kind members,
I´m new into ULF and want to build my own camera. i owned a Bausch & Lomb 506mm 5.6 20 inch lens.
Can you please help me to find out if i can use it on a 16x20 camera?
Can you post an image of the lens and an image of the lettering on the front of the lens?
Probably not.
My USAF lens data sheets are incomplete. They show one 20"/5.6 B&L lens, a very conventional telephoto lens that is around 13.5 inches long and weighs 10 pounds . It covers 35 mm (24 x 36 mm).
This may well not be the lens you're thinking about, so more information on it would be very helpful.
They also mention but give no data on other 20"/5.6 lenses including one that covers 5" x 5" and none that cover more.
The largest format that USAF regularly used was 9" x 18". Their lenses for that format were quite heavy, and 9x18 is considerably smaller than 16x20.
People have often asked about lenses for ULF here. The short answer is that there are few normal lenses for 16x20. Process lenses that cover the format are all longer than normal.
For access to my USAF datasheets and to other information about lenses that might, perhaps, do follow the link in the first post in https://www.largeformatphotography.i...mainly)-lenses
Attachment 189052Quote:
Originally Posted by Greg
A telephoto lens and not a USAF lens. Telephotos are all narrow angle lenses, it won't do what you want.
thanks a lot... now i need to sell it...Quote:
Originally Posted by Dan Fromm
Will those do their job?
Zeiss Apochromat Tessar 10/640mm
Rodenstock Apo-Ronar 600mm 24in. f/9
And then i have another small question :D
maybe it sounds dumb...
Do i really need a 5.6 lens?
i think f10 on a 16x20 could generate a DOF of a 1.4 on fullframe?
Am i right?
No and no. I gave you directions to a link that will get you nearly all of the lens catalogs etc. available on line. Use it. Its time to stop dreaming and do your own legwork.Quote:
Originally Posted by maxi0909
But why? I read that both of those lenses where used by some people for 16x20
The Zeiss was also used on a 20x25 format camera
So why do you think it will don't work?
Why did you ask here, if you read it would work? Simply trust what you "read", and buy one and see.