Lens for 20x20 or 24x24

[MCrooks]

Hmmm this is a very interesting line of thought Øyvnd & John. I'll have to do some experimenting this weekend. I'm want to put together a basic cardboard mockup that will slide inside itself so I can test the copy lenses I already have.

Dan - I talked with Reinhold and he is working on a 1000mm FL lens for another client so I'll be following that closely. I am curios about the overall sharpness. I like the soft focus look on some images but the projects I have in mind call for a sharper image.

[johnielvis]

yeah---something like this wide angle adapter would do the trick like the thing I have--when used as it's intended, you put it on the front of the lens and it reduces focal length and increases field of view---BUT if you screw this on the BACK of a lens, then it should increase the focal length and increase the coverage circle!!!! same thing just in reverse--I'm surprised the ulf guys and experimenters haven't figured this out yet..

http://www.bhphotovideo.com/c/produc...0_6X_Wide.html

[jnanian]

hey matt

reinhold makes and supplies waterhouse stops for his lenses
check out what the wollaston lenses are pretty sharp stopped down ..
maybe if/when you ask him to make the lens, you can have him make
your own personal set of stops ... like f6.8 or wideopen for soft,
and f11 or 128 or 32 for sharp
maybe he already makes custom waterhouse stops for people ..

have fun !
john

http://www.apug.org/forums/forum44/9...-meniscus.html

[craigt]

I just returned from a 4000km round trip using my van as a camera shooting 24"x32" tintypes. I was using an 890mm Apo Nikkor that has a huge image circle at portrait distances and still covers 20x24 at infinity. I paid $350 for the lens.

You can see some of the plates on my blog if you're keen

http://craigtuffin.tumblr.com/

[Bertil]

I have 3 APO-Nikkor (process) barrel lenses which, according to Nikon product information, have huge image circles (never been close to make use of it!);
APO-Nikkor f:9/360 mm, IC = 600mm
APO-Nikkor f:9/480 mm, IC = 800mm,
APO-Nikkor f:11/760mm, IC = 1170 mm.
I use them together with a Sinar (Copal) behind the lens shutter, for 4"x5" to 8"x10" film format.
I didn't pay a fortune for these lenses some years ago on eBay.
/Bertil

[Dan Fromm]

Bertil, you are much too trusting and and aren't thoughtful enough. Apo-Nikkors are narrow angle process lenses. Shorter ones (150 mm - 240 mm) just cover their focal lengths at infinity. Longer ones have less coverage.

The coverage figures you posted are for 1:1, are twice the lenses' coverage at infinity. See this: http://www.galerie-photo.com/apo-pro...ikkors-en.html .