Lens for 14X36" film camera?

[Tin Can]

Any suggestions?

[Oslolens]

At what enlargement or at infinity?
What aperture, f16, f45 or for wet plate so you need f4.5?
Most Tessar from 850mm will cover the 981mm diagonal.

Are meniscus or achromatic lenses out of the question?
Could a 1400mm Leitz Elpro 4 close-up lens in a Copal #3S max aperture f32 be good enough? Or a 820mm Pentax S82 mounted to an Ilex #5 max aperture f12.5?

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[Tin Can]

There was a person in CA that made one some years ago, film X-Ray 14X36" same as I plan

I thought I saw his yesterday on youtube and now not, I will look again

I will be shooting a small town, maybe 200 ft most of the time, across a street shorefront, and a Historical Village

I have a Jena 900mm and a Meniscus 790mm

They will work, but maybe I can shoot a NIKON 610mm that close

I actually prefer Pictorial SF

Here he is! https://www.popsci.com/diy/article/2...t-big-picture/

[Tin Can]

I use those 3 lenses and a 500mm Tessar on my 72" bellows Deardorff 11X14 Studio box, it is not portable

Idea 99, use a very good Calumet bellows with fittings, bolt that to a rear box, that will reduce box and bellows

For now it will be a one shot wonder, load film in DR

Practice in my yard, the into the wild...

[xkaes]

It seems like your options are either lenses designed for this -- hard to find and/or hard to afford -- or make your own out of "close-up lenses". The DIY approach is pretty cheap, and the results will depend on the quality of the glass you start with. 77mm CU lenses, for example, will give you a wide aperture at any focal length. You can use smaller lenses and/or add a diaphragm of whatever size is appropriate. You should be able to get pretty good results with low diopter optics.

http://fuzzcraft.com/achromats.html

[Tin Can]

Thank you

I bought a set of 95mm close up diopters years ago, never tried them

At 3 am today I was searching for a second set

Found only 77mm at a low price

I need to test these

soon...

It seems like your options are either lenses designed for this -- hard to find and/or hard to afford -- or make your own out of "close-up lenses". The DIY approach is pretty cheap, and the results will depend on the quality of the glass you start with. 77mm CU lenses, for example, will give you a wide aperture at any focal length. You can use smaller lenses and/or add a diaphragm of whatever size is appropriate. You should be able to get pretty good results with low diopter optics.

http://fuzzcraft.com/achromats.html

[xkaes]

You might get some ideas on simple lens design at:

https://antiquecameras.net/antiquele...cuslenses.html

And for some reason, there are a ton of 138mm CU lenses on EBAY -- not cheap, however:

https://www.ebay.com/sch/i.html?_fro...&_osacat=78997

Whatever happened to "Supply & Demand"?

[Tin Can]

I see those 138mm at big $$!

Nope

But just bought a second NOS Vivitar 77 Diopter set for $27 delivered

Maybe I cut my film in 1/2 and make 14X17 which is way easier

[pvan93]

Tampon use to make a 0.5 Doppler for their 28-200 zoom. 72mm dia.
Another idea would be to use a planoconvex lens behind your primary lens. Kodak used them in some of their zoom copiers.
Last idea. Get an old Buel Zoomer. Have not found any info on them. Believe they were used to adjust thefocial length on non zoom lens slide projectors.

[Greg]

Leitz Elpro 4 close-up lens in a Copal #3S max aperture f32

I currently use a Leitz ELPRO VIa CU lens mounted in a Copal shutter on my 11x14. Sweet spot for me is to use ND filters to shoot 1/2 of the exposure (not total exposure time) with the lens "wide open" and the other 50% of the total exposure with the iris stopped all the way down. It is possible to move the iris during the exposure without movement by using the soft end of a Q-tip. Using one's finger almost always causes movement. I also take the precaution of taping down the lens board with Gaffer's tape. Calculating both the correct exposure times was initially my Achilles Heel, but after sitting down and creating an exposure table for both of the exposures I have been getting consistent results.