Lubitel 75mm T-22 lens image circle for 4x5"?

[Fulvio]

Does anyone know precisely what's the image circle of a Lubitel T-22 75mm triplet lens? I know it's a medium format lens, but I was just wondering if I can get round images on 4x5" film from it or the circle is cropped on 4x5" and I need a larger format to have a perfect circle.

thanks

[walter23]

I very much doubt it would cover a full 4x5" sheet given the (presumably-tessar style) design and focal length, but you'd at least get a 6cm diameter circle on sheet film. Can't hurt to try, you can probably reversibly remove the lens (just make sure you mark the focussing gears so you can get them reattached in the right register, or you'll lose proper focus through the TLR viewfinder lens).

[Fulvio]

yes, the point is not to have a 4x5 coverage, I want a circular image on film. I don't have a Lubitel yet, so I was asking first. Thank you

[Fulvio]

a friend of mine lended me one... it appears the coverage is roughly 11x11 cm... I'd say something between 10x10 and 11x11 centimeters at infinity/full open; it will not cover 4x5" neither deliver a circular image as I was hoping. I guess one needs at least a 5x7" to obtain that effect...

I did some research on the internet... it appears that this image circle size (~100-110mm) is very frequent among medium format tessar lenses in the 75-110mm focal length range...

[infest]

Does anyone know precisely what's the image circle of a Lubitel T-22 75mm triplet lens? I know it's a medium format lens, but I was just wondering if I can get round images on 4x5" film from it or the circle is cropped on 4x5" and I need a larger format to have a perfect circle.

thanks

It doesn't cover 4x5, (be happy) but you won't get a "perfect" circle - just a circle with smudge borders.

[Tomf2468]

Put a long round lens shade on it. It will take some experiments to find just the right length, but it will give you a "mechanical" limit to the lens's coverage and form a nice circle.

[Fulvio]

Put a long round lens shade on it. It will take some experiments to find just the right length, but it will give you a "mechanical" limit to the lens's coverage and form a nice circle.

good idea.. actually I could do that with any lens, but I wanted the toy camera feeling of a cheap lens

thank you

[rwyoung]

Lens shade + Vaseline (petrolium jelly) smeared on the lens (or a filter if you don't want to clean the lens) perhaps

[jimgalli]

I have one more of the wee petzval's to sell. Here is what you can expect. The page comes up with half frame 4X5 images but if you click on the images it shows full frame 4X5 coverage. It's about 85mm and a true petzval. No aperture. Contact me off line if any interest. jimgalli at lnett dot com

[walter23]

good idea.. actually I could do that with any lens, but I wanted the toy camera feeling of a cheap lens

thank you

You may be disappointed with the nice sharpness of the lubitel lens, if you want the toy camera look. Maybe it's not a Zeiss hasselblad T* lens or anything, but it's far from a crappy lens.

I guess the areas outside of the 6x6 film area might be degraded though.