Description
*AS IS* Carl Zeiss Jena Tessar p = 19 cm f/3.5 with NO.5 Universal for 8x10 The shutter is lazy
The Carl Zeiss Jena Tessar 19cm (190mm) f/3.5 is a large format lens, often found in a barrel mount (meaning it doesn't have an integrated shutter). This means it's usually used on cameras with a focal plane shutter or with an external shutter.
However, using a 19cm Tessar f/3.5 specifically for 8x10 format presents some limitations:
Coverage: Tessar lenses typically have a narrower angle of coverage (around 57 degrees for the f/3.5 and f/4.5 series) compared to lenses designed specifically for larger formats. While a 19cm Tessar might cover 8x10, it will likely be tight, particularly at infinity focus and with minimal room for movements.
Sharpness at f/3.5: While the f/3.5 aperture provides a bright image for focusing, Tessars are generally not at their sharpest wide open. Optimal sharpness is achieved at smaller apertures like f/8 or f/11.
Focus Shift: Some Tessars, particularly pre-WWII models, may exhibit focus shift, meaning the point of best focus can change when stopping down from the wide-open aperture.
