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MF lens upon DSLR


sfage

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The usage on 35mm (or smaller formats) of lenses DESIGNED for larger formats can be considered.... of course coverage is granted, but the rules of lens design must be kept in mind, too : basically :

- Is true that, generally speaking, an area largely contained within the center of the image circle is the "best part" of the focused image

- But , historically, lenses designers DID keep in mind the enlargements to which the negative should be projected.

- And typically, they considered as acceptable, for larger negs, resolution figures (in lines-per-millimeter) well below the values we are accustomed for 35mmm film.

 

So, roughly speaking, if one uses an excellent Planar 80/100 (Hassy/Rollei/Linhof) as a moderate tele for a 35mm, he surely enjoys excellent planarity, superb chromatic correction... and maybe a sharpness a bit disappointing.

Time ago, I read a good article on the various "declinations" of the famous Biogon design (Zeiss - Ludwig Bertele) : 90° coverage... 21mm on Contax, 38mm on Hasselblad, 53mm on Linhof 6x9, 75mm on Linhof 9x12... with a resolution regularly descending from one focals to the next.

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