Old Prime or new lens for Sony A7mk3

Started Dec 20, 2018 | Questions thread
olstrup Veteran Member • Posts: 3,939
Re: Old Prime or new lens for Sony A7mk3

Chester McCheeserton wrote:

olstrup wrote:

....the 35 and 50mm type IV Summicron and Summilux which are excellent non aspherical lenses also on Sony A7X).

not to hijack the thread here, but Olstrup or Rol, wondering what either of you do when using 35 Summicron v4 on the A7r3 in terms of applying a lens profile corrections in lightroom?

I don't use LR anymore but when I did, I didn't use any lens profile and I still don't. Distortion correction of the lens is excellent (a hallmark of those older Leica lenses) so I don't find any sofware correction necessary. As for vignetting it is most pronounced wide open and diminishes as the lens is stopped down. I apply correction as needed - if needed - on an individual picture basis. It's fast - only a matter of pulling a slider.

Modern lenses designed for digital cameras often leave a lot of distortion uncorrected in order to prioritize other lens corrections. The distortions are then supposed to be corrected by software - either in camera or in PP via a lens profile. Older lenses like the Summicron 35 type IV were designed for film. Good distortion correction had to be there in the lens design because there was no PP software and computers back then. For example the second version of the Leica M Super Angulon 21mm was regarded as sensationally good because it corrected distortions better than most other super wide angle lenses at the time. It had quite a lot of vignetting, but that could be corrected in the darkroom when copying which distortions couldn't. Regrettably this fine lens can't be used on digital cameras because of the rear lens' proximity to the film/sensor (it was a variant of the symmetrical Schneider Angulon design) .

I've asked about this elsewhere, and been directed to the procedures for making my own profile via adobe raw download procedures...the directions for doing this include a 22 page pdf, that looks like a lot of work!

I like the idea of just not using a profile most of the time, I'm aware that applying one will cost a little sharpness, detail at extreme edges of the frame, etc...and I like the natural vignetting some of the time...

It's an issue though, when I'm hand holding the lens at like F4 and shooting in fog, snow, or otherwise, light even background. I'm not worried about distortion (which is prob nill anyway) but that vignetting can sometimes be distracting. Do you fellows just use the 35 cron asph profile?

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"Sharpness is a bourgeois concept." (Henri Cartier-Bresson)

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