Coding M lens necessary on M9

[dave massolo]

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I have 3 current M lens that are not coded. 35mmf2ASPH, 50mm1.4 Summilux ASPH, and 90mmf2 SummicronASPH . Other than the convience of coding each lens .Is there any optical advantage when using them on a M9?

 

Thanks in advance

[lars_bergquist]

I would say that coding the 35mm is pretty well an optical necessity, because it computes vignetting, 'rededge' and seemingly also other problems away. This is less the case with the 50mm, and definitely not the case with the 90mm.

 

It is all a matter of the position of the exit pupil of the lens. The further back it is, the greater the need for corrections. I have used a 16mm fisheye lens on the M9 with good success. But that is a SLR lens, and a long Novoflex adapter sits between it and the camera. So the exit pupil is actually pretty far forward.

 

The rest is more a question of convenience. I had my old 50mm Summilux ASPH coded, but not my 90mm Elmarit. All wide angle lenses are coded as a matter of course.

 

The old man from the age when only spies used codes ...

[euston]

As far as I know, there is no optical advantage in having the lens physically coded compared with setting the coding manually in the camera. Using camera settings in the M9 menu makes the same vignetting &c corrections as hard coding would.

 

I’ve made user profiles for my two uncoded lenses with their codings set manually, which, I find, minimises the inconvenience of not having them hard coded.

[lars_bergquist]

You will soon discover what happens when you change lenses and forget changing the lens menu setting. The menu is OK for experiments and occasional use (very occasional) but not for lenses you use regularly. So my advice is to bite the bullet and have your shorter lenses coded. One thing less to remember is one less cause of aggravation.

 

The old man from the Age Before Bar Codes

[John Black]

I agree with Lars. I had a couple uncoded lenses, and invariably I'd switch lenses and forget to change the setting to the new lens or back to auto. All me lenses are coded now, and it just makes life alittle easier.

[russell]

I agree with Lars. I had a couple uncoded lenses, and invariably I'd switch lenses and forget to change the setting to the new lens or back to auto. All me lenses are coded now, and it just makes life alittle easier.

 

Same for me. Everything's coded. Forgot to change the menu too many times. Yes, even my 90s.