About new Summicron 35mm F2 Asph‏ on M8

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I am afraid so yes, coz the focus ring can be rotated to far left beyond the 0.7M minimum distance, more like 0.45m or something like that, also the aperture ring can be rotated to the left beyond F2 as well, so I assume it's the lens.

Thank you Wilfredo!

 

On my chrome 35 ASPH that works well you can rotate the focus to about 0.45m and the aperture ring to a bit less than the f2 stop. The aperture blades do open up slightly more after f2. I don't think that's any indication of a problem with the lens.

 

Unfortunately adjusting the camera range finder isn't a simple procedure - in spite of what people may tell you. There are at least two interdependent adjustments a gain setting and an offset. The ideal way for the system to be set up is for the camera to be adjusted within tolerance with a reference lens whose characteristics are known. Similarly the lenses should be set up independently of your particular camera to within a known tolerance. Camera and lens tolerances can either cancel one another or be additive. Both camera and one or more lenses can be out of tolerance but work well together. It's not until you try another lens you find a problem, although the more lenses your camera is OK with the more likely it is that the lens which won't focus has the problem.

 

Unfortunately I suspect Andy's advice will turn out to be the best - I'm not sure if there are independent service agents in the UK who can handle the digital Ms and ASPH lenses.

 

I was going to suggest asking the shop if you could try another lens but since you've adjusted the camera all bets are off .

 

Bob.

[LotharZhou]

Thanks very much indeed, looks like taking the lens back to the shop is the best bet now since it's only 1 week old.

 

On my chrome 35 ASPH that works well you can rotate the focus to about 0.45m and the aperture ring to a bit less than the f2 stop. The aperture blades do open up slightly more after f2. I don't think that's any indication of a problem with the lens.

 

Unfortunately adjusting the camera range finder isn't a simple procedure - in spite of what people may tell you. There are at least two interdependent adjustments a gain setting and an offset. The ideal way for the system to be set up is for the camera to be adjusted within tolerance with a reference lens whose characteristics are known. Similarly the lenses should be set up independently of your particular camera to within a known tolerance. Camera and lens tolerances can either cancel one another or be additive. Both camera and one or more lenses can be out of tolerance but work well together. It's not until you try another lens you find a problem, although the more lenses your camera is OK with the more likely it is that the lens which won't focus has the problem.

 

Unfortunately I suspect Andy's advice will turn out to be the best - I'm not sure if there are independent service agents in the UK who can handle the digital Ms and ASPH lenses.

 

I was going to suggest asking the shop if you could try another lens but since you've adjusted the camera all bets are off .

 

Bob.

[dpattinson]

Thanks very much indeed, looks like taking the lens back to the shop is the best bet now since it's only 1 week old.

 

If I were you, I would first test the set of lenses using something like a sheet of newspaper pinned to a wall. Focus on a particular line from a reasonable distance (say 2m) with the lens at maximum aperture, and see where the focus falls in the resulting image.

 

It is apparently quite possible to never notice back-focus on the M8, this has become apparent to me after testing a reasonable number of second-hand M8's, the majority of which were back-focusing and presumably had been used quite happily by their prior owners. In fact I've only ever found one second-hand M8 that focused my 50 1.4 asph correctly, and this is a lens that has been adjusted in Solms for accurate focusing (this includes my own M8 which had to be sent back to the factory to be adjusted).

 

By all means take the lens back, but just because you haven't noticed a problem with your other lenses before, doesn't mean that you can exclude the camera as root cause - particularly if you regularly stop down your lenses.

 

David.