M6 TTL & Voigtlander 28mm Ultron

Is the Voigtlander 28mm Ultron lens fully compatible with my M6 TTL's light meter? Any other observations about this combination?

Sure, it will meter with any lens you can attach. Preview and check you are happy with the 28mm framelines, especially if you wear glasses, as they are very near the edge of the standard 0.72 finder. Like other medium size lenses, the Ultron will also intrude a bit into the bottom right corner of the finder. Ken Rockwell shows this in his review (take the deliberately provocative text with a large pinch of salt!): Voigtländer 28mm f/2 Ultron Review

It's fully compatible with any Leica M mount camera. I've had and tested them both. It's a very good lens which is very close to the 28mm Asph Summicron wide-open. Ironically, the Summicron shines beyond the Ultron as you close the aperture.

 

These are ~20% crops in the center.

 

Summicron @ f/2

 

Ultron @ f/2

 

Summicron @ f/8

 

Ultron @ f/8

How about compared to the 28mm F2.8 Elmarit M?

How about compared to the 28mm F2.8 Elmarit M?

If I had that lens (or ever A/B tested it) I'd be happy to oblige.

I've seen reviews of the Ulton that talk about a focus shift issue, which is easily dealt with if you're using the lens on a digital body with live view or an EVF where you can see the focus state, but a mechanical rangefinder with an optical finder makes that hard to know and impossible to see until AFTER you've taken the shot and, in the case of film, developed and printed the negatives.

 

Sounds like the Summicron is focus-shift free, or at least more so than the Ultron.

Given the price Ultron is a great lens. Granted it’s not as sexy as Leica. Leica, on the other hand, in spite of its high price, is not necessarily that much better. Ultron is s great lens for the money.