[Leica] M Lenses on GF-1

[jsmith342 at gmail.com (Jeffery Smith)]

Is the vignetting due to the light rays hitting it at less than a 
perpendicular angle? One of Olympus's big selling points on their lenses is 
that the light path is exactly parallel to the APS-sized sensor behind the 
lens.

Jeffery


On Apr 14, 2010, at 3:05 PM, David Rodgers wrote:

> I don't doubt what you're saying. I'm just a bit mystified how a lens
> can vignette on a sensor that's half the size of film that it was
> designed to cover. That hasn't been my experience with M lenses on Micro
> Four Thirds. I actually have to use Lightroom to add a little forced
> vignetting because in many cases I like that look. 
> 
> I'm also perplexed at how Contax G lenses can be materially better on
> Micro Four Thirds than are Leica M lenses, or even CV lenses for that
> matter. While I haven't used all on Micro Four Thirds I have used them
> all on film and for the most part they're all pretty good. Thus I'm
> curious as to why the performance would be so different on Micro Four
> Thirds. What kind of adapters are you using? 
> 
> The main issues I see in using Lumix lenses versus Leica M lenses on the
> GF-1 is that Lumix lenses have AF and Leica M lenses don't. It's easy to
> miss focus, particularly with the longer lenses wide open. A focus
> assist LED in the viewfinder would be a nice feature to have. 
> 
> Dave R
> 
> 
> -----Original Message-----
> From: lug-bounces+drodgers=casefarms.com at leica-users.org
> [mailto:lug-bounces+drodgers=casefarms.com at leica-users.org] On Behalf Of
> Simon Ogilvie
> Sent: Wednesday, April 14, 2010 3:03 PM
> To: lug at leica-users.org
> Subject: Re: [Leica] M Lenses on GF-1
> 
> I've used a variety of Leica and Voigtlander M lenses on a G1, and
> also a couple of Contax G lenses (45/2 and 90/2.8).  Without exception
> I found the M lenses disappointing with either smearing, vignetting or
> other faults.  The Contax G lenses however are superb on the micro 4/3
> format and I much prefer the 90 to the 90 Summicron and the 45 to my
> (now sold) 50 Summilux.
> 
> I've also been a bit disappointed with the performance of the
> Panasonic 45-200.  I haven't checked but it's possible most of the
> shots I've taken have been at or close to full aperture, so the
> vignetting at the long end is very noticeable.  It also doesn't appear
> very sharp at the long end either.  Maybe the upcoming 100-300 will be
> better - I hope so.
> 
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> 
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