[Leica] IMG: 250 Telyt and Sharpness

[jhnichols at lighttube.net (Jim Nichols)]

Hi Doug,

You are correct, I need to get closer.  And, my subjects are much smaller 
than your usual targets.  I also know that smaller apertures improve my 
likelihood of having the subject in proper focus, so, as you said, many 
things may contribute to my conclusion.  I'm certainly not blaming the lens, 
which, though long in the tooth, is certainly adequate for what I do. 
However, though I don't have lens diagrams, I suspect that the design of the 
250/4 is quite different from the latest lenses, and even from your longer 
lenses.  From what I have read, in many older lenses, it is not unusual for 
maximum sharpness to fall one or two stops below wide open.

Thanks for your comments, and suggestions.

Jim Nichols
Tullahoma, TN USA
----- Original Message ----- 
From: <wildlightphoto at earthlink.net>
To: <lug at leica-users.org>
Sent: Wednesday, March 02, 2011 4:16 PM
Subject: Re: [Leica] IMG: 250 Telyt and Sharpness


> Jim Nichols wrote:
>
>>>>
> I have looked at the images from the last couple of days, to see if I can
> detect a difference in sharpness with the Telyt at three apertures, f/4.0,
> f/6.3, and f/8.0.  Admittedly, the subjects change from time to time, so
> that may have an influence.  I will provide links below, in case anyone
> would like to provide an input.
> <<<
>
> I won't be able to look at the photos until this evening (the LUG gallery
> is blocked at my present location) but with subjects such as small birds
> there are a lot of variables involved that go into image sharpness.  It 
> may
> be that you'll get the best sharpness at medium apertures but there are 
> too
> many factors involved to say that it's due to the lens.
>
> i.e.:
>
> monopod steadiness
> subject motion
> shutter speed
> focussing accuracy
>
> combine all these with your existing technique and you may find an optimum
> but you might find a better optimum if you can improve one or several of
> these factors by refining your technique.  First is get closer so you 
> don't
> have to crop.
>
> Doug Herr
> Birdman of Sacramento
> http://www.wildlightphoto.com
>
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