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ZM Biogon 28mm midrange softness?
#1
Question 
Hello guys, 
Back after a few years of silence ! I had a lens question and I thought this could be a good place to ask.

so...

I've been the lucky owner of a Minolta CLE and its rokkor m 40mm f/2 pair for a year now and recently acquired a zeiss 28mm ZM biogon to complement my kit.
Sadly, I've shot a couple of rolls (ektar 100 and portra 400) and have found the results to be extremely soft. One great joy of that lens should be hyperfocal shooting so I set it at f/8, set the focus scale infinity mark on f/8 and thus I was supposed to get 1.5m to infinity DOF, theoretically. Light was plentiful and shutter speed high.
But... shots are awfully soft. Evenly so, so it reassured me it wasn't a knocked out element or so.

I had this idea to test it on a M10 to confirm and indeed I got results as bad as the developed CLE shots, when using the focus scale. But I could confirm I'm getting super sharp results when actually focusing on the subject, which here was in the 10 meters range or so. All this was performed at f/8.
It seems to be performing normally when set to focus on short range, wide open...it's not displaying a massive bias using the rangefinder (altough I'm aware there might be coupling issues).

So in summary :
-set to distant object : sharp, super sharp actually, center to corners
-set to close object : sharp
-When set using the focus scale, focus is between 2 and 5 meters : soft;

Is this kind of "midrange" softness something that seems likely when both short & long range are sharp ? or am I missing the focus scale use completely ? I'll probably send it for inspection to Zeiss but I'm curious about your possible experiences.

Thanks in advance,
S.
  


Messages In This Thread
ZM Biogon 28mm midrange softness? - by Sylvain - 06-04-2020, 01:36 PM
RE: ZM Biogon 28mm midrange softness? - by mst - 06-04-2020, 07:39 PM
RE: ZM Biogon 28mm midrange softness? - by mst - 06-05-2020, 01:45 PM
RE: ZM Biogon 28mm midrange softness? - by mst - 06-05-2020, 02:59 PM
RE: ZM Biogon 28mm midrange softness? - by toni-a - 06-05-2020, 07:47 AM
RE: ZM Biogon 28mm midrange softness? - by toni-a - 06-05-2020, 06:58 PM
RE: ZM Biogon 28mm midrange softness? - by mst - 06-05-2020, 08:42 PM
RE: ZM Biogon 28mm midrange softness? - by toni-a - 06-06-2020, 06:31 AM

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