My first ME Super, bought new, had inaccurate focussing which I originally
attributed to softness of its only lens, an A35-70/3.5~4.5. My next couple
of lenses were teles which have more tolerance to focussing errors (short
depth of field but long depth of focus) so the problem remained
unrecognised. Another couple of cameras (second hand) didn't reveal the
problem either. They were better but not by enough to convince me that the
zoom was sharp.
Then I got an M24-35/3.5 and the fertilizer hit the ventilator. Nothing I
focussed sharply in the viewfinder was sharp on film, but infinity was good
if I wound the focus ring all the way. But when I focussed infinity
visually (on the screen, that is) the focus ring was a degree or two short
of the infinity mark and the shots weren't sharp. It slowly occured to me
that the focussing screen was misaligned.
The short conclusion to a long story was that I realigned the screens on all
my Pentaxes (3 screws under the screen and not a task to be approached
casually) and from that time forward all of my lenses have been as sharp as
their designers intended, even the 35-70 (and even the much hated A35/2.8)
Regards,
Anthony Farr
----- Original Message -----
From: "Alan Chan" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Thursday, 26 July 2001 6:25 AM
Subject: Re: Bokeh examples of FA 77/1.9 Ltd. and FA* 85/1.4
> >I didn't like it for the longest time. I still find it a very poor
> >performer wide open...but I think that my old ME Super had a focus
> >accuracy problem. Once I picked up my LX and put that 28 on it, the
> >sharpness of the images that lens produced seemed to increase. Poking
> >around on the net, I read that focus accuracy problems (like the ground
> >glass being slightly out of position) would display themselves most
> >obviously with the use of wide angle lenses, leading me to blame my
> >beloved ol' ME Super.
>
> I don't know if your ME Super was bought used. I have discovered many used
> SLR bodies on the market had focus accuracy problem. Some Pentax SLR
bodies
> even focus beyond infinity because of the missing washers (caused by
> non-professional repair), but this problem could be compensate by the
> viewfinder adjustment.
>
> regards,
> Alan Chan
>
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