Re: [APML] Focus Problem with Pentax 67

["William R. Mattil" <wrmattil@ix.netcom.com>]

Roland Roberts wrote:

>I got my film back late last week from my first use of my Pentax 67 with
>a 300mm telephoto.  I was disappointed with the focus but it wasn't all
>my fault :-)
>
>The actual focus varies from pretty sharp on one edge (but with some
>aberrations I have to thing about) to gross donuts on the other side.  I
>shot two separate rolls and both have this "feature" but I need to spend
>a little time to see if they are both showing the same gradient in the
>same orientation.
>
>Since this is my first use of the camera, and in fact my first Pentax
>67, I'm wondering if I simply loaded the camera poorly and didn't get
>the file flat and tight across the rollers and if that could cause it.
>Before I take it into a repair shop, I wanted to get some feedback from
>folks here who've used these to see what other things i might want to
>check.
>
>I'll try to get a scan of the film online later tonight to show just how
>bad it is....
>
>  
>

Roland,

When I aquired my Pentax 6x7 the original owner had replaced the back 
with the Hutech version. Then he sold the Hutech and replaced the 
original back on the camera. I had a pretty bad focus spread across the 
FOV as well but Kent and I made a bunch of measurements and lo and 
behold ... the back itself was a bit "sprung"  Hopefully your situation 
is such that the 120/220 selector was wrong but if its not then thats 
pretty much the only thing left assuming a lens thats not skewed 
somehow. It doesn't take much to mess up the focus.


Regards

Bill




-- 

William R. Mattil	:	http://www.celestial-images.com


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