Re: [APML] Focus Problem with Pentax 67

["Jason Ware" <jtw@galaxyphoto.com>]

If it is focused at the edges and out of focus in the middle its
humidity induced film creep. Many, including myself have
solved this problem with a steady steam of nitrogen. You
can get parts and tanks from a welding supply.
-- 
 -Jason Ware 

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----- Original Message ----- 
From: "Roland Roberts" <roland@astrofoto.org>
To: <astro-photo@seds.org>
Sent: Tuesday, August 16, 2005 1:14 PM
Subject: [APML] Focus Problem with Pentax 67


> 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
> -- 
>                        PGP Key ID: 66 BC 3B CD
> Roland B. Roberts, PhD                             RL Enterprises
> roland@rlenter.com                            6818 Madeline Court
> roland@astrofoto.org                           Brooklyn, NY 11220
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