Let's do some math:
K bayonet register = 45.46mm
m4/3 register = 19.25mm
Then K-m4/3 adaptor must be 45.46 - 19.25 = 26.21mm
A caliper reads 25.85mm for my adaptor.
Hence it looks like being 0.35mm short. Is that enough for such a weird
behaviour?
Dario
----- Original Message -----
From: "Dario Bonazza" <[email protected]>
To: "Pentax-Discuss Mail List" <[email protected]>
Sent: Wednesday, March 16, 2011 12:41 AM
Subject: Re: Pentax glass on m4/3: weird behavior
No name on it, found in ebay from Hong Kong. I bought it some time ago,
but I can no longer find trace of that auction. However, it could be this
one:
http://cgi.ebay.com/Pentax-PK-K-lens-Micro-4-3-Adapter-EP-1-GF1-G1-GH1-/250630349531?pt=Lens_Accessories&hash=item3a5abba2db
Dario
----- Original Message -----
From: "Steven Desjardins" <[email protected]>
To: "Pentax-Discuss Mail List" <[email protected]>
Sent: Tuesday, March 15, 2011 11:53 PM
Subject: Re: Pentax glass on m4/3: weird behavior
I'd like to hear this myself. What brand of adaptor?
On Tue, Mar 15, 2011 at 6:02 PM, Dario Bonazza
<[email protected]> wrote:
Hello gang,
I've just tried a few Pentax lenses on my Panny GF-1 (via K-micro4/3
adapter), just to find a weird behaviour.
With close subjects (inches to meters), the actual distance of my
subject
(properly focused by looking at magnified LCD) can be similar to that
one
indicated on the distance scale of the lens. However, when trying to
properly focus at infinity I have to set a much closer distance on the
lens
ring, with larger and larger offsets as focal legths shorten.
Examples:
100mm lens focused at infinity -> focusing ring is set at 15-20m;
50mm lens focused at infinity -> focusing ring is set at 7-10m;
28mm lens focused at infinity -> focusing ring is set at 3m!
With a Samyang 8mm fisheye, there's no way to focus (lens helicoid has
no
run enough to find focus). It happens that by setting the focus at its
minimum focus distance, the lens is almost (but not yet) focused at
infinity. By approaching the subject, things become worse.
Have you ever seen anything like that? How would you explain that? Wrong
adapter? Too short to set proper register distance for K-bayonet lenses?
Cheers,
Dario
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