You have two reasons, it's unnecessary if you use lenses with aperture
rings and it's hugely expensive.
On 3/15/2011 9:04 PM, drd1...@gmail.com wrote:
I stand corrected. I appreciate having a reason not to buy it.
-----Original Message-----
From: Godfrey DiGiorgi<gdigio...@gmail.com>
Sender: pdml-boun...@pdml.net
Date: Tue, 15 Mar 2011 18:00:57
To: Pentax-Discuss Mail List<pdml@pdml.net>
Reply-To: Pentax-Discuss Mail List<pdml@pdml.net>
Subject: Re: Pentax glass on m4/3: weird behavior
The hugely expensive Novoflex adapters are only really necessary with
Pentax lenses that do not have an aperture ring. They allow manual
adjustment of the aperture by providing a secondary ring which moves
the iris actuator mechanism, similar to but more flexible than what I
used to do with the DA21 and DA70 when adapted to the L1 (I just stuck
a little museum putty between the iris actuator and the adapter to set
the lens opening I wanted to use).
It has nothing to do with AE ... No lens adapter made that I've seen
does the auto-iris thing. Auto Exposure is supported with any adapter
in aperture priority mode: you set the lens opening you want and the
camera sets the shutter speed to match it. Camera's don't need
aperture position information to meter correctly that way.
On Tue, Mar 15, 2011 at 5:20 PM, Steven Desjardins<drd1...@gmail.com> wrote:
The Novoflex one is the best and lets the AE work:
http://www.bhphotovideo.com/c/product/646936-REG/Novoflex_MFT_PENT_Pentax_K_to_Micro.html
Of course, it costs what a lens costs.
On Tue, Mar 15, 2011 at 8:15 PM, J.C. O'Connell<hifis...@gate.net> wrote:
seems like it would have to be off by more than 0.36mm for the
results your getting, something doesn't add up.
--
J.C. O'Connell (mailto:hifis...@gate.net)
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-----Original Message-----
From: pdml-boun...@pdml.net [mailto:pdml-boun...@pdml.net] On Behalf Of
Dario Bonazza
Sent: Tuesday, March 15, 2011 8:05 PM
To: Pentax-Discuss Mail List
Subject: Re: Pentax glass on m4/3: weird behavior
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"<dario.bona...@virgilio.it>
To: "Pentax-Discuss Mail List"<pdml@pdml.net>
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-/2506
30349531?pt=Lens_Accessories&hash=item3a5abba2db
Dario
----- Original Message -----
From: "Steven Desjardins"<drd1...@gmail.com>
To: "Pentax-Discuss Mail List"<pdml@pdml.net>
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
<dario.bona...@virgilio.it> 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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