Be very careful using an adapter without a spring. Focusing a bit to
energetically may cause the lens to dismount from the camera at an
inappropriate time. I had that happen to me with an actual K mount lens
I thought was securely locked in place...
On 8/8/2010 8:06 PM, Jerry in Arizona wrote:
First I want to thank all the members for their very helpful discussion and
advice. What a great group. Well today I managed to get the Non-Pentax adapter
out of the sacrificial PZ-70 without damaging the camera, especially to Derby
Chang who provided the following link.
http://www.funadium.com/m42tok.php#umount
I now have two adapters, including a Pentax brand adapter. Cuz I am basically a
coward I decided to remove the spring lock on both adapters. Tried them both on
the PZ-70 and they went on and came off with no problems. I have an M42 Super
Takumar 135mm f3.5 lens that I was eager to try out on my K20D. First I tried
to install the off brand adapter directly to the lens but then it would not
attach to the PZ-70 mount. Need to put the adapter in the camera first. Then
used the pentax adapter and the lens attached as it should. Went out on the
patio and did some test shots of sets of five (+/- .5) dial set to Av, f8.
Downloaded shots to the puter and found that I needed a -.5 correction but I was
truly amazed at the quality of the image. I am now convinced I am on the right
track. Given that the adapters are relatively cheap I will get i per lens,
remove the spring and using a automotive thread locker kinda permanantly attach
the adapter to the lens. Will be looking for a 300-400mm lens to go after those
migratory birds we will be expecting here in a couple of months.
Thanks again to all
Jerry
<<To: Pentax-Discuss Mail List<pdml@pdml.net>
Subject: Re: Using the M42 Adapter?
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On Sun, Aug 8, 2010 at 7:24 PM, Paul Ewins<paulew...@optusnet.com.au> wrote:
Pentax has the manual on-line as a PDF file:
http://www.pentaximaging.com/files/manual/Mount_Adapter_K.pdf
It says there's spring you have to push in with the tip of a ball point pen,
then you just turn it counter-clockwise until it stops& it will come out.
When it works normally, that is what happens. It should just twist and click
into place and then when you are done you use the special tool which disengages
the spring and allows you to twist it out again. Except when it goes wrong and
you can't disengage the spring and the adapter is then jammed solid. I have
heard of a few other people (apart from myself and Jerry) that this has happened
to and it is always a third-party adapter that goes wrong.
Paul
And that's one reason why I use my M42 glass on my Minolta kit
nearly-exclusively these days. Infinity focus can be an issue, but the
adapters are WAY less hassle and much cheaper. Screw the adapter on
and use them like any other bayonet lens (and at $8 each, you can
afford 1 per lens). Canon and 4/3rds adapters work the same.
The Pentax style adapters guarantee infinity focus with Pentax lenses
(but may have issues with others, especially Fujinon's) but the
adapters are way more hassle to use.
-Adam>>
--
"Here's something to think about: How come you never see a headline like 'Psychic
Wins Lottery'?"
--Jay Leno
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