[panonski]

My dear friends, I bought russian lens McHelios 44M-4 with m42 mount, and adapter for K mount - M42 Pentax from e bay.

When I mount the adapter, and after that the lens - I was surprised ( negatively ) that aperture ring, or aperture blades doesn't work when lens is mount on my Pentax K3.

Far as I know, nobody have a problem with mounting Russian lens on Pentax body, with this adapter, and everything is working fine in manual ( at least I haven't seen any ones compliant on the internet about this )

My lens have one pin on the mount side, and when is pressed down ( it's on spring inside ) the aperture blades and ring works just as it should be.

--

Problem is, when I mount the lens on K3, there is no any mechanical part on my camera, neither on adapter, which will press this pin inside so the aperture ring would work as it should

I will post some pics here - maybe I got the unusual lens, or wrong adapter, or maybe it's just another unknown reason, why this pin is not work as it should

Attached Images

View Picture EXIF

File Date

 

View Picture EXIF

File Date

 

View Picture EXIF

File Date

 

View Picture EXIF

File Date

 

[arnold]

Some people remove the pin, or glue it in. There is no other way to have manual control like you can on a Tacumar.

[panonski]

so, it seems everything is normal here - I must deal with it

[Na Horuk]

There are many different versions of the Helios 44 lens, and they come in different mounts with different automations. I recommend you search for threads about the same lens model as you have.
I have heard before of using some glue to keep the pin pressed in. Just be careful what kind of glue you use. You only need a small dab

[Not a Number]

There are adapters that have a "lip" to press in the pin. I would remove the spring clip on them to keep them from jamming though.

General Brand Pentax-K Body to Universal Lens Adapter ABPKS B&H

[i_trax]

get a pliers, bend the pin slightly, push it in, should stay in, all ready to go and fully reversible.
enjoy this great lens....

[LensBeginner]

Some open the lens from the bottom, make a little spiral with the iron wire from a paperclip around the pin, to space it from the bottom elements.
Easier to do than to explain!

Edit: ah, there it is!
https://www.pentaxforums.com/forums/10-pentax-slr-lens-discussion/57058-helio...onversion.html

---

Last edited by LensBeginner; 10-01-2016 at 04:42 AM.

[pathdoc]

Aah, the auto-manual switch. Even in the Takumar years, Pentax (and others) were addressing the issue of back-compatibility - in this case with earlier models of camera bodies that didn't have the flapper plate to close the aperture down. Nobody back then had any idea that these lenses would still be being used long after the M42 mount was a spent force, nor that A/M switch back-compatibility would also provide the ultimate in forward compatibility (since DSLRs do not have an M42 flapper plate)!

Best of luck in converting your Helios, OP. I hear they're great lenses.

[goatsNdonkey]

My Helios 44-2 F2 58mm is too primitive to have the pin. It's a "preset" lens, meaning you set the aperture with one ring, and twist the other ring on the front to either open the aperture for focusing or to close it to the setting dialed in by the other ring.

[panonski]

get a pliers, bend the pin slightly, push it in, should stay in, all ready to go and fully reversible.
enjoy this great lens....

i JUST did that, and it work of course - Pin is by the way very strong, I bend it real good, and push it inside, now is locked inside and aperture works fine


Thank you all


ps

This lens has very butter cream bokeh in non sharp areas when you use 2.0 apperture... It's real pleasure to use it... To bad there is no shake reduction...

By the way - why is that so- when Pentax have stabilisation in body ? I heard promises from Pentax earlier - that I can use every lens - and stabilisation will work either..

[i_trax]

the shake reduction will work with every lens, you just need to enter manually the focal length