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06-20-2012, 02:28 PM   #1
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Helios with weird aperture behavior [solved]

I just got a Helios-44 which is showing weird behavior. First off, as far as I can tell, it really is a 44 and not a 44-2. It seems to have 8 blades, and fits my m42 mounts, which from what I have read makes it an unusual lens for a helios. Based on this site, ACP - Logos it came from the MMZ factory.

When I turn the aperture ring from 2 to 2.8, the lens opens up. The ring won't go past 2.8. My understanding, from this thread, is that the aperture numbering is in a reversed notation https://www.pentaxforums.com/forums/pentax-slr-lens-discussion/148229-helios-...markingss.html. So I think that I understand why the aperture is opening up as I go to higher numbers. However, that the ring only turns in a limited range and won't stop down completely still seems to be a real problem. Before I go back to the seller and start complaining I thought I should turn to this wonderful community for some help and advice.


Last edited by MSL; 06-20-2012 at 02:39 PM.
06-20-2012, 02:32 PM - 1 Like   #2
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1. There also was an M42 Helios 44.
2. There are actually 2 aperture rings on this lens (it's a preset lens) - one with hard stops, on the exterior, and another one which slides and closes the diaphragm to the selected aperture value. There's a high chance yours is just set at f/2.8. In that case set it at f/16.
06-20-2012, 02:33 PM - 1 Like   #3
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There should be two rings. The aperture ring and the preset ring. The preset ring constrains the aperture ring when in its "active" position. Flip the preset ring to its "open" position and you should be able to freely set the aperture ring.


Steve
06-20-2012, 02:38 PM   #4
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Yay @stevebrot and yay @kcobain1992. I saw the second red dot, but didn't realize it was part of ring that turned. Problem solved although the solution is closer to kcobain1992 in that there doesn't seem to be an active or inactive position for the second ring, but merely a way to adjust it from f2 to f16.

06-20-2012, 03:12 PM   #5
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Hey, great you got one! Can't wait to see some pics.
06-20-2012, 04:37 PM   #6
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Me too - been hard to find time to go shooting. At least I now know what a preset lens is.
06-21-2012, 12:37 PM   #7
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QuoteOriginally posted by MSL Quote
Yay @stevebrot and yay @kcobain1992. I saw the second red dot, but didn't realize it was part of ring that turned. Problem solved although the solution is closer to kcobain1992 in that there doesn't seem to be an active or inactive position for the second ring, but merely a way to adjust it from f2 to f16.
One allows you to set the aperture. The other actually stops the lens down. With the setting ring on at f/16 you can use the other ring to dial-up any aperture you want. The is helpful when doing stop-down through-the-lens metering, but not particularly useful if you are using a hand-held meter or flash.


Steve
06-21-2012, 01:59 PM   #8
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QuoteOriginally posted by stevebrot Quote
One allows you to set the aperture. The other actually stops the lens down. With the setting ring on at f/16 you can use the other ring to dial-up any aperture you want. The is helpful when doing stop-down through-the-lens metering, but not particularly useful if you are using a hand-held meter or flash. Steve
Thanks Steve. I actually found it helpful when using flash for some macro shots as I could gently dial up or down the aperture much like a focusing ring, which made it easier to hold the focus in place. I need to take a few more test photos though - the lens seems to have an air bubble just behind the front glass [sigh], but so far I don't think it has affected the images.

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