Hassy lens problem

I recently purchased an older chrome 150 mm lens. The lens seems to be in excellent condition. I have noticed some problems that I am not sure affect the lens and it's operation. 1. First I have noticed what look like slight imperfections in the lens in the form of very tiny round bubbles. I thought they wear dust or dirt, but upon closer examination with a magnifying lens they look like round bubbles. Is this normal for the older lens? 2. Second, when the lens is off camera and I adjust the apiture from F 11 on up the appitue stops moving or closing down. I checked out my newer T* 80mm C lens and the apiture moves all the way down through F22. Also there is a sliding sound like it is shifting gears at this point. I mounted it on my body and took the back off so I could observe the lens. After looking the mirror up I tried adjusting the apiture again. This time it stoped at f 16, but when I released the shutter the apiture closed down to what I had considered the proper position for f22 the instant that shutter was released. Is there a cause to this and what should I do? 3. Third, I took a test roll and my lab developed it for me free :-). The main thing I noticed was that my densities came back really low, underexposed. The lab brought them up, but they felt the pictures came in under around 33 to 64. I know I metered them right and I ran both indoor and outdoor shots. I am worried that the shutter speeds are off and thus cloding the shutter to quickly. How do I test this. Fortunately I got a years warrenty when I bought it, so I may just need to send it back and ask for an overhall.

 

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Thanks

 

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W. Berry

The older C lenses have a coupling between aperture and shutter speed. So as you change aperture you are changing shutter speeds as well (unless you hold the coupling release). That is probably the source of the gear sounds. Also, older high quality optical glass did contain bubbles but I've always read that it doesn't hurt image quality.

I recently started taking pictures with my father's circa 1960 500c. I noticed what looks like delamination of optical elements (I don't know if the lens had any elements like that, but that's what it looks like) from the edge to about 1/8" in around perhaps 15% of the periphery. It's an 80mm Zeiss 2.8 Planar just for reference. I figure I'm losing some fraction of a stop and I can't see anything in the pictures it takes. I doubt it could be repaird for less than a new lens anyway.