FA77 observation...

[Alan Chan]

After the yet to be finished adventure of my brand new FA31 (being checked 
with Pentax now), I discovered something interesting about my FA77 
yesterday. I have purchased an used metal Takumar 100mm hood and see if it 
works on my FA77 which has a rather shallow hood. It seemed to work fine, 
but after a while, the focus ring started to feel resistance. All these 
years it was light and firm, but now it feels different suddenly. The 
strange thing is, the focus ring feels light again if the camera was shifted 
to portrait format (on camera or not really doesn't matter). I thought it 
was the weight of the metal hood which caused the "drag". But it stays that 
way even without the hood, only slightly less "drag". Now I am puzzling, 
what could be the reason behind this? It cannot be distortion due to the 
weight of the hood which is not that heavy even though it is metal. I cannot 
imagine it was normal wear either because it was fine all along. So what is 
it? An idea? If it helps, I upload the illustration of this lens at 
http://www3.telus.net/wlachan/PL41410_new.pdf.

regards,
Alan Chan
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