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02-01-2011, 11:27 PM   #1
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SMC M 50mm f1.7 Loose front element

Need some help here.. bought an awesome lens at a swap meet, an SMC M 50mm f1.7. I pulled it out of my bag tonight and the front element, the part that extends when the focus is rotated, is loose and rattles. I can't find a screw to adjust it and don't know what to do to get it tight again. When I got it it was tight. Hmmmmm.... What to do??


Any suggestions would be appreciated!

02-02-2011, 02:39 AM   #2
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It might just need the finisher tightened up. That the bit that goes around the front optic and has the white writing saying Pentax-M 50mm.......

To tighten it, get some blue tac, be liberal with it and make a sausage shape that goes all the way around the finisher, then turn upside down and press blue tac into something like a table and then whilst pushing down hard, screw the finisher back in tight
02-02-2011, 08:04 AM   #3
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The rubber tip from a crutch works for that.
02-02-2011, 08:10 AM   #4
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I've had this happen to my m50 1.7. If it's the same as what I experienced, it's not the front element - if you check, the glass doesn't move at all - thankfully. If it is like this, you actually need to get the finisher off and tighten the tiny screws underneath. The finisher is a pig to get off - the way Gareth suggests sounds good. It screws all the way up through the filter/hood threads. Then you need a jeweller's philips screwdriver to tighten the screws. You may want to put a bit of glue on the threads, as mine is already loose again after I screwed a rather bent lens hood on it. Although you may not want to take the risk...

02-02-2011, 08:55 AM   #5
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Them screws! Forgot about them! I once bought a lens off Ebay that was described as faulty as it rattled. When I got it I took the finisher off and I saw one of the screws had somehow come loose and was rattling around. Screwed it back in tight and it was as good as new
02-02-2011, 12:33 PM   #6
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You guys are AWESOME!!! Thanks SO MUCH!! It was the finisher and I had no idea! I used a pencil eraser to remove it and put it back on. The small screws underneath were tight so that was no worry. THANKS AGAIN!!!
02-02-2011, 01:58 PM   #7
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Glad to help
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