SMC-A 50mm F1.7 - repair help needed

rupi · 01-16-2013, 12:34 PM

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Hello,
I bought cheap (25 euro) a SMC-A 50mm F1.7, but there is a problem, 2 spheres are missing.
The major problem is that little sphere that makes the A contact is missing, so it doesn't work in A mode.
Another one is the sphere that makes the clicks in the aperture ring is also missing, but that one is more or less irrelevant. Otherwise the lens in in good shape, the glass is very clean and the aperture blades are snappy.
I wonder if any of the nice folks here in forum as some advice to fix this problems.
Does anyone know some sphere of the same diameter as the missing that could be used, or some other workaround to fix the A contact?
Thanks in advance.

glasbak · 01-16-2013, 01:52 PM

In the A lenses, the 'A' contact is not a ball, it's a rounded pin.
Looks like somebody opened the lens, and did not put all back in.
Find a donor lens, maybe the overabundant takumar-a or pentax-a 28-80 has some suitable parts.

Fl_Gulfer · 01-16-2013, 02:15 PM

Also look for a cheap SMC-A 50mm F2 they are on ebay all the time .
http://www.ebay.com/sch/i.html?_sacat=0&_from=R40&_nkw=SMC+PENTAX-A+50mm+F2&_sop=15

rupi · 01-16-2013, 02:38 PM

Thanks for the replies.
I searched a little longer and found right here in the forum what is the piece that I need.
It's not as easy as I thought. The best solution, as you suggested is probably getting a cheaper A lens like the 28-80 to get the contact pin.

01-16-2013, 12:34 PM	#1
rupi Forum Member Join Date: Jun 2009 Location: Portugal Posts: 50	SMC-A 50mm F1.7 - repair help needed Staff note: This post may contain affiliate links, which means Pentax Forums may earn a small commission if a visitor clicks through and makes a purchase. If you would like to support the forum directly, you may also make a donation here. Hello, I bought cheap (25 euro) a SMC-A 50mm F1.7, but there is a problem, 2 spheres are missing. The major problem is that little sphere that makes the A contact is missing, so it doesn't work in A mode. Another one is the sphere that makes the clicks in the aperture ring is also missing, but that one is more or less irrelevant. Otherwise the lens in in good shape, the glass is very clean and the aperture blades are snappy. I wonder if any of the nice folks here in forum as some advice to fix this problems. Does anyone know some sphere of the same diameter as the missing that could be used, or some other workaround to fix the A contact? Thanks in advance.

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01-16-2013, 01:52 PM	#2
glasbak Veteran Member Join Date: Apr 2009 Location: Netherlands Posts: 369	In the A lenses, the 'A' contact is not a ball, it's a rounded pin. Looks like somebody opened the lens, and did not put all back in. Find a donor lens, maybe the overabundant takumar-a or pentax-a 28-80 has some suitable parts.

01-16-2013, 02:15 PM	#3
Fl_Gulfer Veteran Member Join Date: Jul 2007 Location: Florida Gulfer Photos: Albums Posts: 3,054	Also look for a cheap SMC-A 50mm F2 they are on ebay all the time . http://www.ebay.com/sch/i.html?_sacat=0&_from=R40&_nkw=SMC+PENTAX-A+50mm+F2&_sop=15

01-16-2013, 02:38 PM	#4
rupi Forum Member Join Date: Jun 2009 Location: Portugal Posts: 50 Original Poster	Thanks for the replies. I searched a little longer and found right here in the forum what is the piece that I need. It's not as easy as I thought. The best solution, as you suggested is probably getting a cheaper A lens like the 28-80 to get the contact pin.

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