Replacing the rear glass of an A 50 1.7

Varun · 05-27-2021, 10:56 AM

Hi, So i have a pentax A 50 1.7 with extremely hazed out rear glass. Apart from that everything else is in very good shape without even a speck of fungus. So i was wondering if it was possible to replace that rear glass with one from that of an M 50 1.7 because i have one of those M versions lying around which is in pretty bad shape but with clean rear glass. So is it possible? Any help and information regarding this is appreciated. Thanks

**othar** · 05-27-2021, 11:18 AM

As far as I know share both lenses the same optical design (the F 50/1.7 too) so it shouldn't be a problem to switch them

**ismaelg** · 05-27-2021, 02:12 PM

Go for it! That is the only one way to find out.

Very minor thing: I suppose lenses were calibrated at the factory, so don't be surprised if the distance scale ends up a hint off. Not a big deal by any means.

Thanks,
Ismael

Aaron28 · 05-27-2021, 03:22 PM

Originally posted by ismaelg

Go for it! That is the only one way to find out.

+1 !!! totally worth a shot

**pentaxus** · 05-27-2021, 10:54 PM

The optical design is the same but the part that houses the lens group is probably different. Doesn't hurt to try, though.

05-27-2021, 10:56 AM	#1
Varun New Member Join Date: May 2021 Posts: 3	Replacing the rear glass of an A 50 1.7 Hi, So i have a pentax A 50 1.7 with extremely hazed out rear glass. Apart from that everything else is in very good shape without even a speck of fungus. So i was wondering if it was possible to replace that rear glass with one from that of an M 50 1.7 because i have one of those M versions lying around which is in pretty bad shape but with clean rear glass. So is it possible? Any help and information regarding this is appreciated. Thanks

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05-27-2021, 11:18 AM	#2
othar Site Supporter Join Date: May 2014 Location: Linz Photos: Albums Posts: 3,098	As far as I know share both lenses the same optical design (the F 50/1.7 too) so it shouldn't be a problem to switch them

05-27-2021, 02:12 PM	#3
ismaelg Loyal Site Supporter Join Date: Apr 2009 Location: Puerto Rico Photos: Gallery Posts: 2,684	Go for it! That is the only one way to find out. Very minor thing: I suppose lenses were calibrated at the factory, so don't be surprised if the distance scale ends up a hint off. Not a big deal by any means. Thanks, Ismael

05-27-2021, 03:22 PM	#4
Aaron28 Pentaxian Join Date: Jan 2015 Location: Huntsville, Al Posts: 7,131	Originally posted by ismaelg Go for it! That is the only one way to find out. +1 !!! totally worth a shot

05-27-2021, 10:54 PM	#5
pentaxus Site Supporter Join Date: Jun 2010 Location: Central Coast, CA Posts: 1,320	The optical design is the same but the part that houses the lens group is probably different. Doesn't hurt to try, though.