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Latest Review Posted Carl Zeiss 20mm F2.8 Flektogon MC
I had actually been gifted this lens for 20$. I don't know what the reason was. It had fungus behind front glass and glass was not in pristine condition to say frankly. From the outside it was intact. Besides not having a hood and lens caps it was pretty ok. The wide focal length that I wanted for some time for K-1 but just could not find a suitable lens.

It is M42 and by using standard M42 to K-mount adapters you will not be able to fix it in a position on camera as it will always rotate a little bit while focusing. Some M42 lenses are totally fine as when they are screwed into the camera body they will firmly press onto the mount at the body and stay firm. I noticed issues with Pentacon lenses and this Carl Zeiss Jena is not much different. So, I had to drill a small hole at the mount of this lens to accommodate locking pin from the camera body when the lens is fully screwed in. No more wobbling if this is done precisely which I did. The lens becomes locked onto the body like any other Pentax K-mount lens. That works great now.

Initially lens had to be cleaned from fungus which now makes it fungus free, for how long I don't know. It was not that serious as the front glass element can be removed easily. Focus adjustment for this lens has to be done when front lens group is removed in which case you can't use live view to adjust focus. Using live view is possible on some Pentax lenses as the focus ring can be rotated to required position by removing couple of screws be...

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