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OV-DesertRat · 08-15-2011, 12:28 PM

I just got an older Vivitar 28mm lens to put on my ME Super. It looks like a K Mount but I can't get it to seat in the camera (won't drop all the way into the opening). Should I return the lens or is this a common problem with a reasonably simple fix?

Thanks,
Ken

**boriscleto** · 08-15-2011, 12:34 PM

The aperture lever protector is too long on old Vivitars.

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stevebrot · 08-15-2011, 02:02 PM

Originally posted by boriscleto

The aperture lever protector is too long on old Vivitars.

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Either that or it is not K-mount. What is engraved on the mount surface or lens barrel?

Steve

OV-DesertRat · 08-15-2011, 06:07 PM

Originally posted by stevebrot

Either that or it is not K-mount. What is engraved on the mount surface or lens barrel?

Steve

The lens barrel says "LENS MADE IN JAPAN 0/0M"

The front of the lens has "MC" and "No. 28174883"

It doesn't have the large aperture cover problem. In fact, there is no aperture lever cover. Other than that it "looks" like a K mount - flanges are same size etc.

Thanks,
Ken

JeffJS · 08-15-2011, 06:24 PM

It's an Olympus OM Mount. It can be converted but is it worth it to you to do so? Which 28mm Is it and what did you give for it?

If it were a K mount it should fit your ME Super with no problem. On a Pentax DSLR however, Boriscleto is correct. The guard is too large and must be shaved down.

RioRico · 08-15-2011, 08:14 PM

Yes, it's an Oly OM-mount lens, and your problem isn't with the aperture linkage, but with the bayonet flags. The flags on the OM lens are just too thick to fit under a PK-mount's lugs. I have modified several such lenses -- it's pretty easy. I use a Dremel metal-cutting blade to taper the lens flags so they *do* fit under the mount lugs. If you feel like performing minor surgery, I'll dig up my documentation here -- I've posted that a few times.

I don't recommend the surgery if 1) it's a heavy lens, like over 500g, or 2) it's an expensive lens. But a Viv 28 fits neither category, so it's just a matter of: How steady are your hands and your nerve? And yeah, if you paid over US$25 for the lens and it was REPRESENTED as being for Pentax, you should get your money back and find a 28 that already fits. It's not like they're rare or anything. Good luck!

08-15-2011, 12:28 PM	#1
OV-DesertRat Inactive Account Join Date: Jul 2011 Location: Sparks, NV Posts: 7	Vivater lens mount problem I just got an older Vivitar 28mm lens to put on my ME Super. It looks like a K Mount but I can't get it to seat in the camera (won't drop all the way into the opening). Should I return the lens or is this a common problem with a reasonably simple fix? Thanks, Ken

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08-15-2011, 12:34 PM	#2
boriscleto Loyal Site Supporter Join Date: Dec 2009 Location: North Syracuse, NY Photos: Gallery Posts: 16,477	The aperture lever protector is too long on old Vivitars. Search PentaxForums.com - Pentax Forum, Reviews, and News

08-15-2011, 02:02 PM	#3
stevebrot Otis Memorial Pentaxian Join Date: Mar 2007 Location: Vancouver (USA) Photos: Gallery \| Albums Posts: 42,007	Originally posted by boriscleto The aperture lever protector is too long on old Vivitars. Search PentaxForums.com - Pentax Forum, Reviews, and News Either that or it is not K-mount. What is engraved on the mount surface or lens barrel? Steve

08-15-2011, 06:07 PM	#4
OV-DesertRat Inactive Account Join Date: Jul 2011 Location: Sparks, NV Posts: 7 Original Poster	Originally posted by stevebrot Either that or it is not K-mount. What is engraved on the mount surface or lens barrel? Steve The lens barrel says "LENS MADE IN JAPAN 0/0M" The front of the lens has "MC" and "No. 28174883" It doesn't have the large aperture cover problem. In fact, there is no aperture lever cover. Other than that it "looks" like a K mount - flanges are same size etc. Thanks, Ken

08-15-2011, 06:24 PM	#5
JeffJS Inactive Account Join Date: Aug 2008 Location: Michigan, USA Photos: Gallery \| Albums Posts: 7,484	It's an Olympus OM Mount. It can be converted but is it worth it to you to do so? Which 28mm Is it and what did you give for it? If it were a K mount it should fit your ME Super with no problem. On a Pentax DSLR however, Boriscleto is correct. The guard is too large and must be shaved down.

08-15-2011, 08:14 PM	#6
RioRico Veteran Member Join Date: Jun 2008 Location: Limbo, California Posts: 11,263	Yes, it's an Oly OM-mount lens, and your problem isn't with the aperture linkage, but with the bayonet flags. The flags on the OM lens are just too thick to fit under a PK-mount's lugs. I have modified several such lenses -- it's pretty easy. I use a Dremel metal-cutting blade to taper the lens flags so they do fit under the mount lugs. If you feel like performing minor surgery, I'll dig up my documentation here -- I've posted that a few times. I don't recommend the surgery if 1) it's a heavy lens, like over 500g, or 2) it's an expensive lens. But a Viv 28 fits neither category, so it's just a matter of: How steady are your hands and your nerve? And yeah, if you paid over US$25 for the lens and it was REPRESENTED as being for Pentax, you should get your money back and find a 28 that already fits. It's not like they're rare or anything. Good luck!

Vivater lens mount problem

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