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01-24-2015, 04:13 AM   #1
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Vivitar lens query

I have found a Vivitar lens in a nearby cash converters store for 12, at that price I am not expecting much to be honest.

Before I decide to buy it I thought I'd like to get some opinions. I've take pics of the lens (top, bottom and sides) as I've not been able to find any solid info on it and just come up with models that are similar, but not the same. Also want to confirm that the mounting is correct for my K20D, I did try the lens on it, but I wasn't sure it clicked properly, and it seemed reluctant to release.

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01-24-2015, 04:59 AM   #2
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for that kind of money - why not?

If I find a lens which range I don't have already for less money than I spend at BK or my favorite Italian restaurant, I buy it. If it sucks it will look nice on the shelf.
01-24-2015, 05:05 AM   #3
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This is an very early version, probably made by Tokina, as indicated by the serial number starting with 37x.

It was available in many different mounts. Not a real spectacular lens, but at this price it might be fun to play with it.

The mount may be a little crudely finished and that is what is causing the fitment problems. I usually check the mount for binding with a magnifier. If it is too tight, remove the mount and buff it a little if necessary. You can also apply an extremely thin (almost invisible) coat of wax with a Q tip. I would also check that the aperture lever is not binding, by moving it back and forth with the f stop set to f22. The mount is marked P/K so it is definitely for your camera.
01-24-2015, 05:16 AM   #4
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Great, I'll grab it on payday then, so long as it's still there.

01-24-2015, 07:36 AM   #5
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It doesn't look like this lens has it, but some older Vivitar lenses had rear tabs which stuck out too far and needed to be removed or cut down for use on DSLRs. That was the first thing that sprung to mind when you said you'd had problems mounting and releasing the lens.
01-24-2015, 07:40 AM   #6
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The vivitar reviews only have the kiron made version. Would be interesting to hear what this one is like.
01-24-2015, 07:53 AM   #7
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Possibly this lens:
Tokina RMC 75-150mm F3.8 Constant Aperture Lens Reviews - Tokina Lenses - Pentax Lens Review Database
01-24-2015, 08:09 AM   #8
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Yes, the Tokina lens looks pretty much like the lens in the store.

01-24-2015, 09:02 AM   #9
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If that's what I think it is (a third-party version of the Nikon E 75-150) then it's a brilliant lens. Go for it, before someone else does. Screw payday
01-24-2015, 10:15 AM   #10
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Buy it if it appeals to you. Check that it focuses and zooms smoothly without grabbing, look carefully for fungus vith a flashlight, and make sure the aperture is clean and snappy. Price is good.

There is a review here of a later version made for Vivitar by another maker, Kiron, which sells for $29 average price.
Vivitar - Kiron (+ matched 2x TC), 70-150mm F3.8 Lens Reviews - Vivitar Lenses - Pentax Lens Review Database

That kiron is a so so lens, but this is earlier and made by Tokina, probably a rebadged version of this Tokina: Tokina RMC 75-150mm F3.8 Constant Aperture Lens Reviews - Tokina Lenses - Pentax Lens Review Database the reviews say it's a better lens than the Kiron.
01-24-2015, 10:34 AM   #11
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Yeah, I'll take my camera along with me and try the lens with a few snaps to make sure it's working ok. Found this one when i was looking for a manual prime lens for night photos.
01-30-2015, 12:32 PM   #12
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Well, I have the lens, let the experimenting begin :-) (any tips for using a manual lens?).
01-30-2015, 01:06 PM   #13
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Just review the following for now:
https://www.pentaxforums.com/forums/54-pentax-lens-articles/110657-how-use-me...k-x-k-7-a.html
https://www.pentaxforums.com/forums/53-pentax-dslr-camera-articles/100260-man...ic-lenses.html

You should get the EV bar meter when using the Optical DOF preview in manual mode on the K20D.
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