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10-05-2014, 04:05 PM   #1
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A bit lost with Pentax K mount and SLR body

Hi.

I'm interested in purchasing a specific objective lens for a Pentax K1000 but I'm lost when talking about mounts and modern DSLRs' objetives.
The problem comes with the Pentax K1000 mount. I don't know exactly which objectives would fit or which won't. Ok, I know ye ol' K Mount objectives do fit, but what about modern ones?

Lets say I want a Tamron 18-100mm that uses a Pentax K mount, would I be able to fit it with the K1000?

I'm interested in a zoom lens like that tamron, but not necessarily that zoom range. What I'm exactly looking for is a zoom lens with the lowest possible focal length and also a medium focal length like 100. The minimun focal length in the maximun zoom would be 75 and the maximun 150 (this is, a 18-75 is ok, but a 18-50 no). A 15-100 would be perfect for my needs.

I don't need AF or any other kind a automatism, since this objective is going to be used exclusively on the K1000.

Any recommendation? Does exist any kind of adaptor ring to fit any pentax/nikon/canon/whatever to the K1000 mount? Since I already have several modern objective lenses from several brands that they don't fit the K1000 it would be nice to fit them in the K1000 without spending too much.

Thanks in advance.

10-05-2014, 04:11 PM   #2
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Tamron 18-100mm Yes it will be...
10-05-2014, 04:12 PM   #3
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Any K-mount lens will fit, but it needs to have an aperture ring, otherwise you won't be able to meter. Also, most digital-era consumer kit lenses will not cover the film image circle. The widest you'll get in a film-compatible walkaround zoom lens will be around 24mm, but older lenses won't go that wide.

See this chart for specific compatibility when it comes to genuine Pentax lenses:
The Pentax Camera Lens Compatibility Chart

I would recommend the following lens, which works great on film:
SMC Pentax-A 35-105mm F3.5 Reviews - A Zoom Lenses - Pentax Lens Reviews & Lens Database

Adam
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10-05-2014, 04:12 PM   #4
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Any K-mount lens with an aperture ring will work on your K-1000 as will most M-42 screw mount lenses with adapter.


Steve

10-05-2014, 04:52 PM   #5
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You are likely better of looking at an older zoom. You don't mention about IQ requirements, but you generally get better results at wider apertures with less zoom range. I like the Vivitar series 1 28-90mm f/2.8-3.5 (which is already 3x which is quite a zoom range--especially starting at 28mm--but it does so by not being parafocal). For the K1000 you don't need the (later) PKA version--and as an example a BGN version at KEH is (now listed) at $54.

Wider (e.g., 24mm) will generally mean the long FL end is 50mm--but I don't look at zooms other than older Pentax, Vivitar and Tamron Adaptall-2. More modern lenses may have wider FL range--but as noted above you need an aperture ring for the K1000.

You should be aware some non Pentax lenses have a large guard ring at the rear that needs to be removed (and if desired filed down)--generally 3 screws (the one I mentioned doesn't). Also some are designed for Ricoh K mount and have a pin that can cause the lens to get stuck and a feeler gauge is needed to remove it. Both these problems are not very common--and as long as you are aware of it you should be fine.

---------- Post added 10-05-14 at 04:57 PM ----------

Oh--about adapting other lens mounts--the Pentax K has a rather long register length--thus few lenses (few 35mm format lenses--medium format can) can be adapted w/o a built in lens to refocus the image (except for macro use).

Last edited by dms; 10-05-2014 at 05:00 PM.
10-05-2014, 07:45 PM   #6
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There's a Pentax FA 24-90 in the marketplace right now. That is the zoom that comes to mind as the closest to your specs, and has a decent reputation. I think 24mm is quite wide on 35mm film. I might be forgetting some lenses, but lenses that start wider often fall well short of your long-end needs, like 19-35mm.

If you are OK starting at 28mm, selection is a lot better. Pentax had an FA 28-200, I think licensed from Tamron who sold a version as well. Pentax also had several 28-105mm lenses.
10-05-2014, 08:57 PM   #7
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If you can find it the Kiron 28-210mm f/3.8-5.6 is a sweet lens. It's considered a "cult" lens so be prepared to pay premium prices for it. Make sure it is for the Pentax K mount or even better K-mount with electrical contacts (P/KA).
10-06-2014, 03:12 AM   #8
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Thanks for all those tips. Really useful. I will look into those lenses. The Pentax FA 24-90 looks like what I need.
The Kiron 28-210mm f/3.8-5.6 is a great lens, but I don't need that much focal length. But for future photography, I will take into account also.

QuoteOriginally posted by Adam Quote
Any K-mount lens will fit, but it needs to have an aperture ring, otherwise you won't be able to meter. Also, most digital-era consumer kit lenses will not cover the film image circle. The widest you'll get in a film-compatible walkaround zoom lens will be around 24mm, but older lenses won't go that wide.

See this chart for specific compatibility when it comes to genuine Pentax lenses:
The Pentax Camera Lens Compatibility Chart

I would recommend the following lens, which works great on film:
SMC Pentax-A 35-105mm F3.5 Reviews - A Zoom Lenses - Pentax Lens Reviews & Lens Database
I appreciate your help. Really usefull and solved all my doubts.

Is there any recommended objective in the range 18-75+? I really need less focal length but with zoom that is more than 50mm, since I already have a 50mm objective and is very limited to me.


In either case, i will search for your SMC Pentax-A objetcive. it looks really great and could fit most of my needs (then I will have to get a 18mm one to fill the wider field gap).

Thanks.


Last edited by Pentax1000; 10-06-2014 at 03:19 AM.
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