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08-02-2010, 01:04 PM   #1
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Newbie Which DSLR accepts legacy lenses?

I have two Pentax K-1000 bodies from 20+ years ago that came with a wide angle lense and a telephoto lense. I understand that some of the newer Pentax DSLR cameras accept these lenses. Can anyone shed some light on which Pentax cameras accept these lenses? I would like to buy a K-x model and use the older lenses with the standard lense that comes with the K-x.

Any insight would be helpful - John

08-02-2010, 01:10 PM   #2
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All Pentax bodies will accept these lenses. Note that the FoV will be narrower by 1.5x.
08-02-2010, 01:17 PM   #3
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Here's a chart showing Pentax camera-lens compatibility.

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08-02-2010, 01:31 PM   #4
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Your old K-mount lenses will snap right onto a Kx or any other Pentax dSLR. Depending on their series type (K, M, or A) they will be rather straightforward to use. See the sticky article at the top of this forum on how to use manual lenses.

Eruditass already mentioned AoV (angle of view, aka FoV, field of view). Cut out a magazine picture. Draw on it a rectangle that's 36x24mm. That is a 135 (35mm) frame. Inside that, draw a rectangle of 24x18mm. That is the Kx's APS-C frame. The picture remains the same, but the Kx (or any comparable dSLR) sees less of it.

AoV is calculated from a lens' focal length, and the diagonal of the frame. The Kx's diagonal is 29mm; your K-1000's diagonal is 43mm, which is ~1.5x the Kx's. That's why you'll see references to a 1.5x factor. A 100mm lens DOES NOT become a 150mm lens when mounted on a Kx; it merely sees as much of a scene, as a 150mm lens would on the K-1000.

The smaller sensor also has an effect on DoF (depth of field). Your lenses are probably marked with DoF scales. Allow at least an extra f-stop when using those scales. Say if a lens is set to f/11, instead of lining up distances within the f/11 marks, use the f/8 marks instead (or even the f/5.6 marks if you want real sharpness).

Have fun!

08-02-2010, 02:39 PM   #5
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QuoteOriginally posted by jrdhooghe Quote
I have two Pentax K-1000 bodies from 20+ years ago that came with a wide angle lense and a telephoto lense.
John, you didn't say these were Pentax lenses. Plus, don't you also have a "normal for that time" 50 or 50mm lens?

Your lenses could be total garbage, which makes them no reason to buy a K-x. There are a hundred OTHER reasons to buy one, but unless you tell us the specifics of these lenses, don't get your hopes up.
08-02-2010, 08:13 PM   #6
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Right, chances are those two lenses are worth less than $100 combined. But it is a wonderful thing that with Pentax, you can actually use and get great results from such lenses!
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