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12-14-2006, 01:09 PM   #1
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M42 mount Vs. "Screw mount"

Sorry for the dumb question, but is M42 mount and Screw mount - same thing or not?

Regards,
D

12-14-2006, 01:22 PM   #2
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I thought it was the same thing...........
12-14-2006, 02:20 PM   #3
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Yes and no

M42 is a screw mount but there are several different diameter screw mounts including one that is still 42mm but has a different pitch (T mount)

But, yes, in general, the terms equate especially while discussing Pentax cameras.

M42 was developed by Contax/Pentacon and adopted by Asahi on the first Pentax (I think they also used it on the very last Asahiflexes but not sure)

cheers

Greg

Last edited by wirrah; 12-14-2006 at 02:21 PM. Reason: bad spelling
12-14-2006, 02:21 PM   #4
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Yep!

Same thing, basically.


Last edited by Tom Lusk; 12-14-2006 at 02:22 PM. Reason: Question already answered!
12-14-2006, 06:57 PM   #5
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Thanks for your feedback on this topic everyone, much appreciated!

Reason for asking, I don't have funds at the moment for a true macro lens (since I just purchased K10D and have not sold my Canon gear)... I know there are some old school quality glass in M42, so I'm going to keep an eye open for some fast lens and use it with M42/K adapter and tube exnesion for now.

Any suggestion on the sharp lens to use for this setup so I know what to look for?

Regards,
D
12-14-2006, 08:50 PM   #6
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In a similar vein, will a T-mount adapter allow you to use T-mount lenses on the K10D? Seems like it should.

Of course, the question is are there any T mount lenses that are worth the effort?
12-15-2006, 06:28 PM   #7
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M42/Screw Mount

QuoteOriginally posted by Duh_Vinci Quote
Thanks for your feedback on this topic everyone, much appreciated!

Reason for asking, I don't have funds at the moment for a true macro lens (since I just purchased K10D and have not sold my Canon gear)... I know there are some old school quality glass in M42, so I'm going to keep an eye open for some fast lens and use it with M42/K adapter and tube exnesion for now.

Any suggestion on the sharp lens to use for this setup so I know what to look for?

Regards,
D
I have been using my screw mount 55mm f1.8 Super Multi Coated Takumar for some close ups using filter mount close up filters. Mine are vintage Hoyas and work fine. I have been shooting things like salt crystals for my kids science project. It is cheap and works fine. The manual focus is nice when shooting toward glass as the reflections don't fool the autofocus.

Ed
12-16-2006, 06:05 AM   #8
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Good info Ed, thanks for the feedback on those lenses!

Regards,
D

12-17-2006, 08:17 AM   #9
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your M42 mount macros will probably leave you wanting something better. when shooting macros you need a high f-stop number(smaller hole) .
after about f11 the VF gets real dim. you have to use the M42 lenses in stopped down mode. i'd suggest some extension tubes and a 50mm in K mount. that way you can focus with the lens wide open, hit the AE-L button to getting anexposure and click away. on a 50mm to get 1:1 you'll need approx 50mm of ext. tubes. i picked up mine for $15usd delivered on ebay. be sure to get a set that is mechanically linked to the aperture as with a K or M series lens.
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