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07-17-2011, 02:44 PM   #1
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What is this mount?

I am going to buy Haminex 28 mm 2.8 but I'm not sure with the mount. I think that it's a M42 screw. I attach the photo of my reduction and the second photo is photo of mount. Thank you for your replies.

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07-17-2011, 02:58 PM   #2
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Is it M42 screwmount? HELP!

Hi, I am going to buy Haminex 28 mm f/2.8 for 10 pounds with postage, but I'm not sure with that mount, I think that is a M42 screwmount and I have a reduction to K-mount. Am I right?

Last edited by Peter Zack; 07-17-2011 at 07:52 PM.
07-17-2011, 04:08 PM   #3
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It does look like a m42.
07-17-2011, 04:41 PM   #4
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Yes

It looks like a M42 mount. It could be a M37, but there is an adapter for that as well, so if you think it's a good buy, then I would go for it.

07-17-2011, 04:55 PM   #5
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Ditto as above. However me thinks it maybe one of the ones from ebay. I beleive that you lose infinity focus because of the large flange on the adapter. If you compare with genuine pentax version, pentax does not have the flange. Although I could be wrong.
07-17-2011, 04:57 PM   #6
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Measure it. M42 is 42MM in diameter. There is a Lieca thread mount that is smaller in diameter at 39MM (M39). Close enough to get confused just by looking. Real old Ashiflex systems used a M37 mount and there was an adapter from M37 to M42. Plenty of M42 to K mount options are available and Pentax makes the best one id needed.

The pin on the lens makes me think it is M42.
07-17-2011, 05:12 PM   #7
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Hard to tell by looking, but T mount is also 42mm, but 42x.75 threads while M42 is 42x1, coarser threads. If it's M42 that adapter should work, but probably will not allow infinity focus, because the flange holds it away from the camera body. T mount adapters have a flange that hold the lens about 5/16" away (a lot thicker than that flange) to allow for the distance to the mirror, which is closer than M42. You can get M42 adapters that will allow infinity focus, no flange. Mine was about $12 and works great.

The pin makes me think M42 as well, but since I haven't seen any T mount lenses I don't know if they have the same pin.
07-17-2011, 05:17 PM   #8
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Please refer to the other thread, you have several answers there already. One is plenty, thanks.

07-17-2011, 05:57 PM   #9
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Hi

That is an M42 lens, but the adapter you have will not allow for infinity focusing as it has a
plate that increases the distance of the lens from the sensor.
As it has been told here many many times and by my own experiments the only sure and safe
adapter is made by Pentax Japan
07-17-2011, 08:44 PM   #10
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QuoteOriginally posted by glee46 Quote
It looks like a M42 mount. It could be a M37, but there is an adapter for that as well, so if you think it's a good buy, then I would go for it.
Very very unlikely to see a non Asahi (3rd party) lens in m37. There were a few German made ones but are more rare than the Asahi-Kogaku-Takumar lenses which aren't very common.
07-17-2011, 11:18 PM   #11
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That flanged adapter will make a 28mm lens pretty unusable (it won't allow focus beyond a few feet). As said, you'd need to buy a Pentax adapter, but this is fairly expensive - which is fine if you intend to buy a lot of M42 lenses (or even just one expensive lens). However, I wouldn't advise it if all you're interested in is this particular lens - note there will be plenty 28mm lenses out there which will outperform it.
07-18-2011, 12:18 AM   #12
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Is it really M42? I need to know it absolutely certainly. My adaptor is ony 5 mm thick. Can someone post me the adaptor from ebay, which works fine?
07-18-2011, 01:49 AM   #13
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QuoteOriginally posted by PedroCZ Quote
Is it really M42? I need to know it absolutely certainly. My adaptor is ony 5 mm thick. Can someone post me the adaptor from ebay, which works fine?
If you can't find a genuine Pentax adapter, this one seems to be a very good alternative (often recommended by Lloydy on this forum!):

M42 lenses on Pentax K
07-18-2011, 01:57 AM   #14
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I've found this one. They say that you are going to be able shooting on infinity focus :
Pentax M42 42mm to PK K Mount K Bayonet Adapter Ring | eBay
07-18-2011, 12:46 PM   #15
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Get Pentax or Fotodiox

QuoteOriginally posted by PedroCZ Quote
I've found this one. They say that you are going to be able shooting on infinity focus :
Pentax M42 42mm to PK K Mount K Bayonet Adapter Ring | eBay
I wouldn't get that one. It looks like it would fall apart the 1st time you use it. Plus the fact it could get stuck on your camera as well. Trust me, you wouldn't want that to happen. Check out Fotodiox. They carry the M42 adapter & I've used it with no problem. I also have the Original Pentax M42 which cost $30. I would go with the Original 1st.

Here's the link to the Fotodiox M42 Adapter. It's $10.95 + @ $4 S/H.
Fotodiox
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