Adaptor for What ?

notsowise · 11-26-2011, 02:09 PM

I purchased a lens case hoping I could use it with one of my cameras, and as a bonus I got an adaptor with it. I would like to know what it is for.
On the side not seen in the photo it has the letters “T-MIN JAPAN “ . It also has m42 threads on it.
The bayonet side pictured is to small to fit a “K” mount.

DeadJohn · 11-26-2011, 02:25 PM

The "T" suggests it might be a t-ring for coupling to a telescope. Some generic long lenses also use t-threads. The threaded end goes onto telescope equipment while the bayonet fits some camera mount.

T-standard and Pentax M42 standard look similar because they are both 42mm. Thread pitches are different, though, so mating a T part with M42 might seem to fit but can bind and damage the threads.

DeadJohn · 11-26-2011, 02:28 PM

heh, I just googled "t-min japan" and only got 2 hits. #1 is this thread. #2 is a porn site.

stevebrot · 11-26-2011, 02:33 PM

That is a T-mount adapter...probably for Minolta ("T-Min" not to be confused with T-Max film). At least it looks like Minolta MC/MD mount to me. The M42 side mates to the lens. It is a different pitch than Praktica/Pentax M42 so don't try to mate the lens directly to an M42 body.

Steve

notsowise · 11-26-2011, 03:19 PM

Originally posted by stevebrot

That is a T-mount adapter...probably for Minolta ("T-Min" not to be confused with T-Max film). At least it looks like Minolta MC/MD mount to me. The M42 side mates to the lens. It is a different pitch than Praktica/Pentax M42 so don't try to mate the lens directly to an M42 body.

Steve

Gatcha

It did screw on a M42 lens without a problem,but it only went on a few threads. Thanks for the input!

**jatrax** · 11-26-2011, 03:59 PM

Originally posted by notsowise

It did screw on a M42 lens without a problem,but it only went on a few threads.

Pentax M42 thread has a pitch of 1mm. T-Mount has a diameter of 42mm but a thread pitch of .75mm. Extremely close but it will damage the threads if forced.

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11-26-2011, 02:09 PM	#1
notsowise Inactive Account Join Date: Jul 2010 Location: Pocahontas, Arkansas Photos: Gallery \| Albums Posts: 52	Adaptor for What ? I purchased a lens case hoping I could use it with one of my cameras, and as a bonus I got an adaptor with it. I would like to know what it is for. On the side not seen in the photo it has the letters “T-MIN JAPAN “ . It also has m42 threads on it. The bayonet side pictured is to small to fit a “K” mount.

11-26-2011, 02:25 PM	#2
DeadJohn Pentaxian Join Date: Jan 2011 Location: New York Posts: 4,834	The "T" suggests it might be a t-ring for coupling to a telescope. Some generic long lenses also use t-threads. The threaded end goes onto telescope equipment while the bayonet fits some camera mount. T-standard and Pentax M42 standard look similar because they are both 42mm. Thread pitches are different, though, so mating a T part with M42 might seem to fit but can bind and damage the threads.

11-26-2011, 02:28 PM	#3
DeadJohn Pentaxian Join Date: Jan 2011 Location: New York Posts: 4,834	heh, I just googled "t-min japan" and only got 2 hits. #1 is this thread. #2 is a porn site.

11-26-2011, 02:33 PM	#4
stevebrot Otis Memorial Pentaxian Join Date: Mar 2007 Location: Vancouver (USA) Photos: Gallery \| Albums Posts: 42,007	That is a T-mount adapter...probably for Minolta ("T-Min" not to be confused with T-Max film). At least it looks like Minolta MC/MD mount to me. The M42 side mates to the lens. It is a different pitch than Praktica/Pentax M42 so don't try to mate the lens directly to an M42 body. Steve

11-26-2011, 03:19 PM	#5
notsowise Inactive Account Join Date: Jul 2010 Location: Pocahontas, Arkansas Photos: Gallery \| Albums Posts: 52 Original Poster	Originally posted by stevebrot That is a T-mount adapter...probably for Minolta ("T-Min" not to be confused with T-Max film). At least it looks like Minolta MC/MD mount to me. The M42 side mates to the lens. It is a different pitch than Praktica/Pentax M42 so don't try to mate the lens directly to an M42 body. Steve Gatcha It did screw on a M42 lens without a problem,but it only went on a few threads. Thanks for the input!

11-26-2011, 03:59 PM	#6
jatrax Site Supporter Join Date: May 2010 Location: Washington Cascades Photos: Gallery \| Albums Posts: 12,991	Originally posted by notsowise It did screw on a M42 lens without a problem,but it only went on a few threads. Pentax M42 thread has a pitch of 1mm. T-Mount has a diameter of 42mm but a thread pitch of .75mm. Extremely close but it will damage the threads if forced.