Mamiya Sekor pin?

HoBykoYan · 07-20-2012, 12:08 AM

Just wondering if there's a pin on the mamiya sekor (m42) lenses?

Was trying 2 mamiya sekor this morning and ready to buy any of the 2 but i can't get it to lock/fit on my K5 (with the m42 adapter). Been using the adapter with my other m42 lenses so this definitely is not the problem...

It seems that there's something that's keeping both lenses to fully rotate on the lock position...

Anyway here are the 2 (m42) lenses:
Mamiya Sekor (Chrome) 55mm 1.8
Mamiya Sekor (Black) 50mm 2

Thanks in advance

glasbak · 07-20-2012, 12:43 AM

Mamiya SX lenses ?
Then there is a compatibiliy problem with the aperture ring.

ronnies · 07-20-2012, 02:26 AM

The M42 Mamiya lenses had a pin on the aperture ring outside the mount which coupled to the camera. That's probably causing the problem.

Ronnie

stevebrot · 07-20-2012, 10:22 PM

Originally posted by ronnies

The M42 Mamiya lenses had a pin on the aperture ring outside the mount which coupled to the camera. That's probably causing the problem.

Ronnie

That should read "Some of the M42 Mamiya Lenses..."

The SX models have a hardware coupler to compatible Mamiya bodies that causes problems when adapting to K-mount cameras. Auto-Mamiya Sekor (non-SX) are standard auto-aperture M42 screw mount and very nicely compatible with all K-mount cameras.

Steve

vonBaloney · 07-20-2012, 10:50 PM

SX-series needs two mods:

1) Get rid of the pin.
2) File down the overhanging aperture ring so the lens can be mounted flush.

ronnies · 07-21-2012, 06:27 AM

Originally posted by stevebrot

That should read "Some of the M42 Mamiya Lenses..."

The SX models have a hardware coupler to compatible Mamiya bodies that causes problems when adapting to K-mount cameras. Auto-Mamiya Sekor (non-SX) are standard auto-aperture M42 screw mount and very nicely compatible with all K-mount cameras.

Steve

Ok, thanks for the correction. :-) It should have read "All the Mamiya M42 lenses I've ever seen..." :-)

Ronnie

stevebrot · 07-21-2012, 07:53 AM

Originally posted by ronnies

Ok, thanks for the correction. :-) It should have read "All the Mamiya M42 lenses I've ever seen..." :-)

Ronnie

I am really not a know-it-all, but misconceptions quite quickly become fact on the Internet and it would be a shame for all M/S lenses (most of which are quite good) to be cast as incompatible in much the same way that all Rikenons have come to bear the stigma of the Ricoh pin!

Steve

vonBaloney · 07-21-2012, 09:07 AM

All m42 Rikenons and Mamiya/Sekors can be used with a little work, some more than others. Many are worth it. I've got a weird optical problem with my M/S SX 55 1.5 -- not sure if it is particular to that lens or just my copy.

stevebrot · 07-21-2012, 12:16 PM

Originally posted by vonBaloney

All m42 Rikenons and Mamiya/Sekors can be used with a little work, some more than others. Many are worth it. I've got a weird optical problem with my M/S SX 55 1.5 -- not sure if it is particular to that lens or just my copy.

What is the "little work", aside from requiring an M42 adapter? Except for requiring an adapter, M42 lenses from these two makers are about as vanilla as they get. That is, with the exception of the M/S SX series.

What I was referring to above is the periodic inquiry where some poor soul is wanting to snip the "dangerous" Ricoh pin off their M42 Auto Rikenon.

Steve

vonBaloney · 07-21-2012, 12:20 PM

Originally posted by stevebrot

What is the "little work", aside from requiring an M42 adapter?

A) Removing pin if necessary (only necessary if it is an actual pin, not a button).

B) Filing down the aperture ring on M/S SXs, as described above.

stevebrot · 07-21-2012, 12:23 PM

Originally posted by vonBaloney

A) Removing pin if necessary (only necessary if it is an actual pin, not a button).

B) Filing down the aperture ring on M/S SXs, as described above.

And the offending pin is only found on the M/S SX lenses. There are no incompatible M42 Rikenons.

vonBaloney · 07-21-2012, 01:30 PM

Originally posted by stevebrot

And the offending pin is only found on the M/S SX lenses. There are no incompatible M42 Rikenons.

Right. Yes, of course -- the pin is on K-mounts.

ronnies · 07-23-2012, 01:53 AM

Originally posted by stevebrot

I am really not a know-it-all <snip>

Sorry, I didn't mean it like that. I genuinely have only ever seen the ones with the pin so didn't know about the others.

Sorry !

Ronnie

HoBykoYan · 07-24-2012, 03:20 AM

Hi All,

Thanks for the replies.
Do we have any pictures on where actually is this pin? can't find it...
Is it easier to file or to remove this Pin?

But before I commit myself on this Pin, is it really worth it? Is it an amazing lens? if its just ordinary then i'll not bother... (I someone here can vouch any of the 2 lenses then i might as well try it out...

Thanks in advance

vonBaloney · 07-24-2012, 09:22 AM

Originally posted by HoBykoYan

Hi All,

Thanks for the replies.
Do we have any pictures on where actually is this pin? can't find it...
Is it easier to file or to remove this Pin?

But before I commit myself on this Pin, is it really worth it? Is it an amazing lens? if its just ordinary then i'll not bother... (I someone here can vouch any of the 2 lenses then i might as well try it out...

Thanks in advance

If it is not an SX, it probably doesn't have a pin. I've just yanked them out with needle-nose pilers rather than disassembling anything -- takes two seconds -- shears right off. Some might find that reckless. Do at your own risk.

If it is an SX, the FAR bigger pain is filing down the aperture ring so it is flush. That's a decent amount of work...

07-20-2012, 12:08 AM	#1
HoBykoYan Senior Member Join Date: Jan 2010 Location: HCMC Posts: 271	Mamiya Sekor pin? Just wondering if there's a pin on the mamiya sekor (m42) lenses? Was trying 2 mamiya sekor this morning and ready to buy any of the 2 but i can't get it to lock/fit on my K5 (with the m42 adapter). Been using the adapter with my other m42 lenses so this definitely is not the problem... It seems that there's something that's keeping both lenses to fully rotate on the lock position... Anyway here are the 2 (m42) lenses: Mamiya Sekor (Chrome) 55mm 1.8 Mamiya Sekor (Black) 50mm 2 Thanks in advance

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07-20-2012, 12:43 AM	#2
glasbak Veteran Member Join Date: Apr 2009 Location: Netherlands Posts: 369	Mamiya SX lenses ? Then there is a compatibiliy problem with the aperture ring.

07-20-2012, 02:26 AM	#3
ronnies Forum Member Join Date: Jul 2011 Location: Edinburgh Posts: 73	The M42 Mamiya lenses had a pin on the aperture ring outside the mount which coupled to the camera. That's probably causing the problem. Ronnie

07-20-2012, 10:22 PM	#4
stevebrot Otis Memorial Pentaxian Join Date: Mar 2007 Location: Vancouver (USA) Photos: Gallery \| Albums Posts: 42,007	Originally posted by ronnies The M42 Mamiya lenses had a pin on the aperture ring outside the mount which coupled to the camera. That's probably causing the problem. Ronnie That should read "Some of the M42 Mamiya Lenses..." The SX models have a hardware coupler to compatible Mamiya bodies that causes problems when adapting to K-mount cameras. Auto-Mamiya Sekor (non-SX) are standard auto-aperture M42 screw mount and very nicely compatible with all K-mount cameras. Steve

07-20-2012, 10:50 PM	#5
vonBaloney Pentaxian Join Date: Oct 2011 Location: Albuquerque, NM Posts: 6,029	SX-series needs two mods: 1) Get rid of the pin. 2) File down the overhanging aperture ring so the lens can be mounted flush.

07-21-2012, 06:27 AM	#6
ronnies Forum Member Join Date: Jul 2011 Location: Edinburgh Posts: 73	Originally posted by stevebrot That should read "Some of the M42 Mamiya Lenses..." The SX models have a hardware coupler to compatible Mamiya bodies that causes problems when adapting to K-mount cameras. Auto-Mamiya Sekor (non-SX) are standard auto-aperture M42 screw mount and very nicely compatible with all K-mount cameras. Steve Ok, thanks for the correction. :-) It should have read "All the Mamiya M42 lenses I've ever seen..." :-) Ronnie

07-21-2012, 07:53 AM	#7
stevebrot Otis Memorial Pentaxian Join Date: Mar 2007 Location: Vancouver (USA) Photos: Gallery \| Albums Posts: 42,007	Originally posted by ronnies Ok, thanks for the correction. :-) It should have read "All the Mamiya M42 lenses I've ever seen..." :-) Ronnie I am really not a know-it-all, but misconceptions quite quickly become fact on the Internet and it would be a shame for all M/S lenses (most of which are quite good) to be cast as incompatible in much the same way that all Rikenons have come to bear the stigma of the Ricoh pin! Steve

07-21-2012, 09:07 AM	#8
vonBaloney Pentaxian Join Date: Oct 2011 Location: Albuquerque, NM Posts: 6,029	All m42 Rikenons and Mamiya/Sekors can be used with a little work, some more than others. Many are worth it. I've got a weird optical problem with my M/S SX 55 1.5 -- not sure if it is particular to that lens or just my copy.

07-21-2012, 12:16 PM	#9
stevebrot Otis Memorial Pentaxian Join Date: Mar 2007 Location: Vancouver (USA) Photos: Gallery \| Albums Posts: 42,007	Originally posted by vonBaloney All m42 Rikenons and Mamiya/Sekors can be used with a little work, some more than others. Many are worth it. I've got a weird optical problem with my M/S SX 55 1.5 -- not sure if it is particular to that lens or just my copy. What is the "little work", aside from requiring an M42 adapter? Except for requiring an adapter, M42 lenses from these two makers are about as vanilla as they get. That is, with the exception of the M/S SX series. What I was referring to above is the periodic inquiry where some poor soul is wanting to snip the "dangerous" Ricoh pin off their M42 Auto Rikenon. Steve

07-21-2012, 12:20 PM	#10
vonBaloney Pentaxian Join Date: Oct 2011 Location: Albuquerque, NM Posts: 6,029	Originally posted by stevebrot What is the "little work", aside from requiring an M42 adapter? A) Removing pin if necessary (only necessary if it is an actual pin, not a button). B) Filing down the aperture ring on M/S SXs, as described above.

07-21-2012, 12:23 PM	#11
stevebrot Otis Memorial Pentaxian Join Date: Mar 2007 Location: Vancouver (USA) Photos: Gallery \| Albums Posts: 42,007	Originally posted by vonBaloney A) Removing pin if necessary (only necessary if it is an actual pin, not a button). B) Filing down the aperture ring on M/S SXs, as described above. And the offending pin is only found on the M/S SX lenses. There are no incompatible M42 Rikenons.

07-21-2012, 01:30 PM	#12
vonBaloney Pentaxian Join Date: Oct 2011 Location: Albuquerque, NM Posts: 6,029	Originally posted by stevebrot And the offending pin is only found on the M/S SX lenses. There are no incompatible M42 Rikenons. Right. Yes, of course -- the pin is on K-mounts.

07-23-2012, 01:53 AM	#13
ronnies Forum Member Join Date: Jul 2011 Location: Edinburgh Posts: 73	Originally posted by stevebrot I am really not a know-it-all <snip> Sorry, I didn't mean it like that. I genuinely have only ever seen the ones with the pin so didn't know about the others. Sorry ! Ronnie

07-24-2012, 03:20 AM	#14
HoBykoYan Senior Member Join Date: Jan 2010 Location: HCMC Posts: 271 Original Poster	Hi All, Thanks for the replies. Do we have any pictures on where actually is this pin? can't find it... Is it easier to file or to remove this Pin? But before I commit myself on this Pin, is it really worth it? Is it an amazing lens? if its just ordinary then i'll not bother... (I someone here can vouch any of the 2 lenses then i might as well try it out... Thanks in advance

07-24-2012, 09:22 AM	#15
vonBaloney Pentaxian Join Date: Oct 2011 Location: Albuquerque, NM Posts: 6,029	Originally posted by HoBykoYan Hi All, Thanks for the replies. Do we have any pictures on where actually is this pin? can't find it... Is it easier to file or to remove this Pin? But before I commit myself on this Pin, is it really worth it? Is it an amazing lens? if its just ordinary then i'll not bother... (I someone here can vouch any of the 2 lenses then i might as well try it out... Thanks in advance If it is not an SX, it probably doesn't have a pin. I've just yanked them out with needle-nose pilers rather than disassembling anything -- takes two seconds -- shears right off. Some might find that reckless. Do at your own risk. If it is an SX, the FAR bigger pain is filing down the aperture ring so it is flush. That's a decent amount of work...