The M42 Crew

**pacerr** · 07-27-2010, 08:25 AM

Originally posted by bbluesman

This image was a vivid reminder of the days of Kodak Pan, Plus and Tri-X film and trying to deal with the positive and negative aspects of the then new-to-me TTL metering with a Spotmatic.

More often than not, I had better results in this sort of high contrast situation by metering off of a typical subject (a hand?) and pre-setting the exposure than I did with dynamic TTL metering. I believe this was because the center-averaging exposure was constantly re-calculating the scene rather than than the desired subject.

Although I thought TTL metering for close-ups and extension tubes/bellows work was magic, it was my habit to use predictive, manual metering for this sort of scene and it remains my habit even today with DSLR's. I see no reason to allow TTL metering to mess up a perfectly good exposure calculation and the histogram and instant review take all the guess work out of the prediction.

With post-processing able to salvage both highlights and shadows now it's even better IMO.

H2

clark · 07-27-2010, 09:31 AM

just got 2 quick questions about using m42 on pentax DSLR's

1- does the aperture only close down just before the shot is taken?
2- how does metering work, does it work just the same as when using k mount glass? (i.e. AE-L/green button)

Nesster · 07-27-2010, 10:57 AM

1 - no, there is no aperture linkage for M42's on a K mount. Instead, you put your lens on the 'M' mode - turning the aperture ring directly stops down the aperture - and...

2 - you may use Av mode (usually with exposure compensation) to let the camera set the shutter speed at your chosen (manually stopped down) aperture, or you may use the green button to do a manual reading.

georgweb · 07-28-2010, 09:51 AM

Originally posted by Nesster

Thanks, Georg - I've never used an Enna, they look like good lenses. Is that a statue or a person?

That's a statue. The (M42) Enna lenses are quite good from the full-metal era (similar to Schneider and Stäble).
They changed to all-plastic in the 70s. Still good, but tend to fog up inside from some of that plastic.

M42 czj mc flektogon 35/2.4 @2.4 on K100D

ducdao · 08-21-2010, 04:13 AM

Let's revive this thread a bit. Here are a couple from my Fujinon (non EBC version) 50/f1.4. Taken wide open

Does anyone know the difference between EBC and non-EBC? Mine doesn't have the A/M switch so I can only use it wide open until it gets modified.

AlexanderMayorov · 08-21-2010, 05:03 PM

Pentax K-7 + Helios 44-6

georgweb · 08-22-2010, 08:24 AM

Great portrait Alexander, well done! The Helios seems to work fine with any camera. Is there any pp on this photo?

Here's an unprocessed and uncropped photo. However, since transferring it through Picasa (incl. resize) there is some sharpening involved for sure.

M42 Mamiya Sekor SX 2.8 28mm + cheap polarizer on K100D, f/11, 1/80s. ISO200

sherwood · 08-22-2010, 08:41 AM

Good shot ! The guitarist's energy is in high contrast with some people sitting on the left. I really love the amp on the trunk, but the tree probably doesn't !

georgweb · 08-22-2010, 08:48 AM

Thanks for the comment. The tree was shaking its leaves in extasy .-)

sherwood · 08-22-2010, 08:50 AM

Caught this one yesterday with Helios-44-M-4

AlexanderMayorov · 08-22-2010, 01:26 PM

http://img413.imageshack.us/img413/466/1pnt9584.jpg

Blue · 08-22-2010, 01:29 PM

Originally posted by georgweb

. . .
M42 Mamiya Sekor SX 2.8 28mm + cheap polarizer on K100D, f/11, 1/80s. ISO200

What is your chosen method to deal with the auto aperture pin?

JohnBee · 08-22-2010, 01:39 PM

Originally posted by Nesster

Thanks, Georg - I've never used an Enna, they look like good lenses. Is that a statue or a person?

Komura 135mm f/2.3, K100D

Very impressive!
I never would have thought given my own experiences with other Koumra lenses.

georgweb · 08-22-2010, 04:59 PM - **1 Like**

Originally posted by AlexanderMayorov

http://img413.imageshack.us/img413/466/1pnt9584.jpg

Alexander, I reckon you have posted the original pic without postprocess? If so, that is really impressive.

Originally posted by Blue

What is your chosen method to deal with the auto aperture pin?

My chosen method is the cotton shaft method very well pictured by user Mel here, https://www.pentaxforums.com/forums/pentax-slr-lens-discussion/77158-caution-...tml#post862052. Sometimes though it is not
so easy to free the pin from the mechanism, as with the 28. Here, I have slitted the shaft lenghtwise (a parallel cut is much better than diagonal) and popped it
onto the pin inside. Good enough for me, but you could alternatively wrap some wire around the pin and twist and cut. I hope that's what you have been asking for.

M42 Mamiya Sekor SX 2.8 28mm + cheap polarizer on K100D, f/11, 1/125s. no crop no pp ISO200

Blue · 08-22-2010, 07:26 PM

Originally posted by georgweb

. . .

My chosen method is the cotton shaft method very well pictured by user Mel here, https://www.pentaxforums.com/forums/pentax-slr-lens-discussion/77158-caution-...tml#post862052. Sometimes though it is not
so easy to free the pin from the mechanism, as with the 28. Here, I have slitted the shaft lenghtwise (a parallel cut is much better than diagonal) and popped it
onto the pin inside. Good enough for me, but you could alternatively wrap some wire around the pin and twist and cut. I hope that's what you have been asking for.

M42 Mamiya Sekor SX 2.8 28mm + cheap polarizer on K100D, f/11, 1/125s. no crop no pp ISO200

That's what I was looking for.

I don't want to Super Glue it and I haven't decided if I want to spend $42 on the special m42 adapter for it.

Edit: That is one interesting boat!

07-27-2010, 08:25 AM	#181
pacerr Loyal Site Supporter Join Date: Jan 2008 Location: Paris, TN Photos: Gallery \| Albums Posts: 3,349	Flashback Originally posted by bbluesman This image was a vivid reminder of the days of Kodak Pan, Plus and Tri-X film and trying to deal with the positive and negative aspects of the then new-to-me TTL metering with a Spotmatic. More often than not, I had better results in this sort of high contrast situation by metering off of a typical subject (a hand?) and pre-setting the exposure than I did with dynamic TTL metering. I believe this was because the center-averaging exposure was constantly re-calculating the scene rather than than the desired subject. Although I thought TTL metering for close-ups and extension tubes/bellows work was magic, it was my habit to use predictive, manual metering for this sort of scene and it remains my habit even today with DSLR's. I see no reason to allow TTL metering to mess up a perfectly good exposure calculation and the histogram and instant review take all the guess work out of the prediction. With post-processing able to salvage both highlights and shadows now it's even better IMO. H2

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07-27-2010, 09:31 AM	#182
clark Inactive Account Join Date: Jun 2010 Posts: 301	just got 2 quick questions about using m42 on pentax DSLR's 1- does the aperture only close down just before the shot is taken? 2- how does metering work, does it work just the same as when using k mount glass? (i.e. AE-L/green button)

07-27-2010, 10:57 AM	#183
Nesster Veteran Member Join Date: Oct 2006 Location: NJ USA Photos: Gallery Posts: 13,072 Original Poster	1 - no, there is no aperture linkage for M42's on a K mount. Instead, you put your lens on the 'M' mode - turning the aperture ring directly stops down the aperture - and... 2 - you may use Av mode (usually with exposure compensation) to let the camera set the shutter speed at your chosen (manually stopped down) aperture, or you may use the green button to do a manual reading.

07-28-2010, 09:51 AM	#184
georgweb Veteran Member Join Date: Apr 2008 Location: Berlin, Germany Photos: Gallery Posts: 1,386	Originally posted by Nesster Thanks, Georg - I've never used an Enna, they look like good lenses. Is that a statue or a person? That's a statue. The (M42) Enna lenses are quite good from the full-metal era (similar to Schneider and Stäble). They changed to all-plastic in the 70s. Still good, but tend to fog up inside from some of that plastic. M42 czj mc flektogon 35/2.4 @2.4 on K100D

08-21-2010, 04:13 AM	#185
ducdao Pentaxian Join Date: Dec 2009 Location: Montreal/Vermont Posts: 2,160	Let's revive this thread a bit. Here are a couple from my Fujinon (non EBC version) 50/f1.4. Taken wide open Does anyone know the difference between EBC and non-EBC? Mine doesn't have the A/M switch so I can only use it wide open until it gets modified.

08-21-2010, 05:03 PM	#186
AlexanderMayorov Veteran Member Join Date: Oct 2008 Location: Istanbul Photos: Gallery Posts: 466	Pentax K-7 + Helios 44-6

08-22-2010, 08:24 AM	#187
georgweb Veteran Member Join Date: Apr 2008 Location: Berlin, Germany Photos: Gallery Posts: 1,386	Great portrait Alexander, well done! The Helios seems to work fine with any camera. Is there any pp on this photo? Here's an unprocessed and uncropped photo. However, since transferring it through Picasa (incl. resize) there is some sharpening involved for sure. M42 Mamiya Sekor SX 2.8 28mm + cheap polarizer on K100D, f/11, 1/80s. ISO200

08-22-2010, 08:41 AM	#188
sherwood Forum Member Join Date: Aug 2010 Location: Belgium Photos: Albums Posts: 60	Good shot ! The guitarist's energy is in high contrast with some people sitting on the left. I really love the amp on the trunk, but the tree probably doesn't !

08-22-2010, 08:48 AM	#189
georgweb Veteran Member Join Date: Apr 2008 Location: Berlin, Germany Photos: Gallery Posts: 1,386	Thanks for the comment. The tree was shaking its leaves in extasy .-)

08-22-2010, 01:26 PM	#191
AlexanderMayorov Veteran Member Join Date: Oct 2008 Location: Istanbul Photos: Gallery Posts: 466	http://img413.imageshack.us/img413/466/1pnt9584.jpg

08-22-2010, 01:29 PM	#192
Blue Moderator Site Supporter Join Date: Jun 2008 Location: Florida Hill Country Photos: Gallery \| Albums Posts: 17,377	Originally posted by georgweb . . . M42 Mamiya Sekor SX 2.8 28mm + cheap polarizer on K100D, f/11, 1/80s. ISO200 What is your chosen method to deal with the auto aperture pin?

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08-22-2010, 01:39 PM	#193
JohnBee Veteran Member Join Date: Sep 2008 Location: Newrfoundland Photos: Albums Posts: 4,667	Originally posted by Nesster Thanks, Georg - I've never used an Enna, they look like good lenses. Is that a statue or a person? Komura 135mm f/2.3, K100D Very impressive! I never would have thought given my own experiences with other Koumra lenses.

08-22-2010, 04:59 PM - 1 Like	#194
georgweb Veteran Member Join Date: Apr 2008 Location: Berlin, Germany Photos: Gallery Posts: 1,386	Originally posted by AlexanderMayorov http://img413.imageshack.us/img413/466/1pnt9584.jpg Alexander, I reckon you have posted the original pic without postprocess? If so, that is really impressive. Originally posted by Blue What is your chosen method to deal with the auto aperture pin? My chosen method is the cotton shaft method very well pictured by user Mel here, https://www.pentaxforums.com/forums/pentax-slr-lens-discussion/77158-caution-...tml#post862052. Sometimes though it is not so easy to free the pin from the mechanism, as with the 28. Here, I have slitted the shaft lenghtwise (a parallel cut is much better than diagonal) and popped it onto the pin inside. Good enough for me, but you could alternatively wrap some wire around the pin and twist and cut. I hope that's what you have been asking for. M42 Mamiya Sekor SX 2.8 28mm + cheap polarizer on K100D, f/11, 1/125s. no crop no pp ISO200

08-22-2010, 07:26 PM	#195
Blue Moderator Site Supporter Join Date: Jun 2008 Location: Florida Hill Country Photos: Gallery \| Albums Posts: 17,377	Originally posted by georgweb . . . My chosen method is the cotton shaft method very well pictured by user Mel here, https://www.pentaxforums.com/forums/pentax-slr-lens-discussion/77158-caution-...tml#post862052. Sometimes though it is not so easy to free the pin from the mechanism, as with the 28. Here, I have slitted the shaft lenghtwise (a parallel cut is much better than diagonal) and popped it onto the pin inside. Good enough for me, but you could alternatively wrap some wire around the pin and twist and cut. I hope that's what you have been asking for. M42 Mamiya Sekor SX 2.8 28mm + cheap polarizer on K100D, f/11, 1/125s. no crop no pp ISO200 That's what I was looking for. I don't want to Super Glue it and I haven't decided if I want to spend $42 on the special m42 adapter for it. Edit: That is one interesting boat!