No noise from the Green Button

kentishrev · 09-20-2014, 11:02 AM

I'm not sure I have a problem or not......

I've had my K-30 for around a year. About six months ago I bought my first M lens (the M 135mm). Having asked on here how best to use it, I was made aware of the Pentax miracle that is the 'Green Button'. With my lens on, and the dial set to M, I composed the photograph, pressed the Green Button, and then took my picture. When I pressed the Button, there was a definite noise, I think from the lens, that sounded a little like a shutter click, or a scissor-click, but was, I thought, the aperture blades being moved by the camera.

Recently however I have bought some additional M lenses. I noticed that the Green Button no longer produced the 'scissor click' that I'd heard before. And some of the pictures seem over-exposed.

Perhaps it was just different lenses, so I put the 135mm back on. And there is no longer a 'scissor-click' from that one either.

Does this make sense to anyone? Should there ever have been a 'scissor-click'? Should there be one now?

many thanks,

JohnX · 09-20-2014, 11:12 AM

I don't have any M lenses, but as I understand it the green button should stop the lens down to whatever aperture you're set. If you set your lens aperture to a mid point, turn the camera around so you can see into the lens then operate the green button you should see the lens stop down.

Could be there are other camera settings to enable stop down, etc.

Adam · 09-20-2014, 11:27 AM - **1 Like**

Originally posted by kentishrev

I'm not sure I have a problem or not......

I've had my K-30 for around a year. About six months ago I bought my first M lens (the M 135mm). Having asked on here how best to use it, I was made aware of the Pentax miracle that is the 'Green Button'. With my lens on, and the dial set to M, I composed the photograph, pressed the Green Button, and then took my picture. When I pressed the Button, there was a definite noise, I think from the lens, that sounded a little like a shutter click, or a scissor-click, but was, I thought, the aperture blades being moved by the camera.

Recently however I have bought some additional M lenses. I noticed that the Green Button no longer produced the 'scissor click' that I'd heard before. And some of the pictures seem over-exposed.

Perhaps it was just different lenses, so I put the 135mm back on. And there is no longer a 'scissor-click' from that one either.

Does this make sense to anyone? Should there ever have been a 'scissor-click'? Should there be one now?

many thanks,

Is the green button still mapped to "Tv Shift" in M mode? Check your customization settings. If it isn't (it could have been reset by firmware for instance), then that would be the explanation. Also, if you set your lens to wide-open, it won't make as much noise when the camera tries to stop down.

manntax · 09-20-2014, 11:43 AM - **1 Like**

Check the ISO - it should be set to one fixed value ( e.g. ISO 100 ) not to AUTO .

kentishrev · 09-20-2014, 02:10 PM

Thank you to all of you. It was a combination of the three comments - it wasn't stopping down, then I found the Green Button had reset (quite possibly last time I updated the firmware). And the all important ISO was on Auto. Corrected all points - and that scissor-slice noise is back (and the colours, if not composition, are better again). Many thanks.

manntax · 09-20-2014, 02:43 PM

Glad I was of some help to a fellow Pentaxian ! Happy shooting

09-20-2014, 11:02 AM	#1
kentishrev Senior Member Join Date: Jan 2014 Posts: 180	No noise from the Green Button I'm not sure I have a problem or not...... I've had my K-30 for around a year. About six months ago I bought my first M lens (the M 135mm). Having asked on here how best to use it, I was made aware of the Pentax miracle that is the 'Green Button'. With my lens on, and the dial set to M, I composed the photograph, pressed the Green Button, and then took my picture. When I pressed the Button, there was a definite noise, I think from the lens, that sounded a little like a shutter click, or a scissor-click, but was, I thought, the aperture blades being moved by the camera. Recently however I have bought some additional M lenses. I noticed that the Green Button no longer produced the 'scissor click' that I'd heard before. And some of the pictures seem over-exposed. Perhaps it was just different lenses, so I put the 135mm back on. And there is no longer a 'scissor-click' from that one either. Does this make sense to anyone? Should there ever have been a 'scissor-click'? Should there be one now? many thanks,

09-20-2014, 11:27 AM - 1 Like	#3
Adam Administrator Site Webmaster Join Date: Sep 2006 Location: Arizona Photos: Gallery \| Albums Posts: 51,595	Originally posted by kentishrev I'm not sure I have a problem or not...... I've had my K-30 for around a year. About six months ago I bought my first M lens (the M 135mm). Having asked on here how best to use it, I was made aware of the Pentax miracle that is the 'Green Button'. With my lens on, and the dial set to M, I composed the photograph, pressed the Green Button, and then took my picture. When I pressed the Button, there was a definite noise, I think from the lens, that sounded a little like a shutter click, or a scissor-click, but was, I thought, the aperture blades being moved by the camera. Recently however I have bought some additional M lenses. I noticed that the Green Button no longer produced the 'scissor click' that I'd heard before. And some of the pictures seem over-exposed. Perhaps it was just different lenses, so I put the 135mm back on. And there is no longer a 'scissor-click' from that one either. Does this make sense to anyone? Should there ever have been a 'scissor-click'? Should there be one now? many thanks, Is the green button still mapped to "Tv Shift" in M mode? Check your customization settings. If it isn't (it could have been reset by firmware for instance), then that would be the explanation. Also, if you set your lens to wide-open, it won't make as much noise when the camera tries to stop down. Adam PentaxForums.com Webmaster (Site Usage Guide \| Site Help \| My Photography) PentaxForums.com server and development costs are user-supported. You can help cover these costs by donating or purchasing one of our Pentax eBooks. Or, buy your photo gear from our affiliates, Adorama, B&H Photo, KEH, or Topaz Labs, and get FREE Marketplace access - click here to see how! Trusted Pentax retailers:

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09-20-2014, 11:12 AM	#2
JohnX Pentaxian Join Date: Jul 2009 Location: London Posts: 1,116	I don't have any M lenses, but as I understand it the green button should stop the lens down to whatever aperture you're set. If you set your lens aperture to a mid point, turn the camera around so you can see into the lens then operate the green button you should see the lens stop down. Could be there are other camera settings to enable stop down, etc.

09-20-2014, 11:43 AM - 1 Like	#4
manntax Veteran Member Join Date: Jan 2012 Photos: Albums Posts: 1,972	Check the ISO - it should be set to one fixed value ( e.g. ISO 100 ) not to AUTO .

09-20-2014, 02:10 PM	#5
kentishrev Senior Member Join Date: Jan 2014 Posts: 180 Original Poster	Thank you to all of you. It was a combination of the three comments - it wasn't stopping down, then I found the Green Button had reset (quite possibly last time I updated the firmware). And the all important ISO was on Auto. Corrected all points - and that scissor-slice noise is back (and the colours, if not composition, are better again). Many thanks.

09-20-2014, 02:43 PM	#6
manntax Veteran Member Join Date: Jan 2012 Photos: Albums Posts: 1,972	Glad I was of some help to a fellow Pentaxian ! Happy shooting