Lens question on K-01

**paulpines** · 06-28-2016, 12:02 AM

Hello all,

Whenever I'm using my K-01 the aperture blades on digital lenses start to open and close for no apparent reason. I'll be walking and I hear them. It also happens when I'm moving from a dark place to a brightly lit place. Is this behaviour normal? Is it something in the settings? Is it the CDAF?

I generally use the XS 40mm, DA 35, and DA 50. This obviously does not happen with manual glass.

Any ideas?

Thanks

pathdoc · 06-28-2016, 12:23 AM

What are your current settings? Does it happen if you select manual mode?

Steve.Ledger · 06-28-2016, 12:41 AM

It's normal if you have Auto Exposure enabled. Hit the AE-L button while you walking about, that stops it. Then tap it again when ready to shoot.
(Or pop on the lens cap)
Not unique to the K-01 but it's loud enough to be damned irritating. I really hated it when I had one.

Adam · 06-28-2016, 12:52 AM

Originally posted by paulpines

Hello all,

Whenever I'm using my K-01 the aperture blades on digital lenses start to open and close for no apparent reason. I'll be walking and I hear them. It also happens when I'm moving from a dark place to a brightly lit place. Is this behaviour normal? Is it something in the settings? Is it the CDAF?

I generally use the XS 40mm, DA 35, and DA 50. This obviously does not happen with manual glass.

Any ideas?

Thanks

Yup, it's normal unfortunately. The camera has a mind of its own and may or may not use the aperture to control live view exposure.

Adam
PentaxForums.com Webmaster (Site Usage Guide | Site Help | My Photography)

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lytrytyr · 06-28-2016, 07:33 AM

Originally posted by paulpines

Whenever I'm using my K-01 the aperture blades on digital lenses start to open and close for no apparent reason.
Any ideas?

The little squirrels inside the K-01 are usually busy managing the screen brightness,
in part to help conserve battery power, and maybe to prolong the life of the screen.
So these aperture changes are one way they can help to do that.
Another function of the aperture changes is to protect the sensor,
which of course is open to the light all the time the camera is operating.

My advice would be to only have the camera turned on
when you're actually in the process of taking a photograph,
whatever mode you happen to have selected.

Steve.Ledger · 06-28-2016, 08:38 PM

Originally posted by lytrytyr

My advice would be to only have the camera turned on
when you're actually in the process of taking a photograph,
whatever mode you happen to have selected.

You may not be understanding the issue fully. When taking a series of photos you only need to move the camera slightly to point it at a different light level for the scraping blades sound to occur. You're certainly not going to keep switching the camera on and off again for photos you're taking ever few seconds.
It's a real issue and it was an exceedingly irritating one. I don't miss selling the K-01 at all.

pentaxian_tmb · 06-29-2016, 07:32 AM

Quote:

ou may not be understanding the issue fully. When taking a series of photos you only need to move the camera slightly to point it at a different light level for the scraping blades sound to occur.

Well, right. If you are in any auto-exposure mode the camera is going to be constantly adjusting the aperture blades based on the light source. That is how my K-01 works.

**paulpines** · 06-29-2016, 05:53 PM

Thanks for all the responses. I'm learning a lot!!

fwcetus · 07-01-2016, 06:21 AM

Originally posted by Steve.Ledger

You may not be understanding the issue fully. When taking a series of photos you only need to move the camera slightly to point it at a different light level for the scraping blades sound to occur. [...] I don't miss selling the K-01 at all.

Hmmm... For me, it's ~different~ from using a DSLR, but not annoying -- I see it more as part of the K-01's "character".

Perhaps if I were using the K-01 as my primary body I might feel different (since I use a K-3 most of the time and only occasionally use the K-01).

**Scorpio71GR** · 07-01-2016, 07:10 AM

I avoid this issue by using my K -01 is M mode. Manual mode is essentially like TAv mode on a DSLR. The K-01 has its quirks but you can work around them.

Fat Albert · 07-01-2016, 07:13 AM

Originally posted by Steve.Ledger

It's a real issue and it was an exceedingly irritating one. I don't miss selling the K-01 at all.

It bothered you that much, eh?

Steve.Ledger · 07-01-2016, 01:20 PM

Originally posted by Fat Albert

It bothered you that much, eh?

It was certainly a factor, but not the reason - I sold every bit of Pentax gear I had to move over to MFT

**paulpines** · 07-04-2016, 04:48 PM

Originally posted by Scorpio71GR

I avoid this issue by using my K -01 is M mode. Manual mode is essentially like TAv mode on a DSLR. The K-01 has its quirks but you can work around them.

I took it out for a spin on the weekend, and it does it in manual as well

---------- Post added 07-04-16 at 07:57 PM ----------

Originally posted by Steve.Ledger

It's normal if you have Auto Exposure enabled. Hit the AE-L button while you walking about, that stops it. Then tap it again when ready to shoot.

This however did work for me. So I may have to use this "feature"

PiDicus Rex · 08-15-2016, 07:31 AM

Originally posted by Steve.Ledger

I sold every bit of Pentax gear I had to move over to MFT

Lolz

I'm filming on GH-4 this week,... using K-mount lenses,... Why not just buy a mount adapter Steve?

@ Paul Pines - yup, completely normal, just one of the ways the K-01 operates to give a balanced preview image on the LCD.
If you have a full manual lens on the camera, or the Iris ring turned to stop down the metering, you can press the +/- button to simulated the same action to preview the exposure.
Personally, never found it annoying, but I shoot video more then stills and use K-A and K-M lenses most of the time, so I know I'm not normal, even among Pentaxians.

Steve.Ledger · 08-15-2016, 12:27 PM

Originally posted by PiDicus Rex

Lolz

I'm filming on GH-4 this week,... using K-mount lenses,... Why not just buy a mount adapter Steve?.

That would be rather silly of me to move to a smaller ILC camera system only to wack a huge lens with adapter onto it.

I feel the Oly lenses I have now are better than the Pentax lenses I had. Especially the 45mm F1.8 prime. I think it's coated with magic.

06-28-2016, 12:02 AM	#1
paulpines Site Supporter Join Date: Apr 2014 Location: Toronto Posts: 64	Lens question on K-01 Hello all, Whenever I'm using my K-01 the aperture blades on digital lenses start to open and close for no apparent reason. I'll be walking and I hear them. It also happens when I'm moving from a dark place to a brightly lit place. Is this behaviour normal? Is it something in the settings? Is it the CDAF? I generally use the XS 40mm, DA 35, and DA 50. This obviously does not happen with manual glass. Any ideas? Thanks

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06-28-2016, 12:23 AM	#2
pathdoc Pentaxian Join Date: Mar 2015 Photos: Gallery \| Albums Posts: 6,381	What are your current settings? Does it happen if you select manual mode?

06-28-2016, 12:41 AM	#3
Steve.Ledger Veteran Member Join Date: Oct 2009 Location: Far North Qld Posts: 3,301	It's normal if you have Auto Exposure enabled. Hit the AE-L button while you walking about, that stops it. Then tap it again when ready to shoot. (Or pop on the lens cap) Not unique to the K-01 but it's loud enough to be damned irritating. I really hated it when I had one.

06-28-2016, 12:52 AM	#4
Adam Administrator Site Webmaster Join Date: Sep 2006 Location: Arizona Photos: Gallery \| Albums Posts: 51,595	Originally posted by paulpines Hello all, Whenever I'm using my K-01 the aperture blades on digital lenses start to open and close for no apparent reason. I'll be walking and I hear them. It also happens when I'm moving from a dark place to a brightly lit place. Is this behaviour normal? Is it something in the settings? Is it the CDAF? I generally use the XS 40mm, DA 35, and DA 50. This obviously does not happen with manual glass. Any ideas? Thanks Yup, it's normal unfortunately. The camera has a mind of its own and may or may not use the aperture to control live view exposure. 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:

06-28-2016, 07:33 AM	#5
lytrytyr Pentaxian Join Date: Nov 2011 Photos: Gallery \| Albums Posts: 4,310	Originally posted by paulpines Whenever I'm using my K-01 the aperture blades on digital lenses start to open and close for no apparent reason. Any ideas? The little squirrels inside the K-01 are usually busy managing the screen brightness, in part to help conserve battery power, and maybe to prolong the life of the screen. So these aperture changes are one way they can help to do that. Another function of the aperture changes is to protect the sensor, which of course is open to the light all the time the camera is operating. My advice would be to only have the camera turned on when you're actually in the process of taking a photograph, whatever mode you happen to have selected.

06-28-2016, 08:38 PM	#6
Steve.Ledger Veteran Member Join Date: Oct 2009 Location: Far North Qld Posts: 3,301	Originally posted by lytrytyr My advice would be to only have the camera turned on when you're actually in the process of taking a photograph, whatever mode you happen to have selected. You may not be understanding the issue fully. When taking a series of photos you only need to move the camera slightly to point it at a different light level for the scraping blades sound to occur. You're certainly not going to keep switching the camera on and off again for photos you're taking ever few seconds. It's a real issue and it was an exceedingly irritating one. I don't miss selling the K-01 at all.

06-29-2016, 07:32 AM	#7
pentaxian_tmb Pentaxian Join Date: Aug 2009 Location: Madison, Wisconsin Posts: 436	Quote: ou may not be understanding the issue fully. When taking a series of photos you only need to move the camera slightly to point it at a different light level for the scraping blades sound to occur. Well, right. If you are in any auto-exposure mode the camera is going to be constantly adjusting the aperture blades based on the light source. That is how my K-01 works.

06-29-2016, 05:53 PM	#8
paulpines Site Supporter Join Date: Apr 2014 Location: Toronto Posts: 64 Original Poster	Thanks for all the responses. I'm learning a lot!!

07-01-2016, 06:21 AM	#9
fwcetus Site Supporter Join Date: Sep 2006 Location: New England Photos: Gallery \| Albums Posts: 1,286	Originally posted by Steve.Ledger You may not be understanding the issue fully. When taking a series of photos you only need to move the camera slightly to point it at a different light level for the scraping blades sound to occur. [...] I don't miss selling the K-01 at all. Hmmm... For me, it's ~different~ from using a DSLR, but not annoying -- I see it more as part of the K-01's "character". Perhaps if I were using the K-01 as my primary body I might feel different (since I use a K-3 most of the time and only occasionally use the K-01).

07-01-2016, 07:10 AM	#10
Scorpio71GR Loyal Site Supporter Join Date: Nov 2014 Location: Michigan Photos: Gallery \| Albums Posts: 6,005	I avoid this issue by using my K -01 is M mode. Manual mode is essentially like TAv mode on a DSLR. The K-01 has its quirks but you can work around them.

07-01-2016, 07:13 AM	#11
Fat Albert Veteran Member Join Date: Jul 2013 Posts: 966	Originally posted by Steve.Ledger It's a real issue and it was an exceedingly irritating one. I don't miss selling the K-01 at all. It bothered you that much, eh?

07-01-2016, 01:20 PM	#12
Steve.Ledger Veteran Member Join Date: Oct 2009 Location: Far North Qld Posts: 3,301	Originally posted by Fat Albert It bothered you that much, eh? It was certainly a factor, but not the reason - I sold every bit of Pentax gear I had to move over to MFT

07-04-2016, 04:48 PM	#13
paulpines Site Supporter Join Date: Apr 2014 Location: Toronto Posts: 64 Original Poster	Originally posted by Scorpio71GR I avoid this issue by using my K -01 is M mode. Manual mode is essentially like TAv mode on a DSLR. The K-01 has its quirks but you can work around them. I took it out for a spin on the weekend, and it does it in manual as well ---------- Post added 07-04-16 at 07:57 PM ---------- Originally posted by Steve.Ledger It's normal if you have Auto Exposure enabled. Hit the AE-L button while you walking about, that stops it. Then tap it again when ready to shoot. This however did work for me. So I may have to use this "feature"

08-15-2016, 07:31 AM	#14
PiDicus Rex Veteran Member Join Date: May 2013 Location: Melbourne, Australia Posts: 1,381	Originally posted by Steve.Ledger I sold every bit of Pentax gear I had to move over to MFT Lolz I'm filming on GH-4 this week,... using K-mount lenses,... Why not just buy a mount adapter Steve? @ Paul Pines - yup, completely normal, just one of the ways the K-01 operates to give a balanced preview image on the LCD. If you have a full manual lens on the camera, or the Iris ring turned to stop down the metering, you can press the +/- button to simulated the same action to preview the exposure. Personally, never found it annoying, but I shoot video more then stills and use K-A and K-M lenses most of the time, so I know I'm not normal, even among Pentaxians.

08-15-2016, 12:27 PM	#15
Steve.Ledger Veteran Member Join Date: Oct 2009 Location: Far North Qld Posts: 3,301	Originally posted by PiDicus Rex Lolz I'm filming on GH-4 this week,... using K-mount lenses,... Why not just buy a mount adapter Steve?. That would be rather silly of me to move to a smaller ILC camera system only to wack a huge lens with adapter onto it. I feel the Oly lenses I have now are better than the Pentax lenses I had. Especially the 45mm F1.8 prime. I think it's coated with magic.