Aperture issue with full manual lens

**aslyfox** · 12-20-2020, 08:55 AM - **1 Like**

Originally posted by Durf

.. . . (I thought I knew everything! haha)

speaking of myself only:

when asked: what do I know?

if being truthful in my response - not as much as I might claim, but more than some ( my brothers and in laws especially ) think

Durf · 12-20-2020, 09:17 AM - **1 Like**

Originally posted by aslyfox

speaking of myself only:

when asked: what do I know?

if being truthful in my response - not as much as I might claim, but more than some ( my brothers and in laws especially ) think

I've had the K1 since it was released 4 years ago or so and this morning is the first day I actually realized what the green buttons purpose is and what it could actually be used for!
Embarrassing to admit but I've never needed to use the green button until I got this SMC Pentax 135mm f/2.5 Lens a week ago!

**UncleVanya** · 12-20-2020, 01:02 PM - **1 Like**

Originally posted by Durf

I've had the K1 since it was released 4 years ago or so and this morning is the first day I actually realized what the green buttons purpose is and what it could actually be used for!
Embarrassing to admit but I've never needed to use the green button until I got this SMC Pentax 135mm f/2.5 Lens a week ago!

It actually has multiple uses.
Pentax Green Button Guide - Articles and Tips | PentaxForums.com

Not a Number · 12-20-2020, 04:23 PM - **2 Likes**

If you want see the exposure setting set the DOF preview to optical. Disable display of electronic level. Make use of aperture ring is enabled. In manual mode with your MF lens when you activate the DOF preview the aperture should stop down and the exposure value meter should show in the viewfinder. You can then zero or set over or underexposure by changing the shutter speed with the edial or with the aperture ring.

stevebrot · 12-20-2020, 06:16 PM - **1 Like**

Originally posted by Durf

I've had the K1 since it was released 4 years ago or so and this morning is the first day I actually realized what the green buttons purpose is and what it could actually be used for!
Embarrassing to admit but I've never needed to use the green button until I got this SMC Pentax 135mm f/2.5 Lens a week ago!

It is probably the most useful feature on your camera in regards to exposure and for enabling or exiting from some features. For example, auto-iso is enabled with the green button, as is metering in M mode (even with non-vintage lenses). I believe there is an article somewhere here on PF that provides a fairly complete listing. The camera manual is also a good resource on a feature by feature basis.

Steve

**DWS1** · 12-20-2020, 06:56 PM - **1 Like**

Originally posted by Durf

I've had the K1 since it was released 4 years ago or so and this morning is the first day I actually realized what the green buttons purpose is and what it could actually be used for!
Embarrassing to admit but I've never needed to use the green button until I got this SMC Pentax 135mm f/2.5 Lens a week ago!

Your not alone. I've had a K50/K70 for 5 years, and just figured out the green button last week.

**pentaxus** · 12-20-2020, 07:22 PM - **1 Like**

Once you get used to it, green button mode doesn't slow you down that much.

**mikesbike** · 12-20-2020, 08:04 PM - **1 Like**

Originally posted by Durf

Ok, when in M Mode, if I set the aperture ring to say, F8, and look down in to the lens when I snap a pic I see the blades stopping down (closing) when pressing the shutter button. I didn't know the lens/camera operated this way with manual lenses with the lever.....Obviously I have to shoot this lens in M mode!
Thanks for your help!

Yes, that is right- shoot in M mode and you can use the green button to meter and set your exposure. Once set, you can adjust both aperture setting and shutter speed to get each as you want. With this lens, you might still be able to also use the camera's AE-L feature to lock exposure, so if you use the finger or thumb dial to choose a different aperture or shutter speed, the other will follow along to preserve the exposure value. With manual lenses, the exposure system is not always perfect, but using each particular lens will teach you how far it is off at various f settings, so you'll know in advance from experience.

**UncleVanya** · 12-20-2020, 08:14 PM

Originally posted by stevebrot

It is probably the most useful feature on your camera in regards to exposure and for enabling or exiting from some features. For example, auto-iso is enabled with the green button, as is metering in M mode (even with non-vintage lenses). I believe there is an article somewhere here on PF that provides a fairly complete listing. The camera manual is also a good resource on a feature by feature basis.

Steve

Steve, look up two posts from yours...

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12-20-2020, 08:55 AM - 1 Like	#16
aslyfox Seeker of Knowledge Join Date: Aug 2016 Location: Topeka, Kansas Photos: Gallery \| Albums Posts: 24,581	Originally posted by Durf .. . . (I thought I knew everything! haha) speaking of myself only: when asked: what do I know? if being truthful in my response - not as much as I might claim, but more than some ( my brothers and in laws especially ) think

12-20-2020, 09:17 AM - 1 Like	#17
Durf Senior Member Join Date: Mar 2018 Location: North Georgia Mountains Posts: 103 Original Poster	Originally posted by aslyfox speaking of myself only: when asked: what do I know? if being truthful in my response - not as much as I might claim, but more than some ( my brothers and in laws especially ) think I've had the K1 since it was released 4 years ago or so and this morning is the first day I actually realized what the green buttons purpose is and what it could actually be used for! Embarrassing to admit but I've never needed to use the green button until I got this SMC Pentax 135mm f/2.5 Lens a week ago!

12-20-2020, 01:02 PM - 1 Like	#18
UncleVanya Loyal Site Supporter Join Date: Jul 2014 Photos: Gallery \| Albums Posts: 28,404	Originally posted by Durf I've had the K1 since it was released 4 years ago or so and this morning is the first day I actually realized what the green buttons purpose is and what it could actually be used for! Embarrassing to admit but I've never needed to use the green button until I got this SMC Pentax 135mm f/2.5 Lens a week ago! It actually has multiple uses. Pentax Green Button Guide - Articles and Tips \| PentaxForums.com

12-20-2020, 04:23 PM - 2 Likes	#19
Not a Number Moderator Join Date: Mar 2012 Location: Venice, CA Posts: 10,526	If you want see the exposure setting set the DOF preview to optical. Disable display of electronic level. Make use of aperture ring is enabled. In manual mode with your MF lens when you activate the DOF preview the aperture should stop down and the exposure value meter should show in the viewfinder. You can then zero or set over or underexposure by changing the shutter speed with the edial or with the aperture ring.

12-20-2020, 06:16 PM - 1 Like	#20
stevebrot Otis Memorial Pentaxian Join Date: Mar 2007 Location: Vancouver (USA) Photos: Gallery \| Albums Posts: 42,007	Originally posted by Durf I've had the K1 since it was released 4 years ago or so and this morning is the first day I actually realized what the green buttons purpose is and what it could actually be used for! Embarrassing to admit but I've never needed to use the green button until I got this SMC Pentax 135mm f/2.5 Lens a week ago! It is probably the most useful feature on your camera in regards to exposure and for enabling or exiting from some features. For example, auto-iso is enabled with the green button, as is metering in M mode (even with non-vintage lenses). I believe there is an article somewhere here on PF that provides a fairly complete listing. The camera manual is also a good resource on a feature by feature basis. Steve

12-20-2020, 06:56 PM - 1 Like	#21
DWS1 Site Supporter Join Date: Aug 2018 Location: Arkansas, USA Posts: 1,169	Originally posted by Durf I've had the K1 since it was released 4 years ago or so and this morning is the first day I actually realized what the green buttons purpose is and what it could actually be used for! Embarrassing to admit but I've never needed to use the green button until I got this SMC Pentax 135mm f/2.5 Lens a week ago! Your not alone. I've had a K50/K70 for 5 years, and just figured out the green button last week.

12-20-2020, 07:22 PM - 1 Like	#22
pentaxus Site Supporter Join Date: Jun 2010 Location: Central Coast, CA Posts: 1,313	Once you get used to it, green button mode doesn't slow you down that much.

12-20-2020, 08:04 PM - 1 Like	#23
mikesbike Site Supporter Join Date: Dec 2016 Location: Southeastern Michigan Posts: 4,549	Originally posted by Durf Ok, when in M Mode, if I set the aperture ring to say, F8, and look down in to the lens when I snap a pic I see the blades stopping down (closing) when pressing the shutter button. I didn't know the lens/camera operated this way with manual lenses with the lever.....Obviously I have to shoot this lens in M mode! Thanks for your help! Yes, that is right- shoot in M mode and you can use the green button to meter and set your exposure. Once set, you can adjust both aperture setting and shutter speed to get each as you want. With this lens, you might still be able to also use the camera's AE-L feature to lock exposure, so if you use the finger or thumb dial to choose a different aperture or shutter speed, the other will follow along to preserve the exposure value. With manual lenses, the exposure system is not always perfect, but using each particular lens will teach you how far it is off at various f settings, so you'll know in advance from experience.

12-20-2020, 08:14 PM	#24
UncleVanya Loyal Site Supporter Join Date: Jul 2014 Photos: Gallery \| Albums Posts: 28,404	Originally posted by stevebrot It is probably the most useful feature on your camera in regards to exposure and for enabling or exiting from some features. For example, auto-iso is enabled with the green button, as is metering in M mode (even with non-vintage lenses). I believe there is an article somewhere here on PF that provides a fairly complete listing. The camera manual is also a good resource on a feature by feature basis. Steve Steve, look up two posts from yours...