F-- when setting aperture on the lens

aembleton · 03-14-2017, 04:05 PM

I have just purchased a Samyang F1.4/35mm lens. If I put the lens aperture into `A` mode then I can control it from the K1 and it all works well.

If I then change the aperture on the lens, I get an `F--` message and I can't take any photos.

I can understand that the camera body doesn't know what the aperture has been set to, but is there anyway that I can override this so that I can take photos aperture. I mean, it doesn't need to know the aperture does it?

pathdoc · 03-14-2017, 04:11 PM - **1 Like**

All your questions will be answered here.

mikeSF · 03-14-2017, 04:14 PM

beat me to it!

cpobuttons · 03-14-2017, 04:16 PM

dont have a K-1 but in your menu settings find the setting for allow aperture...enable it and your good to go...

Adam · 03-14-2017, 04:23 PM - **1 Like**

Originally posted by aembleton

I have just purchased a Samyang F1.4/35mm lens. If I put the lens aperture into `A` mode then I can control it from the K1 and it all works well.

If I then change the aperture on the lens, I get an `F--` message and I can't take any photos.

I can understand that the camera body doesn't know what the aperture has been set to, but is there anyway that I can override this so that I can take photos aperture. I mean, it doesn't need to know the aperture does it?

TD;LR

Set the aperture ring back to A
Put the camera in Av mode
Turn the rear e-dial to change the aperture

There really is no point in using the aperture ring, as stop-down metering can be less accurate than when the camera knows the aperture.

You can also change the aperture on the fly while in P mode- just turn the rear e-dial and you will override the camera's aperture choice.

aembleton · 03-14-2017, 05:02 PM

Thanks everyone, that worked great.

@Adam, you're right, there is no real point in it and it's easier to use the e-dial because I can then see the set aperture in the viewfinder. It was more, just out of interest.

**UncleVanya** · 03-14-2017, 06:20 PM

TL; DR I get, what is TD; LR?

**W.j.christy** · 03-15-2017, 06:18 AM - **1 Like**

Originally posted by UncleVanya

TL; DR I get, what is TD; LR?

too daunting, lazy reader?

**UncleVanya** · 03-15-2017, 06:49 AM

Originally posted by W.j.christy

too daunting, lazy reader?

Lol. Good one!

03-14-2017, 04:05 PM	#1
aembleton New Member Join Date: Jan 2017 Location: Manchester, UK Posts: 6	F-- when setting aperture on the lens I have just purchased a Samyang F1.4/35mm lens. If I put the lens aperture into `A` mode then I can control it from the K1 and it all works well. If I then change the aperture on the lens, I get an `F--` message and I can't take any photos. I can understand that the camera body doesn't know what the aperture has been set to, but is there anyway that I can override this so that I can take photos aperture. I mean, it doesn't need to know the aperture does it?

03-14-2017, 04:23 PM - 1 Like	#5
Adam Administrator Site Webmaster Join Date: Sep 2006 Location: Arizona Photos: Gallery \| Albums Posts: 51,595	Originally posted by aembleton I have just purchased a Samyang F1.4/35mm lens. If I put the lens aperture into `A` mode then I can control it from the K1 and it all works well. If I then change the aperture on the lens, I get an `F--` message and I can't take any photos. I can understand that the camera body doesn't know what the aperture has been set to, but is there anyway that I can override this so that I can take photos aperture. I mean, it doesn't need to know the aperture does it? TD;LR Set the aperture ring back to A Put the camera in Av mode Turn the rear e-dial to change the aperture There really is no point in using the aperture ring, as stop-down metering can be less accurate than when the camera knows the aperture. You can also change the aperture on the fly while in P mode- just turn the rear e-dial and you will override the camera's aperture choice. 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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03-14-2017, 04:11 PM - 1 Like	#2
pathdoc Pentaxian Join Date: Mar 2015 Photos: Gallery \| Albums Posts: 6,381	All your questions will be answered here.

03-14-2017, 04:14 PM	#3
mikeSF Pentaxian Join Date: Jan 2009 Location: East Bay Area, CA Photos: Gallery Posts: 6,620	beat me to it!

03-14-2017, 04:16 PM	#4
cpobuttons Senior Member Join Date: Feb 2013 Location: Norwich, Ct Posts: 139	dont have a K-1 but in your menu settings find the setting for allow aperture...enable it and your good to go...

03-14-2017, 05:02 PM	#6
aembleton New Member Join Date: Jan 2017 Location: Manchester, UK Posts: 6 Original Poster	Thanks everyone, that worked great. @Adam, you're right, there is no real point in it and it's easier to use the e-dial because I can then see the set aperture in the viewfinder. It was more, just out of interest.

03-14-2017, 06:20 PM	#7
UncleVanya Loyal Site Supporter Join Date: Jul 2014 Photos: Gallery \| Albums Posts: 28,404	TL; DR I get, what is TD; LR?

03-15-2017, 06:18 AM - 1 Like	#8
W.j.christy Site Supporter Join Date: Oct 2015 Location: Texas Photos: Albums Posts: 558	Originally posted by UncleVanya TL; DR I get, what is TD; LR? too daunting, lazy reader?

03-15-2017, 06:49 AM	#9
UncleVanya Loyal Site Supporter Join Date: Jul 2014 Photos: Gallery \| Albums Posts: 28,404	Originally posted by W.j.christy too daunting, lazy reader? Lol. Good one!