Pentax SMC 500mm F4.5 on a K1

Andykins67 · 03-20-2019, 05:04 PM

Can anyone offer advice how to set a K1 to accept an SMC 500mm F4.5. I've played with the settings and still get a flashing F in the display!

Adam · 03-20-2019, 05:13 PM

Originally posted by Andykins67

Can anyone offer advice how to set a K1 to accept an SMC 500mm F4.5. I've played with the settings and still get a flashing F in the display!

You will always see the F-- display, so that's normal. Here are the full instructions for the settings and metering procedure:

How to use/meter Manual & M42 Lenses on all Pentax DSLRs (K-1, K-3, K-5, K-30, etc) - PentaxForums.com

TLDR: allow use of the aperture ring via a custom function, put the camera in M mode mode, and press the green button before taking each photo.

pschlute · 03-20-2019, 05:17 PM

Originally posted by Andykins67

Can anyone offer advice how to set a K1 to accept an SMC 500mm F4.5. I've played with the settings and still get a flashing F in the display!

Custom menu 4: menu item 26: Allow aperture ring...set to allow

The camera will not recognise the aperture but you will be able to use stop-down metering with the green button in Manual exposure mode, or Av mode at f4.5 only.

Andykins67 · 03-20-2019, 05:34 PM

Originally posted by pschlute

Custom menu 4: menu item 26: Allow aperture ring...set to allow

The camera will not recognise the aperture but you will be able to use stop-down metering with the green button in Manual exposure mode, or Av mode at f4.5 only.

Thank you.

jcdoss · 03-20-2019, 10:09 PM

It's also possible to use Av or TAv with this lens since there's no aperture lever. It's just a bit more convenient than the green button and should yield the same result ( in Av mode, anyway).

03-20-2019, 05:04 PM	#1
Andykins67 Junior Member Join Date: Apr 2016 Photos: Gallery Posts: 44	Pentax SMC 500mm F4.5 on a K1 Can anyone offer advice how to set a K1 to accept an SMC 500mm F4.5. I've played with the settings and still get a flashing F in the display!

03-20-2019, 05:13 PM	#2
Adam Administrator Site Webmaster Join Date: Sep 2006 Location: Arizona Photos: Gallery \| Albums Posts: 51,594	Originally posted by Andykins67 Can anyone offer advice how to set a K1 to accept an SMC 500mm F4.5. I've played with the settings and still get a flashing F in the display! You will always see the F-- display, so that's normal. Here are the full instructions for the settings and metering procedure: How to use/meter Manual & M42 Lenses on all Pentax DSLRs (K-1, K-3, K-5, K-30, etc) - PentaxForums.com TLDR: allow use of the aperture ring via a custom function, put the camera in M mode mode, and press the green button before taking each photo. 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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03-20-2019, 05:17 PM	#3
pschlute Moderator Loyal Site Supporter Join Date: Mar 2007 Location: Surrey, UK Photos: Gallery Posts: 8,198	Originally posted by Andykins67 Can anyone offer advice how to set a K1 to accept an SMC 500mm F4.5. I've played with the settings and still get a flashing F in the display! Custom menu 4: menu item 26: Allow aperture ring...set to allow The camera will not recognise the aperture but you will be able to use stop-down metering with the green button in Manual exposure mode, or Av mode at f4.5 only.

03-20-2019, 05:34 PM	#4
Andykins67 Junior Member Join Date: Apr 2016 Photos: Gallery Posts: 44 Original Poster	Originally posted by pschlute Custom menu 4: menu item 26: Allow aperture ring...set to allow The camera will not recognise the aperture but you will be able to use stop-down metering with the green button in Manual exposure mode, or Av mode at f4.5 only. Thank you.

03-20-2019, 10:09 PM	#5
jcdoss Pentaxian Join Date: Nov 2012 Location: Ingelheim am Rhein, Germany Photos: Gallery \| Albums Posts: 6,768	It's also possible to use Av or TAv with this lens since there's no aperture lever. It's just a bit more convenient than the green button and should yield the same result ( in Av mode, anyway).