Pentax K-7 and Rokinon 16mm manual

NotMyFatDog · 12-01-2019, 01:44 AM

I have looked through my User's Manual, and couldn't find anything on this.

Does anyone know why my K-7 does not recognize the correct focal length on my 16mm f2.0 prime? The closest the K-7 assesses is 15mm, which I am fine with, but I am wondering if it affects my pictures significantly?

And, can this be resolved?

Thank you!

Adam · 12-01-2019, 01:59 AM

Originally posted by NotMyFatDog

I have looked through my User's Manual, and couldn't find anything on this.

Does anyone know why my K-7 does not recognize the correct focal length on my 16mm f2.0 prime? The closest the K-7 assesses is 15mm, which I am fine with, but I am wondering if it affects my pictures significantly?

And, can this be resolved?

Thank you!

No, it will not affect the image quality. Selecting 15mm should be fine.

Manual focus lenses do not transmit focal length information, hence you need to set it yourself via the menu.

NotMyFatDog · 12-01-2019, 02:02 AM

Thank you Adam. While I was hoping there might be a hidden menu to manually input a different number than the provided selection list, I will continue to select 15mm.

Bertrand3000 · 12-01-2019, 02:15 AM

The camera is asking for the focal length in order to make Shake Reduction the most effective. If the exact focal length is not offered, choosing the closest is, obviously, perfectly fine.

**gump** · 12-01-2019, 04:25 AM

I have been using the Rok 16 with my K-70 for about a year and everything is fine.

12-01-2019, 01:44 AM	#1
NotMyFatDog Senior Member Join Date: Nov 2019 Location: Beautiful British Columbia, Canada Photos: Albums Posts: 143	Pentax K-7 and Rokinon 16mm manual I have looked through my User's Manual, and couldn't find anything on this. Does anyone know why my K-7 does not recognize the correct focal length on my 16mm f2.0 prime? The closest the K-7 assesses is 15mm, which I am fine with, but I am wondering if it affects my pictures significantly? And, can this be resolved? Thank you!

12-01-2019, 01:59 AM	#2
Adam Administrator Site Webmaster Join Date: Sep 2006 Location: Arizona Photos: Gallery \| Albums Posts: 51,594	Originally posted by NotMyFatDog I have looked through my User's Manual, and couldn't find anything on this. Does anyone know why my K-7 does not recognize the correct focal length on my 16mm f2.0 prime? The closest the K-7 assesses is 15mm, which I am fine with, but I am wondering if it affects my pictures significantly? And, can this be resolved? Thank you! No, it will not affect the image quality. Selecting 15mm should be fine. Manual focus lenses do not transmit focal length information, hence you need to set it yourself via the menu. 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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12-01-2019, 02:02 AM	#3
NotMyFatDog Senior Member Join Date: Nov 2019 Location: Beautiful British Columbia, Canada Photos: Albums Posts: 143 Original Poster	Thank you Adam. While I was hoping there might be a hidden menu to manually input a different number than the provided selection list, I will continue to select 15mm.

12-01-2019, 02:15 AM	#4
Bertrand3000 Veteran Member Join Date: Feb 2019 Posts: 2,009	The camera is asking for the focal length in order to make Shake Reduction the most effective. If the exact focal length is not offered, choosing the closest is, obviously, perfectly fine.

12-01-2019, 04:25 AM	#5
gump Site Supporter Join Date: Apr 2018 Location: Canton, Ohio Posts: 1,016	I have been using the Rok 16 with my K-70 for about a year and everything is fine.

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