k-5 with k-series lens

matt_48 · 08-29-2011, 04:04 AM

Halo!
I want buy 50mm f1.2 k-series lens for my k-5 body. And my questions:
1. How the k-series lens diaphragm work in video mode?
2. Can I control the exposure by changing the aperture while shooting?
3. Is it possible to set the desired aperture before shooting?
Thanks!

GmcarsMAN · 08-29-2011, 04:21 AM

I use an M42 Helios 44M-4 on my K-r and everything works fine.

You mean only movie mode? While recording a movie you can freely turn the aperture ring and control the depth of field. And it is possible to set the desired aperture but I don't exactly know what you meant in question 3.

Adam · 08-29-2011, 09:42 AM - **1 Like**

Since the lens has an aperture ring, you can change the aperture whenever you want. In movie mode, the lens gets stopped down to whatever setting you've selected on the aperture ring.

08-29-2011, 04:04 AM	#1
matt_48 New Member Join Date: Aug 2011 Location: Kyiv Posts: 7	k-5 with k-series lens Halo! I want buy 50mm f1.2 k-series lens for my k-5 body. And my questions: 1. How the k-series lens diaphragm work in video mode? 2. Can I control the exposure by changing the aperture while shooting? 3. Is it possible to set the desired aperture before shooting? Thanks!

08-29-2011, 09:42 AM - 1 Like	#3
Adam Administrator Site Webmaster Join Date: Sep 2006 Location: Arizona Photos: Gallery \| Albums Posts: 51,595	Since the lens has an aperture ring, you can change the aperture whenever you want. In movie mode, the lens gets stopped down to whatever setting you've selected on the aperture ring. 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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08-29-2011, 04:21 AM	#2
GmcarsMAN Junior Member Join Date: Jul 2011 Posts: 30	I use an M42 Helios 44M-4 on my K-r and everything works fine. You mean only movie mode? While recording a movie you can freely turn the aperture ring and control the depth of field. And it is possible to set the desired aperture but I don't exactly know what you meant in question 3.