Manual lens on K1

**barondla** · 08-22-2019, 10:38 PM

Originally posted by GUB

You misunderstand - Many of us have several say 50mm lenses of different make/model. My A 50 1.4 could be 50.1, My M50 1.17 could be 50.2 etc.

I use this method, with the Q to id adapted lenses. Very handy.
The K-1 needs at least all whole numbers.
Thanks,
barondla

**Apet-Sure** · 08-23-2019, 07:40 AM

Originally posted by GUB

My A 50 1.4 could be 50.1, My M50 1.17 could be 50.2 etc.

Yes, I understand, and addressed this point. I think the bigger issue is, could a difference of 0.1mm really make any practical difference to the SR system? We're talking about a difference of about 4 thousandths of an inch. If you have a lens with an oddball focal length, you pick a number from the list in the camera that is the closest to what you have anyway (I chose 50mm for my 55mm lens). The SR system is great, but I'd be surprised if it could resolve 0.1mm in any meaningful way that a photographer would notice in an image.

pschlute · 08-23-2019, 11:34 AM - **1 Like**

Originally posted by Apet-Sure

Yes, I understand, and addressed this point. I think the bigger issue is, could a difference of 0.1mm really make any practical difference to the SR system?

His point was that by having a very fine adjustment parameter of the SR menu he would be able to identify his lenses after the photoshoot better. "ie My A 50 1.4 could be 50.1, My M50 1.17 could be 50.2 etc."....it would be in the exif

Nothing at all to do with the accuracy of the SR mechanism which could not care less if the FL was set at 45 or 55mm

**Apet-Sure** · 08-23-2019, 11:47 AM

Oh, right, hadn't thought of using it as a lens ID. Neat idea.

**Botanizer** · 10-14-2020, 04:37 AM

ASTROTRACER PROBLEM

The focal length setting appears to affect the astrotracer function too. I have a 952mm telescope and the closest focal length option is 1000mm. It does not track well. Each star is a closely spaced line of dots. It does OK with my Pentax 300mm f/4 and my old manual focus Sigma 500mm f/4.5. I guess that is because those focal length options are available, the 300mm is automatically selected.

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08-22-2019, 10:38 PM	#16
barondla Site Supporter Join Date: Sep 2006 Location: midwest, United States Photos: Gallery \| Albums Posts: 5,714	Originally posted by GUB You misunderstand - Many of us have several say 50mm lenses of different make/model. My A 50 1.4 could be 50.1, My M50 1.17 could be 50.2 etc. I use this method, with the Q to id adapted lenses. Very handy. The K-1 needs at least all whole numbers. Thanks, barondla

08-23-2019, 07:40 AM	#17
Apet-Sure Site Supporter Join Date: Dec 2015 Location: Goldsboro North Carolina Photos: Gallery \| Albums Posts: 2,861	Originally posted by GUB My A 50 1.4 could be 50.1, My M50 1.17 could be 50.2 etc. Yes, I understand, and addressed this point. I think the bigger issue is, could a difference of 0.1mm really make any practical difference to the SR system? We're talking about a difference of about 4 thousandths of an inch. If you have a lens with an oddball focal length, you pick a number from the list in the camera that is the closest to what you have anyway (I chose 50mm for my 55mm lens). The SR system is great, but I'd be surprised if it could resolve 0.1mm in any meaningful way that a photographer would notice in an image.

08-23-2019, 11:34 AM - 1 Like	#18
pschlute Moderator Loyal Site Supporter Join Date: Mar 2007 Location: Surrey, UK Photos: Gallery Posts: 8,198	Originally posted by Apet-Sure Yes, I understand, and addressed this point. I think the bigger issue is, could a difference of 0.1mm really make any practical difference to the SR system? His point was that by having a very fine adjustment parameter of the SR menu he would be able to identify his lenses after the photoshoot better. "ie My A 50 1.4 could be 50.1, My M50 1.17 could be 50.2 etc."....it would be in the exif Nothing at all to do with the accuracy of the SR mechanism which could not care less if the FL was set at 45 or 55mm

08-23-2019, 11:47 AM	#19
Apet-Sure Site Supporter Join Date: Dec 2015 Location: Goldsboro North Carolina Photos: Gallery \| Albums Posts: 2,861	Oh, right, hadn't thought of using it as a lens ID. Neat idea.

10-14-2020, 04:37 AM	#20
Botanizer Site Supporter Join Date: Dec 2017 Posts: 286	ASTROTRACER PROBLEM The focal length setting appears to affect the astrotracer function too. I have a 952mm telescope and the closest focal length option is 1000mm. It does not track well. Each star is a closely spaced line of dots. It does OK with my Pentax 300mm f/4 and my old manual focus Sigma 500mm f/4.5. I guess that is because those focal length options are available, the 300mm is automatically selected.