What SR on a reverse mounted lens?

fb_penpho · 04-19-2015, 03:25 AM

I use an old 28mm reverse mounted lens for macro work. I use the fact that the lens is 28mm, so I set the SR to 28mm. Is this correct or is there some other factor that changes the logic? Do I stick with 28mm or set it to something else?

**seventhdr** · 04-19-2015, 03:35 AM

I'd stick with the 28mm when reversed. Remember though that if you use a tripod that SR should be turned off, so although you need to enter the focal length it will not be used .

Regards

Chris

vonBaloney · 04-19-2015, 06:30 AM

At the distances involved with a reversed lens (and for macro in general), the SR is not liable to work really anyway...I'd turn it off.

**RuiC** · 04-19-2015, 02:15 PM

Originally posted by seventhdr

I'd stick with the 28mm when reversed. Remember though that if you use a tripod that SR should be turned off, so although you need to enter the focal length it will not be used .

Regards

Chris

If SR is OFF it will not ask for focal len.

Glorfindelrb · 04-19-2015, 03:09 PM

I would enter 28 then turn SR off just for EXIF data.

04-19-2015, 03:25 AM	#1
fb_penpho Senior Member Join Date: Jul 2009 Location: London Photos: Gallery Posts: 212	What SR on a reverse mounted lens? I use an old 28mm reverse mounted lens for macro work. I use the fact that the lens is 28mm, so I set the SR to 28mm. Is this correct or is there some other factor that changes the logic? Do I stick with 28mm or set it to something else?

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04-19-2015, 03:35 AM	#2
seventhdr Site Supporter Join Date: Mar 2007 Location: Christchurch, New Zealand Photos: Gallery Posts: 1,439	I'd stick with the 28mm when reversed. Remember though that if you use a tripod that SR should be turned off, so although you need to enter the focal length it will not be used . Regards Chris

04-19-2015, 06:30 AM	#3
vonBaloney Pentaxian Join Date: Oct 2011 Location: Albuquerque, NM Posts: 6,029	At the distances involved with a reversed lens (and for macro in general), the SR is not liable to work really anyway...I'd turn it off.

04-19-2015, 02:15 PM	#4
RuiC Site Supporter Join Date: Jan 2009 Location: Lisboa - The best destination in Europe Posts: 633	Originally posted by seventhdr I'd stick with the 28mm when reversed. Remember though that if you use a tripod that SR should be turned off, so although you need to enter the focal length it will not be used . Regards Chris If SR is OFF it will not ask for focal len.

04-19-2015, 03:09 PM	#5
Glorfindelrb Veteran Member Join Date: Feb 2012 Posts: 364	I would enter 28 then turn SR off just for EXIF data.

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