Why does my k3 ask the mm on manual lenses?

**photogem** · 01-16-2023, 02:09 AM

Originally posted by AstroDave

It wants to know what focal length to use for shake reduction calculations. If you have that turned off, it's irrelevant.

Good to know, I never knew it was (just) about calculating SR!
One never stops learning!

pentasonic49 · 01-23-2023, 11:35 AM

Try that with a manual zoom, you have to have a guess at what focal lenght to put in, I would go for the longest.

35mmfilmfan · 01-23-2023, 12:08 PM

When I use my Adaptall II zoom lenses on my K3, I use the mid point - i.e. for the 70 - 210, I choose 140 (210 + 70 = 280, divide by 2 = 140). Maybe not mathematically accurate, but seems to work for me.

pschlute · 01-23-2023, 01:43 PM - **1 Like**

Originally posted by pentasonic49

Try that with a manual zoom, you have to have a guess at what focal lenght to put in, I would go for the longest.

That may be the worst option.

Pictures taken using the mid or lower FL range will be over-compensated by the SR mechanism if you enter a longer FL setting in the SR menu.. Best advice is to use either the actual FL, or failing that, the lowest FL or the mid range with a bias toward the lower.

Registering a lower FL than the one in use may lead to a less than ideal SR response, but it wont induce shake. Registering a longer FL can do just that

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01-16-2023, 02:09 AM	#16
photogem Site Supporter Join Date: Apr 2015 Posts: 2,960	Originally posted by AstroDave It wants to know what focal length to use for shake reduction calculations. If you have that turned off, it's irrelevant. Good to know, I never knew it was (just) about calculating SR! One never stops learning!

01-23-2023, 11:35 AM	#17
pentasonic49 Veteran Member Join Date: Oct 2012 Location: weston-super-mare Posts: 390	Try that with a manual zoom, you have to have a guess at what focal lenght to put in, I would go for the longest.

01-23-2023, 12:08 PM	#18
35mmfilmfan Pentaxian Join Date: Oct 2016 Location: Norfolk, UK Posts: 3,292	When I use my Adaptall II zoom lenses on my K3, I use the mid point - i.e. for the 70 - 210, I choose 140 (210 + 70 = 280, divide by 2 = 140). Maybe not mathematically accurate, but seems to work for me.

01-23-2023, 01:43 PM - 1 Like	#19
pschlute Moderator Loyal Site Supporter Join Date: Mar 2007 Location: Surrey, UK Photos: Gallery Posts: 6,522	Originally posted by pentasonic49 Try that with a manual zoom, you have to have a guess at what focal lenght to put in, I would go for the longest. That may be the worst option. Pictures taken using the mid or lower FL range will be over-compensated by the SR mechanism if you enter a longer FL setting in the SR menu.. Best advice is to use either the actual FL, or failing that, the lowest FL or the mid range with a bias toward the lower. Registering a lower FL than the one in use may lead to a less than ideal SR response, but it wont induce shake. Registering a longer FL can do just that

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