just how good is the K7 shake reduction?

Lowell Goudge · 08-17-2009, 08:21 AM

the attached image is shot with an SMC 300mmF4 plus 1.7x AF TC (510mm focal length total). Considering the crop factor, this would equate to a 750mm lens on a film body, implying a hand hold shutter speed of 1/750

Can anyone else do better, this was shot at 1/40 a full 4 stops below the rule of thumb.

*ivoire* · 08-17-2009, 08:57 AM

I saw this after drinking 2 cups of coffee and had to accept the challenge. Put the promaster 1.7xtc on the f*300mm and onto the K7. It had just stopped raining and the birds began to show up. handheld, f4.5, 1/15, iso100, 300mm, approx 20ft away. i can't say i did better, but the sr on the k7 is "very good". last image is with a bit of PP

Class A · 08-17-2009, 06:09 PM

Originally Posted by Lowell Goudge

Can anyone else do better, this was shot at 1/40 a full 4 stops below the rule of thumb.

We see through your promotional verbiage. You are just very good at hand-holding.

Seriously, very impressive image, unbelievable for the focal length / shutter speed combination.

CWyatt · 08-17-2009, 06:29 PM

ivoire, 1/15 might have been pushing it - I think there's quite a bit of shake visible in the your shot.

EDIT - or the combination of lens and teleconverter has produced softness.

*ivoire* · 08-17-2009, 06:38 PM

Originally Posted by CWyatt

ivoire, 1/15 might have been pushing it - I think there's quite a bit of shake visible in the your shot.

EDIT - or the combination of lens and teleconverter has produced softness.

yep, my hands shake quite a bit normally and afte coffee even worse... plus the added softness of the tc doesn't help. but that was the idea behind the combination for illustrating shake reduction. I bought into pentax because of the SR as 'familial tremors/epilepsy' runs in the family lineage