A friend from another list posted these - I know 80mm is not "long"
yet it seems to work alright
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http://gallery.leica-users.org/v/barbour/paw2013/ball.jpg.html
http://gallery.leica-users.org/v/barbour/paw2013/winter_001.jpg.html
Leica R 80mm 1.4 at 1.4 on Sony A7r in RAW w focus peaking (red)
easy manual focus
many thanks,
Steve
********************************
Amities
Philippe
Le 21 déc. 13 à 01:01, usher99@xxxxxxx a écrit :
> http://diglloyd.com/blog/index-60.html#20131215_3-SonyA7R-shutter-vibration-180mm-vertical
>
>
> Portrait orientation seems worse due to shutter shock even using
> adapter with tripod foot. Reports that good L bracket for native
> lenses sans foot and bean bag mitigate this effect. More of an issue
> with some long lenses especially if resonant just right (wrong). Some
> effect according to digiloyd even with the new FE 55 Sonar:
>
> "Taking the landscape orientation 180mm focal length results
> showing a
> ~1 pixel blur (e.g., camera displacement by about 5 microns), we can
> deduce a 55/180 fractional blur = 1/3 pixel, an idea based on some
> angular rotation causes by the shutter shock which of course would
> affect a long lens more in pixel terms. About 1/3 pixel looks to be
> about what I’m seeing with the 55/1.8 on the A7R at the problem
> speeds.
> It’s like a very strong anti-aliasing filter on the Red Barn scene. "
>
> As A7R has open api, Sony or others should be able to give firmware
> (or app) anti-shock option I would think similiar to Oly. Perhaps A7
> is a better option with EFC for OMZ lenses????
>
> Mike
>
>
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