Focus Calibration problems/tips

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erichK Veteran Member • Posts: 5,658
Focus Calibration problems/tips

Attempting to get decent BIF photos of migration stop-over Sandhill Cranes yesterday, I noted that all my EM1 photos taken with the Sigma Bigma (FT mount 50-500mm) were slightly out of focus.

Trying to use the sprocket K Utilities lens calibration system, I find it impossible to determine accurate focus, because:

1. The camera tends to shake/vibrate too much, even mounted even on a big video tripod, as steps have to be adjusted via either the stiff, stepped rear dial or the cursor diamond up and down buttons

2.  The rear LCD and eye viewfinder both provide insufficient clean resolution and fine contrast,  even trying to use a Spyder Lenscal gadget.  (have tried with and without glasses, and asked my partner to help too., Neither of us could not reliably determine sharpest focus.

Is there any reasonably efficient way of overcoming these obstacles?

erichK
saskatoon, canada
Photography is a small voice, at best, but sometimes one photograph, or a group of them, can lure our sense of awareness.
- W. Eugene Smith, Dec 30, 1918 to Oct 15, 1978.
http://erichk.zenfolio.com/
http://www.fototime.com/inv/7F3D846BCD301F3
Photobook: http://www.blurb.ca/b/7525756-the-book-of-gina

 erichK's gear list:erichK's gear list
Olympus E-1 Olympus E-330 Olympus E-620 Olympus E-5 Olympus PEN E-PL5 +23 more
Olympus E-M1 Sigma 50-500mm F4.5-6.3 DG OS HSM
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