OK, it took me a little while to figure out why I'd want to use my hands to know which lens I'd need to compose a still picture or shoot a video. Holding my arms out full length, it suddenly dawned on me – if you're shooting with prime lenses, or just want to know the optimal focal length for your shot, this technique comes in handy.
For the full article, check out DSLR Solution's post “Using Your Hands as Focal Length Calculator”.
Using your hands to visualize framing
From DSLR Solutions:
Using your arms, hands and fingers is an easy way to visualize the frame width for a specific lens making it a breeze to determine what prime lens you need for a certain shot. And once you know the frame width, approximating a 16×9 frame height, or any other frame height is a pretty easy task.
All measurements are done with your arms fully extended in front of you with hands tipped up at roughly 90 degrees. It is helpful to close one eye for determining the final frame width. Keep in mind the measurements scale according to each persons body and should be very accurate for around 95% of the population. If you fall into the 5% with short arms with long fingers or long arms with short fingers, you will need to adjust the measurements to compensate for your proportions.
The APS-C sensor size I am referring to in the table is the Canon sensor with a 1.62 multiplier, if you have a camera sensor with a different multiplier from another vendor such as Nikon or Panasonic, you will need to adjust the measurements. I have also included a table referencing “Full Frame” focal length hand measurements. Each photo can be clicked for a more detailed view of each hand position.
APS-C Crop Body Measurement Table
To read the complete article or to see the Full-frame cahrt, see DSLR Solution's post “Using Your Hands as Focal Length Calculator”
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(cover photo credit: snap from DSLR Solutions)