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01-08-2020, 12:50 AM   #61
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QuoteOriginally posted by biz-engineer Quote
Means it's not valid in 2020 because earth rotation has changed?
No, but technology can have changed...

01-08-2020, 01:08 AM   #62
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QuoteOriginally posted by photoptimist Quote
*In theory, the SR system could subtract the 15° per hour Earth rotation signal from the gyro sensor data. But in practice, that requires waiting for GPS lock before the shot and having a 3 D magnetic field meter that is calibrated for current the lens on the camera and the current location.
That's what I was going to say, based on Pentax astrotracer capability.
01-08-2020, 04:38 AM - 1 Like   #63
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I would think it would depend a bit on focal length as to how good SR could be. If you are shooting with a 15mm lens, 6.5 stops of shake reduction would take you to 5 seconds hand held. On the other hand, if you are shooting with a 400mm lens, 6.5 stops takes you to about 1/4 second. Both are beyond what most people can hand hold, but my experience says that 1/4 second exposure is more likely to be able to be compensated by shake reduction than a 5 second exposure.

Obviously this has nothing to do with the rotation of the earth. It just has to do with how shaky I am. I think Olympus' IBIS is better than Pentax's, maybe partly because of having a smaller sensor to move, but even they have some limits and if you are shooting nightscapes, you probably should plan to bring a tripod.
01-08-2020, 01:05 PM   #64
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QuoteOriginally posted by James also Quote
Damn if it is us that are turning then we are not floating through space on top of four elephants who are standing on the great Turtle A'tuin
I simply cannot think where Terry Pratchett got that idea. Everyone knows it's elephants all the way down.

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