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Old 10-09-2009, 07:29 AM
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Ok, here's a test anyone can try:

In a dark space,(Room, or outdoor at night) fix a torch(flashlight) to a tripod or other stand,so that the torch is pointing toward you from 20 feet away.Switch torch on...

Using hand-held camera, with any lens
Focus on torch,go through shutter speeds from 1/30sec to 1/2000 sec

Check results on imaging program at 100%(actual pixels), to see which speed captured the sharpest circle of light from the torch. Then do this with every lens you have.

This will give you your personal fastest minimum shutter speed,that captures maximum sharpness, with each lens.

Regards, Ken
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  #22 (permalink)  
Old 10-09-2009, 10:32 PM
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Quote:
Originally Posted by kencaleno View Post
Ok, here's a test anyone can try:

In a dark space,(Room, or outdoor at night) fix a torch(flashlight) to a tripod or other stand,so that the torch is pointing toward you from 20 feet away.Switch torch on...

Using hand-held camera, with any lens
Focus on torch,go through shutter speeds from 1/30sec to 1/2000 sec

Check results on imaging program at 100%(actual pixels), to see which speed captured the sharpest circle of light from the torch. Then do this with every lens you have.

This will give you your personal fastest minimum shutter speed,that captures maximum sharpness, with each lens.

Regards, Ken
Youve mentionned this test before and its been shot down before. NEXT!
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  #23 (permalink)  
Old 10-10-2009, 02:13 AM
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Originally Posted by OsmosisStudios View Post
Youve mentionned this test before and its been shot down before. NEXT!
And because it works!, and no-one wants to be proved wrong, that's why-they are happy with their limited knowledge, and wouldn't try this experiment because the results would differ from what they want to believe. Have you tried the experiment?-of course not-you might learn something-It's not my idea, it's just an experiment I learned from my photography professor emeritus at university-but what would he know? As much as you? It is just impossible to teach people who know it all-The responsibilty must be painful- I would rather be as I am and still keep learning.Ken

Last edited by kencaleno; 10-10-2009 at 06:09 AM.
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Old 10-10-2009, 08:28 AM
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I think this is more about acceptable sharpness than required shutter speed, for smaller prints the 1/focal length usualy gets you close tot he shutter speed you can hold and gives good results at low to medium format printing. Maybe at higher format printing the images would need to be rock steady sharp and then alternative shutter speed rules should be used.... but it isnt really a constant rule as people vary so much to what they can hand hold... and anyway mr tripod would like a word with you hehehe

It would be interesting to jot down your focal length rule though ken for the times I cant get a sharp pic with my normal 1/f procedure.
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