To infinity and beyond
Jul 7, 2012 14:21:09 #
mpep05 wrote:
This could also be an issue of the image being overexposed rather than out of focus... :idea:
What were your exposure settings? Often when matrix metering a small very bright area on a dark background, the camera tries to correctly expose for the entire image, and overexposes the bright area as a result.
What were your exposure settings? Often when matrix metering a small very bright area on a dark background, the camera tries to correctly expose for the entire image, and overexposes the bright area as a result.
Nope. Not an overexposure. I kept trying different exposures until I could see the darker shadows of the moon on the camera display. Never once did I move the focus ring off infinity. I could not tell the moon was out of focus until I viewed the pictures on my computer.
Jul 7, 2012 14:37:39 #
j4door wrote:
A couple nights ago I was taking pictures of the moon using a tripod and self timer. I set the manual focus on infinity. In all my photos the moon was out of focus. I haven't had a chance to investigate as it's been cloudy each night since. I suspect I went "beyond infinity". Is this possible. I shoot with a D80.
Next time you try that, bring a few of your cousins - you know, those guys in our avatar. They should be able to figure it out.
Jul 7, 2012 17:49:31 #
j4door wrote:
A couple nights ago I was taking pictures of the moon using a tripod and self timer. I set the manual focus on infinity. In all my photos the moon was out of focus. I haven't had a chance to investigate as it's been cloudy each night since. I suspect I went "beyond infinity". Is this possible. I shoot with a D80.
Most optical devices go beyond infinity as related to the mechanical adjusting mechanism (lens element spacing and movement) to allow for manufacturing tolerances, environment and use (wear) factors. Look at the moon with your binoculars. You should be able to see the effect as you adjust toward infinity for focus. If you keep going in that direction until you hit the stop, it probably will defocus slightly as the spacing of the lenses goes beyond infinity! Its a mechanical/lens convergence thing!
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Jul 7, 2012 21:34:21 #
Jul 7, 2012 23:09:02 #
Jul 8, 2012 01:00:29 #
Hey, guys: When you focus on the moon it is NOT at infinity, but only out there about 230,000 miles. Objects farther than that are available if you want to look for them, so the manufacturer is only letting you the option of focusing on the farther objects if you need to!!! They are smarter than we are giving them credit for (which). (Ha, Ha)
Jul 8, 2012 02:33:30 #
RTR wrote:
Try this:Thanks MT. Good design on those lenses :). I just wish my lenses had the old style markings that showed me my DOF then I could focus myself :(
http://www.dofmaster.com/dofjs.html
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Jul 12, 2012 22:58:06 #
oldtool2 wrote:
Me too! Did you know parallel lines meet and cross at infinity? My math teacher taught me that years ago. We spent a semester arguing about that. He finally showed me a Russian math book that was use at the time to teach that theory.
Jim D
fthomas wrote:
Theoretically there is nothing "Beyond Infinity". Of course I also believe the earth is flat. (Sorry, just couldn't resist!)
Me too! Did you know parallel lines meet and cross at infinity? My math teacher taught me that years ago. We spent a semester arguing about that. He finally showed me a Russian math book that was use at the time to teach that theory.
Jim D
Ok, Jim, you opened this door. Please explain to us just what you mean, and the theory behind this.
Ken
Jul 12, 2012 23:55:58 #
K2KImages wrote:
quote=oldtool2 quote=fthomas Theoretically there... (show quote)
That's like saying you can think of a straight line as a circle of infinite radius...
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