jared_kipe said:
What?
Of course it changes the aperture. Is that not perfectly obvious?
The moon might as well be lit by a candle, what does the light source have to do with anything? It is also obvious to say he should need a relatively fast shutter speed - because the moon is moving. I already said that.
But what you're saying is what we call a logical falacy. Lets say I want to shoot a building under daylight. If the building isn't moving it doesn't matter what shutter speed I use. So just because its lit by the sun doesn't mean you need to use ... daylight exposure speeds?? It should occours to you that that statement is rediculous.
No, it is not perfectly obvious to a novis. They think that since they are using an F8 lens that is what they will get. Add the X-converter to the equation and it changes. If they are doing manual calcualtions of the exposure, that has to be factored in. By bracketing the exposure several stops above and below the normal "Day Light" exposure will give decent results.
Logical Falacy? No, I've photograhed the moon many times using this "RULE OF THUMB". Including several hours on my back on the cold ground one November photographing an eclips from begining to end.
f16 at 1/60th of a second with ISO 100...try it and see.
From New York Institute of Photography:
http://www.nyip.com/tips/current/eclipse1104.php
Exposure
Since the moon is a sunlit object, the "sunny 16" rule applies. (This is an easy-to-remember trick for photographing any sunlit subject that photographers relied upon prior to the days of autoexposure.) Simply put, the correct exposure for an object lit by bright sun can be a shutter speed of 1/the ISO of the film you're using, with an aperture of ƒ/16. For example, if you're using an ISO 400 speed film, a good starting point for a correct exposure of the moon would be ƒ/16 at 1/400. Since most cameras don't have a shutter speed setting of 1/400, we would suggest bracketing the exposure and making one at 1/250 at ƒ/16, and one at 1/500 at ƒ/16.
Don't trust me, check out:
http://home.hiwaay.net/~krcool/Astro/moon/howtophoto/