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03-27-2012, 09:16 PM - 1 Like   #16
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QuoteOriginally posted by grhazelton Quote
Kewl! A little item worth knowing. So, using a 500 mm lens on my K10d it would yield a 1 second exposure. Is this independent of film or sensor size?

Thanks!

Actually ...I've found both 500 and 600 used as the factor for full frame bodies. Given that ... if you adjust for crop sensors (x1.5) it should look something like this.

50mm lens
FF 500/50= 10 seconds max exposure or 600/60= 12 seconds max exposure

Crop 500/75= 6.7 seconds max exposure or 600/75= 8 seconds max exposure

I've always used 500 because it provided a safe exposure for sharp night skies.


Last edited by Hawki; 03-27-2012 at 09:37 PM.
03-28-2012, 04:40 AM   #17
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QuoteOriginally posted by StDevious Quote
Just wondering what equipment is needed for photographing the moon and planets. Also the prices involved in this.

https://www.pentaxforums.com/forums/pentax-slr-lens-discussion/46612-shooting-moon-13.html#post1779268


And further, just type in "astrophotography" in the search tool of the forum to see other suggestions.
03-29-2012, 02:18 AM   #18
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QuoteOriginally posted by StDevious Quote
What do you need for photographing the moon and the planets ?
A decent space ship and then you wouldn't need exotic long glass.
04-01-2012, 07:45 AM   #19
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QuoteOriginally posted by StDevious Quote
Just wondering what equipment is needed for photographing the moon and planets. Also the prices involved in this.
With the 55-300 you've got, you can get Jupiter as a largish dot and its 4 moons as small ones. If you take pictures at different times you can track how the moons move as they orbit Jupiter. Although not stunning visually, it is interesting historically as it is part of the evidence that convinced Galileo that at least some things in the solar system don't orbit the Earth.

Similarly you may be able to capture Venus showing phases. Over a period of a year or so, this provides quite strong evidence that Venus is orbiting the Sun.

Beyond that, are you aware of the Astrophotography thread here?

04-01-2012, 08:49 AM   #20
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QuoteOriginally posted by Brangdon Quote
With the 55-300 you've got, you can get Jupiter as a largish dot and its 4 moons as small ones. If you take pictures at different times you can track how the moons move as they orbit Jupiter. Although not stunning visually, it is interesting historically as it is part of the evidence that convinced Galileo that at least some things in the solar system don't orbit the Earth.

Similarly you may be able to capture Venus showing phases. Over a period of a year or so, this provides quite strong evidence that Venus is orbiting the Sun.

Beyond that, are you aware of the Astrophotography thread here?

Thanks, that's a helpful answer - it is a good starting point for choosing lens lengths.
04-11-2012, 03:07 PM - 1 Like   #21
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Good starting point for moon & sun

Here's a good starting place for choosing a lens for the moon & planets by Lunar Photography


This illustration (posted earlier in this thread) should be a good starting point for making a choice.
04-11-2012, 07:26 PM   #22
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Planetary photography is usually done with a long focal length refactor or a well corrected Schmidt Cassgrain. You will also need a goto mount or something with tracking. A lot of people have luck with the Celestron 6se and 8se as a cheap starting point.
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