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How far apart would two earth-based telescopes have to be in order for their (CCD video) images of the moon to be combinable into a stereoscopic image?
(specifically would 320km be enough?)
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Even less if you're not aiming at human viewers. 
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Yeah, give or take two inches. Good call.
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Given that the moon is 15,133,979,520 inches away there won't be much of a difference between the two images.
As that is 384,000 km, then even a separation of 300km doesn't look like it will make much difference - 3000 may be more the required distance so this moon shot is cancelled.
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Duncan Edwards Jones wrote: there won't be much of a difference between the two images.
Not my concern.
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According to this stereoscopic guide, you would need to place the cameras 12,813km apart (if I'm reading correctly).
if (Object.DividedByZero == true) { Universe.Implode(); }
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Going by the 1/30 rule - you are correct. All that is required is to have two cameras on opposite sides of the Earth. The problem is that for both cameras - the Moon will be on the horizon, which will distort the images.
Using two satellites in the same orbit but 180 degrees apart would solve the horizon problem.
Perhaps we can interest Elon Musk in the project? 
If you have an important point to make, don't try to be subtle or clever. Use a pile driver. Hit the point once. Then come back and hit it again. Then hit it a third time - a tremendous whack.
--Winston Churchill
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Foothill wrote: if I'm reading correctly
You're not! The 1/30 rule gives you the distance of the nearest object that you can successfully photograph stereoscopically given the separation of the cameras. It's not intended to work in reverse to calculate the separation of the cameras given the distance of the object you're photographing. And really it should only take a second's thought to realise why that is, namely that the whole point of stereoscopic photography is to provide the appropriate depth to objects at a variety of distances. If the separation of the cameras had to be proportionate to the distance to the object you would have to capture multiple images with the cameras at different separations!
I am not a number. I am a ... no, wait!
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moved to soapbox
=========================================================
I'm an optoholic - my glass is always half full of vodka.
=========================================================
modified 2-Feb-16 10:36am.
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Soapbox! Soapbox! 
How do we preserve the wisdom men will need,
when their violent passions are spent?
- The Lost Horizon
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Just found this gem in a question about a Socket Exeption:
private void button1_Click(object sender, EventArgs e)
{
if (serverStarted)
{
updateUI("server is already started silly sausage");
return;
}
if (radioButton1.Checked)
{
startScan();
}
else
{
connectAsServer();
}
}
If it's not broken, fix it until it is
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I'm very serious about my sausages!
=========================================================
I'm an optoholic - my glass is always half full of vodka.
=========================================================
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I think it shows poor form to bring the QA into the Lounge, for any reason, really. 
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The clue was:
Queue to the left, but pee to the right! (8)
And the answer: KEYBOARD
Guess that means I'm up again tomorrow...
Bad command or file name. Bad, bad command! Sit! Stay! Staaaay...
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What a quipster!
Life is too shor
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QWERT(Z/Y) my friend
Rules for the FOSW ![ ^]
if(this.signature != "")
{
MessageBox.Show("This is my signature: " + Environment.NewLine + signature);
}
else
{
MessageBox.Show("404-Signature not found");
}
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And AZERTYUIOP in France as well.
But most keyboards are QWERTY - it's the most popular in the world despite there being "better" alternatives such as Dvorak.
And I liked it! 
Bad command or file name. Bad, bad command! Sit! Stay! Staaaay...
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OriginalGriff wrote: And AZERTYUIOP in France as well.
I guess we better delete that of our minds
Sure most are QWERTY, most ppl use en Keyboard, but Dvorak, have to give it a try.
Rules for the FOSW ![ ^]
if(this.signature != "")
{
MessageBox.Show("This is my signature: " + Environment.NewLine + signature);
}
else
{
MessageBox.Show("404-Signature not found");
}
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Trouble is I've got 30 years plus of reflexes invested in QWERTY - so retraining is a PITA. I tried it once, and decided it was probably better - but it would take me a year or so to get as quick as I am on QWERTY (let alone faster) so it wasn't worth the effort.
And then there's the fun of being used to Dvorak and picking up your tablet, phone, or a colleagues PC which is QWERTY again...
Bad command or file name. Bad, bad command! Sit! Stay! Staaaay...
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Oh yeah i see
Sure it would be fun letting them work on your pc then ! Just turn it around next time.
I mean switching between QWERTZ and QWERTY ain't that hard but i sometimes miss stuff on the EN Keyboard. And yeah being super fast and then switching to something else would also put me into coding troubles 8)
Rules for the FOSW ![ ^]
if(this.signature != "")
{
MessageBox.Show("This is my signature: " + Environment.NewLine + signature);
}
else
{
MessageBox.Show("404-Signature not found");
}
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That's the reason I learnt to play guitar right handed ( I'm left handed ) my teacher said wherever you go and there's a guitar available you can bet on it being a right handed one and it's so difficult when you first learn an instrument - playing it with the wrong hand doesn't make much difference which is correct but it still felt weird.
We can’t stop here, this is bat country - Hunter S Thompson RIP
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I spent more time than I care to admit trying to get "quandary" to fit.
I got as far as :-
Qu (Queue, two the left)
and (but)
a r (the right)
y (erm.. pissy?)
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And all you had to do was look down a little!
Bad command or file name. Bad, bad command! Sit! Stay! Staaaay...
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I didn't looked at my keyboard for ages...The whereabouts of the keys is not a knowledge but a reflex...
Skipper: We'll fix it.
Alex: Fix it? How you gonna fix this?
Skipper: Grit, spit and a whole lotta duct tape.
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