Eclipse of moon on Oct. 27

"Prometheus" wrote in message
...
In article , C J Donoghue
writes
Alan Browne wrote:

William Graham wrote:

Unless you've got a flash with a guide number of 250 thousand
miles........

That would require an f/1 lens for ISO 100. If the lens is f/4 then a
GN of
1,000,000 miles would be required...

Uhh, why flash the moon to capture an eclipse?

Well, it's just fill flash........

In article , Colin D
writes


Dang it all! the best idea is to just let the earth get out of the
way, and then
the sun will light the eclipse!

How many Saturn V lunch rockets would it take to move the Earth out of
he way?

--
Ian G8ILZ

In article , Colin D
writes


Dang it all! the best idea is to just let the earth get out of the
way, and then
the sun will light the eclipse!

How many Saturn V lunch rockets would it take to move the Earth out of
he way?

--
Ian G8ILZ

In article , Colin D
writes


Dang it all! the best idea is to just let the earth get out of the
way, and then
the sun will light the eclipse!

How many Saturn V lunch rockets would it take to move the Earth out of
he way?

--
Ian G8ILZ

In article , Colin D
writes


Dang it all! the best idea is to just let the earth get out of the
way, and then
the sun will light the eclipse!

How many Saturn V lunch rockets would it take to move the Earth out of
he way?

--
Ian G8ILZ

Prometheus wrote:

In article , Colin D
writes


Dang it all! the best idea is to just let the earth get out of the
way, and then
the sun will light the eclipse!

How many Saturn V lunch rockets would it take to move the Earth out of
he way?

--
Ian G8ILZ

Well, either the moon or the earth will get out of the way if you wait an
hour or so. Actually, I wouldn't mind a Saturn lunch rocket here, I'm
getting hungry ...

Colin ZL2BAF

Prometheus wrote:

In article , Colin D
writes


Dang it all! the best idea is to just let the earth get out of the
way, and then
the sun will light the eclipse!

How many Saturn V lunch rockets would it take to move the Earth out of
he way?

--
Ian G8ILZ

Well, either the moon or the earth will get out of the way if you wait an
hour or so. Actually, I wouldn't mind a Saturn lunch rocket here, I'm
getting hungry ...

Colin ZL2BAF

Prometheus wrote:

In article , Colin D
writes


Dang it all! the best idea is to just let the earth get out of the
way, and then
the sun will light the eclipse!

How many Saturn V lunch rockets would it take to move the Earth out of
he way?

--
Ian G8ILZ

Well, either the moon or the earth will get out of the way if you wait an
hour or so. Actually, I wouldn't mind a Saturn lunch rocket here, I'm
getting hungry ...

Colin ZL2BAF

Prometheus wrote:

In article , Colin D
writes


Dang it all! the best idea is to just let the earth get out of the
way, and then
the sun will light the eclipse!

How many Saturn V lunch rockets would it take to move the Earth out of
he way?

--
Ian G8ILZ

Well, either the moon or the earth will get out of the way if you wait an
hour or so. Actually, I wouldn't mind a Saturn lunch rocket here, I'm
getting hungry ...

Colin ZL2BAF

Prometheus wrote in message ...
In article , Paul J Gans
writes
In rec.photo.digital Prometheus wrote:
In article , Paul J Gans
writes
In rec.photo.digital Prometheus wrote:
In article , Alan Browne
writes
William Graham wrote:

Unless you've got a flash with a guide number of 250 thousand
miles........

That would require an f/1 lens for ISO 100. If the lens is f/4 then a
GN of 1,000,000 miles would be required...

Don't forget the flash would have to fire about 2.69s before the shutter
is fully open.

Isn't that delay automatic with all 1,000,000 guide number flash guns?

Only the ones where the release is on the gun and connecting to the
remote shutter release on the camera, then you have an adjustable delay
between the flash and the shutter.

Oh. Thanks. I didn't know that.

There is a special technique for Jupiter shots; you have to point the
camera to the east at Jupiter rise when you fire the flash and to the
west about eight hours later to catch the returning light, of course the
guide number is NOVA

This is a mostly academic exercise, however. Our view of Jupiter is
always a Jupiter in full sun, so there is no need to try to use flash.

I suppose one could try to fill the shadows of one of the moons, but
they are usually quite small and most people don't notice them unless
they are pointed out.

The more interesting challenge with Jupiter is knowing where to aim
the flash. If you just point it at the bright spot in the sky, you'll
be in the general direction, but that spot is where Jupiter was (I
think) 4-6 hours ago. The exact time depends on where both Earth and
Jupiter are in their orbits.

Austin