Power

Ok, the reason for the slight differences in answers you are
getting.....333 x and 339 x...is because some people are rounding
off the 25.4 mm per inch conversion value....some are just going
with 25 mm per inch which gives a 1600 mm FL, divided by 4.8 eyepiece,
which gives 333 power. Others are multiplying 64 inches times 25.4
mm/inch to come up with a FL of 1625.6 mm and dividing that value
by 4.8 eyepiece, = ~ 339 X....so, depending upon how much accuracy
you want, take your pick.
Clear Skies,
Tom W.




Starlord wrote:
Can someone say what power of mag I'm at using the following?

Dob 8in F8 (64inch?) 1.25 eyepiece 4.8mm Nagler


--
In This Universe The Night was Falling,The Shadows were lengthening
towards an east that would not know another dawn.
But elsewhere the Stars were still young and the light of morning lingered: and
along the path he once had followed, Man would one day go again.

Arthur C. Clarke "The City & The Stars"

SIAR
www.starlords.org
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I think the Meade 25WA is about the lowest I could go on this F8 scope, as it is
when I use it I get the feeling I've to fall threw the EP into outer space! And
with that 4.8 on the moon last night, I could swear I got poked in the eye by a
mountain top!


--
In This Universe The Night was Falling,The Shadows were lengthening
towards an east that would not know another dawn.
But elsewhere the Stars were still young and the light of morning lingered: and
along the path he once had followed, Man would one day go again.

Arthur C. Clarke "The City & The Stars"

SIAR
www.starlords.org
Bishop's Car Fund
http://www.bishopcarfund.Netfirms.com/
Freelance Writers Shop
http://www.freelancewrittersshop.netfirms.com

"Richard DeLuca" wrote in message
news
In article ,
t (Ratboy99) wrote:


Dennis,

There's your answer for you. And by the way, the focal length of your
scope (1626mm) divided by 17mm (your 17mm TeleVue) gives you 95.65X. By
the same method, your MEAD 25mm gives 65X, your UO 12mm gives 135.5X,
and your 6mm gives 271X. A well-rounded set of eyepieces......

Starry Skies,
Rich


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"Chris L Peterson" wrote in message
...
On Sat, 12 Jul 2003 11:33:56 -0700, "Starlord"
wrote:

Can someone say what power of mag I'm at using the following?

Dob 8in F8 (64inch?) 1.25 eyepiece 4.8mm Nagler

339? Is this a trick question?


It's perhaps worth bearing in mind that:

1. The mirror is almost certainly not precisely 8" (203mm) in diameter

and:

2. Even more certainly, the focal ratio is almost certainly not precisely
f/8.

It's unlikely that either have more than 2 digits of precision, so quoting
the resulting magnification to lots of significant figures is unwarranted.

Probably the most one can reasonably say is that it's "more than likely
somewhere between 330x and 340x".

Regards,

Chris