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10" f6.3 Eyepieces

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#1 Jack Frost

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Posted 11 July 2004 - 06:05 AM

I was thinking of these eyepieces for starters. Can you let me know if you agree or not!

35mm Panoptic - 45x
22mm Nagler - 71x
12mm Nagler 131x
7mm - 225x

What do you think the highest realistic magnification will be in the scope? A 5mm Nagler will give me 315x magnification, but I don't know whether the conditions will ever be good enough for that? :question:

#2 Lucifigus

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Posted 11 July 2004 - 07:49 AM

I find it curious that you list the EP in terms of magnification, rather than FOV. For mags less than 200x, i find I select on the basis of true FOV. I have a 12.5 f/6 and similar EPs and I can offer the following.

As a wide EP, I use a 40 Pentax XL and find it quite wonderful. With a f/6.3, you could use it, or the newer XW and still keep the exit pupil at 6.4 mm. This will give you a TFOV of >1.6°, which is about as wide as you can get with this scope. Myself, I would always want a little more field if I was using the 35 Panoptic. YMMV

I have both the 22 Nagler and the 17 Nagler. I find generally I use the 17 Nagler more often, however I like an EP with a bit more than a 1° field for looking at things like the Leo triplet and other galaxy groups. So I would select the 22 as a first jump from the 40mm. You may find this OK or you may want to consider the 17 - both are superb EPs to my eye.

I tend to make EP jumps in the .5° range, so that would lead me to get the 13 Nagler for .67°. I have never looked through the 12 Nagler, but smaller size would make me go with the 13 (and I have).

The 7 Nagler is a good choice. You should be able to use this level of magnification a lot, on both planets and globular clusters.

Although this depends a lot on your local conditions, on good nights, or if you use fans to cool your mirror, you should be able to go above 300x on planets with some success. A 2.5x Powermate with the 13 Nagler will give you 308x.

Please understand that EP selection and happiness is a very personal thing. We all have different ways of looking at things and determining what we like and dislike about various EPs. You are simply going to have to make some purchases and determine for yourself. Just because people really rave about the 22 Nagler, doesn't mean you should feel compelled to like it. Fortunately Astromart will allow you to find what works best for you.

Good Luck,

Gary Weber

#3 Jack Frost

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Posted 11 July 2004 - 08:11 AM

Okay. Is this better? :)

35mm Panoptic - 1.4°
22mm Nagler - 1.1°
12mm Nagler 0.6°
7mm - 0.3°

#4 Don W

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Posted 11 July 2004 - 10:39 AM

For which scope? You don't give much to work with.

#5 Jack Frost

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Posted 11 July 2004 - 02:25 PM

It's a 10" refractor. :D

No, it's...

10" reflector
Fan cooled primary
1/10 PV
Double eccentric circular spider
50.8mm low profile focuser
9x50 finder
150cm long
10kg weight
White tube
Red writing
On Losmandy G11 Mount
With Gemini

I think that just about covers it. :)

#6 Don W

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Posted 11 July 2004 - 02:30 PM

See.....I would not have guessed that. The only commercial 10" f/6.3 that I know of is the Meade 10" SCT.

I think your choices will work well. You may want to add a barlow or Powermate for those rare nights of excellent seeing for high mag planetary observing.

#7 Jack Frost

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Posted 11 July 2004 - 02:40 PM

Okay. Excellent.

I was going to opt for the 12" or 14" reflectors, but I thought I'll get the 10" and with the money I save, get some eyepieces.

I'll have a snoop around and see how much the Powermate is.


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