best low power eyepiece

[qld]

what is the best low power eyepiece for a 25 inch f5 obsession and a 16inch f4.7 ,galaxy mirror obsession (made to order) with or without a paracor ,over 55 yrs and money is not a issue,when you get to that age as every night is a good night.

[wavelandscott (Scott)]

Without a lot of consideration and thought I'd list the following that I have uses in no particular order...keeping in mind no expense is spared

Pentax XW 40 mm
Pentax XW 30 mm
Televue 31 mm T5 Nagler
Televue 35 mm Panoptic
Televue 21 mm Ethos

I own the Ethos and it is an amazing eyepiece...it is huge but quite something to look through!

[dannat (Daniel)]

i prefer to keep the expense down, edmund rke 28mm

[qld]

mate i use them for book ends

Originally Posted by dannat

i prefer to keep the expense down, edmund rke 28mm

[AstroJunk (Jonathan)]

That's easy, the 31 Nagler is the only low power eyepiece worthy of your scope.

I cheaped out and bought the 35 Panoptic and boy can you tell the difference!

For medium powers, buy anything with the word 'ethos' on it!

[HCR32 (Peter)]

31 Nagler
21 Ethos

period!

[Suzy]

Take a look at this thread- it is very informative (and not just about Naglers either). http://www.iceinspace.com.au/forum/s...ad.php?t=16269

[Archy (George)]

Interesting replies: but do those replying to Qld base their replies on actual experience with a 25 inch f5 Obsession?

[AstroJunk (Jonathan)]

Originally Posted by Archy

Interesting replies: but do those replying to Qld base their replies on actual experience with a 25 inch f5 Obsession?

An f5 25" SDM, an f5 30" SDM, 2 x f5 20" SDM's and an f4.5 18" Obsession. Do they count?

[wavelandscott (Scott)]

Originally Posted by Archy

Interesting replies: but do those replying to Qld base their replies on actual experience with a 25 inch f5 Obsession?

15, 18 and 20s only...assuming that they'll be similar

[Archy (George)]

Originally Posted by AstroJunk

An f5 25" SDM, an f5 30" SDM, 2 x f5 20" SDM's and an f4.5 18" Obsession. Do they count?

Yes

[jamespierce (James)]

21mm ethos for my money, naglers sadly seem pedestrian to me now for wider fields.

[Archy (George)]

Originally Posted by jamespierce

21mm ethos for my money, naglers sadly seem pedestrian to me now for wider fields.

an Ethos 21 will give 151 magnification: Do you consider that to be low power?

[JethroB76 (Jeff)]

I think Scott has covered most the options.

Do you have a suggestion Archy?

[jamespierce (James)]

Originally Posted by Archy

an Ethos 21 will give 151 magnification: Do you consider that to be low power?

Yes, the field of view is much of a muchness between a 31 nag, 35 pan and 21 ethos. Higher power with a wide field of view is an advantage increasing contrast and pulling out more detail.

[AstroJunk (Jonathan)]

Originally Posted by jamespierce

naglers sadly seem pedestrian to me now for wider fields.

How true

[Archy (George)]

Originally Posted by jamespierce

Yes, the field of view is much of a muchness between a 31 nag, 35 pan and 21 ethos. Higher power with a wide field of view is an advantage increasing contrast and pulling out more detail.

Is this is based on your personal experience with the eyepieces in an F5 25 inch scope?

[jamespierce (James)]

Ok I'll bite, but this is the last time. Have I looked at those three eye pieces, side by side in a 25" F5 on the same night... no. Have I looked at all those eyepieces in a wide range of large fast scopes... yes. While the field will be slightly wider in the NAG or PAN options, the exit pupil is also getting huge, over 6mm for the NAG and over 7mm for the PAN, unless you have young, and perfectly dark adapted eyes you're just not going to be seeing all the photons. Anyway, enough numbers and conjecture on an internet forum, in reality any of those eyepieces is going to look great in a big scope like that, and we're all just talking about the last 10%.

[Archy (George)]

Originally Posted by jamespierce

Ok I'll bite, but this is the last time. Have I looked at those three eye pieces, side by side in a 25" F5 on the same night... no. Have I looked at all those eyepieces in a wide range of large fast scopes... yes. While the field will be slightly wider in the NAG or PAN options, the exit pupil is also getting huge, over 6mm for the NAG and over 7mm for the PAN, unless you have young, and perfectly dark adapted eyes you're just not going to be seeing all the photons. Anyway, enough numbers and conjecture on an internet forum, in reality any of those eyepieces is going to look great in a big scope like that, and we're all just talking about the last 10%.

Actual experience and numbers is what it is all about.

FYI the difference in FOV between the NAG31 and the ETH21 is 21%, which is not inconsequential.

At a dark site, where else for a 25" scope even old eyes can get to 6mm eye pupil, so a NAG31 is not out of the question, the power is lower and the FOV is broader so that the observer can see 46% more sky.

[qld]

it seems to me that in this forum televue low power eyepieces agree with every one ,and the type of tele vue chosen is largely a personal choice(BIT LIKE PICKING A SPORTS CAR) I was hopeing that other brands of eyepieces may have been nominated by experienced users and i invite those commentators to express their point of view as it may generate more knowledge and information for end users like myself, before this thread is dead buried and creamated thanks all

Originally Posted by Archy

Actual experience and numbers is what it is all about.

FYI the difference in FOV between the NAG31 and the ETH21 is 21%, which is not inconsequential.

At a dark site, where else for a 25" scope even old eyes can get to 6mm eye pupil, so a NAG31 is not out of the question, the power is lower and the FOV is broader so that the observer can see 46% more sky.