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Equipment Discussions >> Eyepieces

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eklf
Pooh-Bah
*****

Reged: 05/12/07

Loc: Carrboro, NC
Re: 10mm XW & 13mm Vixen LVW.....too close? new [Re: russell23]
      #5565003 - 12/10/12 10:18 PM

Quote:



It is just my opinion, but I don't see where 60x to 120x is a gap that needs to be filled. As you already noted the 13mm LVW does not seem that different from the 10mm XW. And if you get a 17mm LVW you are going to find that it too is not that different from what you have with the 22mm LVW (55x vs 71x). When I had 20mm and 14mm XW's at one point with a 1000mm FL scope (50x and 71x) the difference in magnification was not enough to be useful. The jump to 71x was so small that the desire I had was to keep on going.

Dave




I agree 100% with Dave and jrbarnett. I extensively compared 22 LVW,17 LVW, 13 LVW and 10 XW in my 8 nch F6. The 17 LVW was too close to 22 LVW and 13 LVW was , likewise, too close to 10 XW. I almost went with 10 XW, but the 13 LVW was just too comfortable (even more so than 10 XW). So I replaced 10 XW with 7 XW to finall give 22 LVW, 13 LVW and 7 XW.


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Scanning4Comets
Markus
*****

Reged: 12/26/04

Loc: Ontario, Canada
Re: 10mm XW & 13mm Vixen LVW.....too close? new [Re: eklf]
      #5565039 - 12/10/12 10:40 PM

Quote:

I agree 100% with Dave and jrbarnett. I extensively compared 22 LVW,17 LVW, 13 LVW and 10 XW in my 8 nch F6. The 17 LVW was too close to 22 LVW and 13 LVW was , likewise, too close to 10 XW. I almost went with 10 XW, but the 13 LVW was just too comfortable (even more so than 10 XW). So I replaced 10 XW with 7 XW to finall give 22 LVW, 13 LVW and 7 XW.




Now, there's an even better idea!

I could keep the 22mm and 13mm LVW's and sell off the 10mm XW because I already have the 7mm XW....maybe even spring for a 5mm Vixen LVW !!!

Hence:

38mm Q70
22mm LVW
13mm LVW
7mm XW
5mm LVW


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ausastronomerModerator
Carpal Tunnel
*****

Reged: 06/30/03

Loc: Kiama NSW (Australia)
Re: 10mm XW & 13mm Vixen LVW.....too close? new [Re: Scanning4Comets]
      #5565058 - 12/10/12 10:55 PM

Hi Markus,

Is your scope not a 10"/F4.7 newtonian ?

If so, your calculations on magnification are incorrect. In a 10"/F4.7 scope the 10mm XW gives you 119X, compared to 90X for the 13mm Vixen LVW. That's a 33% increase in magnification and a big enough gap for me.

Cheers,


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iluxo
sage


Reged: 09/23/08

Re: 10mm XW & 13mm Vixen LVW.....too close? new [Re: Mike B]
      #5565069 - 12/10/12 11:04 PM

A more sensible set would be 5, 8, 13, 22 mm, or 7, 10,15, 25 mm.

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george golitzin
Carpal Tunnel
*****

Reged: 02/24/06

Re: 10mm XW & 13mm Vixen LVW.....too close? new [Re: Scanning4Comets]
      #5565122 - 12/10/12 11:30 PM

Quote:

Quote:

I agree 100% with Dave and jrbarnett. I extensively compared 22 LVW,17 LVW, 13 LVW and 10 XW in my 8 nch F6. The 17 LVW was too close to 22 LVW and 13 LVW was , likewise, too close to 10 XW. I almost went with 10 XW, but the 13 LVW was just too comfortable (even more so than 10 XW). So I replaced 10 XW with 7 XW to finall give 22 LVW, 13 LVW and 7 XW.




Now, there's an even better idea!

I could keep the 22mm and 13mm LVW's and sell off the 10mm XW because I already have the 7mm XW....maybe even spring for a 5mm Vixen LVW !!!

Hence:

38mm Q70
22mm LVW
13mm LVW
7mm XW
5mm LVW





I think that's a terrible idea. Unless you're totally in love with the 13 LVW, why the heck would you sell the 10XW?? For one thing, the jump from 13 to 7 is cutting your exit pupil almost in half: way too big a jump for my taste. I really like the "root 2" sequence I have: 20, 14, 10, 7, 5, 3.5. (The 10 and under are XWs, the 14 is a delos, and the 20 is the NT5.)

I think the 13 feels really close to the 10 not because of magnification, but because of tfov: the true fields of the two are very close, which is why you're thinking of selling. But the exit pupil/mag difference makes it worth holding on to the 13. Again, why sell an eyepiece that you like?

But, if you want a balanced sequence, consider that the geometric mean between 10 and 22 is 14.8--and since the 10 has slightly wider afov than the 22 lvw, a 14mm 70-degree eyepiece would feel close to the mean between the two. So save up your funds, sell the 13, and get a delos: that's my recommendation!

-geo.


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Damo636
sage


Reged: 08/16/11

Loc: Co Fermanagh, Northern Ireland
Re: 10mm XW & 13mm Vixen LVW.....too close? new [Re: george golitzin]
      #5565421 - 12/11/12 05:55 AM

If it were me, I would sell the 13mm and spring for either a 5mm LVW/XW at the high end, or a 30/31mm 82° at the low end. More often than not I jump straight from 21mm to 10mm but do on occasion reach for the 13mm if I need more fov to frame an object. I know for sure if I had anything between 13 & 21, it would end up not being used! I actually have been thinking lately if I had opted for the 17 Ethos over the 21mm, I could have skipped the 13mm altogether and had an even more minimalist line up

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Hermie
sage
*****

Reged: 04/20/05

Loc: Cloudy HKG
Re: 10mm XW & 13mm Vixen LVW.....too close? new [Re: Damo636]
      #5565610 - 12/11/12 09:38 AM

Marcus,

My basic set of eyepieces for my refractor are: Nagler 3-6 zoom, XW10 and LVW22. I know the step from 10 to 22 is quite big, but its OK for my refractor.

I like the LVW, but I will never sell the Pentax - that is just me.

I can accept your proposed 5 - 7XW - 13LVW - 22LVW line, and I think you would enjoy it. But I would really recommend to keep the Pentax. And an XW5 would be way better than the LVW5

So try the LVW13 for a while, and then decide. And don't look through any of those Ethy things!

Enjoy what you've got!

Hermie


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Scanning4Comets
Markus
*****

Reged: 12/26/04

Loc: Ontario, Canada
Re: 10mm XW & 13mm Vixen LVW.....too close? new [Re: Hermie]
      #5566300 - 12/11/12 04:59 PM

Thanks for the replies and suggestions all! Tonight I will be doing a shoot out between the 10mm Pentax XW and 13mm Vixen LVW! I'll do deep sky and planetary, (barlowed for planetary), and post my results!

May the better man win! Let's hope there isn't too much blood shed between the two contenders!

Cheers,


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Scanning4Comets
Markus
*****

Reged: 12/26/04

Loc: Ontario, Canada
Re: 10mm XW & 13mm Vixen LVW.....too close? new [Re: Scanning4Comets]
      #5566559 - 12/11/12 08:46 PM

I just came in for a bit to warm up after trying both eyepieces outside. The skies cleared up just in time for a quick peek. Both eyepieces are really good in their own right alone.

I tried both eyepieces briefly on some deep sky targets, and then on Jupiter with my 2" GSO ED barlow. With the barlow I get roughly close to 200x in the 13mm Vixen LVW and with the 10mm XW I get close to 230-240x. Tonight the skies were not perfect for planetary viewing, so 200x was just right over the 230x with the 10mm XW.

I might just keep them both because I can go down to 200x when the seeing is not optimal! I'm going to go out again later on, (my telescope is still outside), and I'll evaluate them both some more.

Cheers,


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Mike B
Starstruck
*****

Reged: 04/06/05

Loc: shake, rattle, & roll, CA
Re: 10mm XW & 13mm Vixen LVW.....too close? new [Re: Scanning4Comets]
      #5566879 - 12/12/12 01:07 AM

Quote:

Tonight the skies were not perfect for planetary viewing, so 200x was just right over the 230x with the 10mm XW.




I think that, right there, is the answer to this thread's question.


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Scanning4Comets
Markus
*****

Reged: 12/26/04

Loc: Ontario, Canada
Re: 10mm XW & 13mm Vixen LVW.....too close? [Re: Mike B]
      #5566928 - 12/12/12 02:17 AM

After getting out and testing a second time, I have come to the conclusion that both eyepieces are excellent in their own right, but mostly with a barlow.
With my 2" GSO ED barlow I get roughly 200x using the 13mm Vixen LVW with it and I get roughly 240x using the 10mm XW!

So, I will be able to swap back and forth between the two if I need to bump the magnification up or down according to the conditions. Both eyepieces are really nice too! I find the comfort and eye placement on the Vixen LVW's easier than the XW's, but I really love the immersion factor I get from the XW's, so with both the Vixen LVW's and the Pentax XW's, you get the best of both worlds!


Cheers,


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coutleef
Post Laureate
*****

Reged: 02/21/08

Loc: Saint-Donat, Quebec, Canada
Re: 10mm XW & 13mm Vixen LVW.....too close? new [Re: Mike B]
      #5567104 - 12/12/12 07:58 AM

Quote:

Quote:

Tonight the skies were not perfect for planetary viewing, so 200x was just right over the 230x with the 10mm XW.




I think that, right there, is the answer to this thread's question.





Absolutely mike

Depending on the seeing conditions you need Eps with FL closer to each other around that breaking point.

This is even more true when having multiple scopes. I have a 10 and 14 mm EP and use both of them


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