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17mm and 18mm EPs For Mark V Binoviewer

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#1 Kent10

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Posted 04 August 2014 - 06:43 PM

Hi All,

 

I recently received an internal double stack for my LS152 solar scope.  The DS views are very nice with my Mark V binoviewer.  However, some of my eyepieces don't work because they require too much in-focus.  Specifically my 17.3mm and 14mm Delos.  I was very disappointed because I really need these magnifications.  My 16mm Brandons are great, my Pentax XW 20mm just barely come to focus and the 24mm and 19mm Pans are also great.  I think I will try the 14mm Pentax XW because I have plenty of in focus left on my 10mm ones and I think the 14mm should work then too.  The 12mm Delos work well but are sometimes too much power.

 

So I am thinking about filling in the gap between my 19mm Pans and 16mm Brandons.  I know some might feel I don't need those magnifications and I am still experimenting but depending on seeing those magnifications might come in handy.

 

Any recommendations for 17mm and/or 18mm eyepieces that don't need a lot of in focus. 

 

These are ones I am considering.

 

17mm Sterlings.  They don't seem to be in stock though.  Are the Astro-Tech the same or very similar?

 

18mm Takahashi Abbe

 

18mm Takahashi LE

 

Vixen 17mm LVW.  These look very heavy though.  Heavier than the Delos and Pentax I think.

 

Right now I am leaning towards the 17mm Sterling or Astro-Tech and 18mm Takahashi Abbe.

 

Are there any others I should consider?

 

Thanks very much, Kent

 

 

Added--    I also have some 25mm Sterling Plossls that I tried and they did not reach focus.  I wonder if the 17mm would be different. 


Edited by Kent10, 04 August 2014 - 07:07 PM.


#2 JustaBoy

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Posted 04 August 2014 - 07:27 PM

Hi,

 

I like the Vixen.

 

It is not as heavy as it looks and is actually lighter than Delos.

 

http://www.eyepieces...G_p/4100130.htm

 

http://www.eyepieces...5_p/8101170.htm

 

 

Thanks,



#3 Starman1

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Posted 04 August 2014 - 07:41 PM

The Sterling Plossls (and the identical Astrotech Hi-Grade Plossls) have been discontinued by the manufacturer.

Plus, they took a lot of additional in-focusing.

You might try the Starguider ED eyepieces in 18mm.  Very sharp and inexpensive to boot.

To see all your choices:

email me at Pensack1@gmail.com and I'll send you the 2014 Buyer's Guide to Eyepieces

(the attachments haven't shown up on the posts here on CN, yet, or I'd link you to the thread in the Eyepieces Forum).



#4 Kent10

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Posted 04 August 2014 - 07:58 PM

Hi,

 

I like the Vixen.

 

It is not as heavy as it looks and is actually lighter than Delos.

 

http://www.eyepieces...G_p/4100130.htm

 

http://www.eyepieces...5_p/8101170.htm

 

 

Thanks,

Thanks Chuck.  I had been looking at this site for the specs and it said 1lb 4oz.  Now I wonder about the focus travel :o)

 

http://www.optcorp.c...ece-1-25-2.html



#5 Kent10

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Posted 04 August 2014 - 08:04 PM

The Sterling Plossls (and the identical Astrotech Hi-Grade Plossls) have been discontinued by the manufacturer.

Plus, they took a lot of additional in-focusing.

You might try the Starguider ED eyepieces in 18mm.  Very sharp and inexpensive to boot.

To see all your choices:

email me at Pensack1@gmail.com and I'll send you the 2014 Buyer's Guide to Eyepieces

(the attachments haven't shown up on the posts here on CN, yet, or I'd link you to the thread in the Eyepieces Forum).

Thanks very much Don.  Too bad about the Sterlings and Astrotechs.  I do see the 17mm Astrotechs are still available for sale but if the in focus is too much then they would be useless for me.  Also, thanks for the the offer to send your excellent guide.  I already have it and actually have been using it to make these choices.  I just don't know about the focus travel.  Thanks again.



#6 Kent10

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Posted 04 August 2014 - 08:30 PM

The 18mm Starguider does look good.  I hadn't heard of them before and will look into it.  Yes great price.



#7 Starman81

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Posted 05 August 2014 - 12:06 AM

I once had a pair of 18mm Radians for BV'ing (not mentioned in the OP's post, I know)... I had high hopes for them, but when BV'ing the Moon I got some serious kidney-beaning, so they were out. I did like them for non-lunar observing though. 



#8 Mike B

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Posted 06 August 2014 - 03:48 PM

Couldn't help ya re: the focal travel issues.... but in general i can atest that the Vixen 17-LVWs are mighty sweet bino'd! :waytogo: ... as are the 22's.



#9 Kent10

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Posted 06 August 2014 - 03:52 PM

Thanks Mike.  Yes tough to know if they will focus without actually trying them.  I thought I read somewhere the Vixens do need a lot of in focus.  Do you find that they do compared to some of your other eyepieces.  Thanks again.



#10 Mike B

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Posted 06 August 2014 - 04:36 PM

I may be able to try a few EPs, incl. the LVWs, and see where they fall for focal position in *my* scopes... maybe that'll give you some sense of the thing? Has never been an issue for me in any scope i've used, so never paid much notice.

 

Not sure what it is, but there are tantalizingly few candidates in the FL range that provide the wide+ER+sharp trifecta so beautifully captured by the longer FL LVWs. 24 & 19 Pans = 2 out of 3, same for the old or new Meade/Celes/ES SWA's in the 16-24mm range. The 17+24 Hyperions may be a close approx.? Some of the older UO 'Super Erfles' & 'Konigs' are quite good in these FLs, but are tantalizing shy on ER... and "sharp" is highly relative to scope type & FR. The LVWs just kinda mop up! :ubetcha:



#11 Kent10

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Posted 06 August 2014 - 05:07 PM

That would be great if you can think about it next time you are out to check the Vixen focusing.  I can't find now where I saw that the Vixen requires a lot of in focus.  It would certainly be a good option if it didn't need so much in focus.  The 22mm looks interesting too because I don't have anything between my 24mm Pans and 20mm Pentax :)



#12 JustaBoy

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Posted 06 August 2014 - 05:11 PM

Please don't do yourself a disservice by settling on anything else until you have determined that they will not work. - Hyperion and Stratus are just look-alikes; not the same at all.



#13 Scanning4Comets

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Posted 06 August 2014 - 05:49 PM

Neither of the two Vixen LVW's require a lot of in focus in 1.25" mode. If you use 2" mode, they will need a lot of "out focus"

 

Compared to my three Delos eyepieces, My Delos need about 1/4" more out focus compared to my 22mm and 17mm Vixen LVW's, so I have added a few O-rings onto my Delos eyepieces to make them parfocal with my LVW's

 

I hope this helps Kent!

 

Cheers,



#14 Kent10

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Posted 06 August 2014 - 05:57 PM

That is very helpful.  Thanks!  Next time I use my Mark V binoviewer on my solar scope I can check if 1/4 inch will work.  I have the 12mm Delos so I can compare with that and see if I have 1/4 inch room left. 



#15 gnowellsct

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Posted 06 August 2014 - 11:17 PM

For binoviewing you should consider scoring some of the used XL Pentax series

 

http://www.astromart...?article_id=716

 

Greg N



#16 CeleNoptic

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Posted 07 August 2014 - 02:47 AM



The Sterling Plossls (and the identical Astrotech Hi-Grade Plossls) have been discontinued by the manufacturer.

 

Don,

 

Are you sure they've really done it? I can see three of Sterlings, the 4, 12.5 and 20mm, listed on Long Perng website . I suspect, they read this famous forum and may want to continue manufacturing at least these three :grin: .



#17 JustaBoy

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Posted 07 August 2014 - 11:02 AM

If you still have something to sell you have to let buyers know.

 

Doesn't mean they are still making them.

 

To still be making the 4mm and not the 25 mm would be st....:-)



#18 beatlejuice

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Posted 07 August 2014 - 12:13 PM

If you still have something to sell you have to let buyers know.

 

Doesn't mean they are still making them.

 

To still be making the 4mm and not the 25 mm would be st....:-)

 

Or, in a more civil manner:  they are just selling off the last remaining stock. :grin:


Edited by beatlejuice, 07 August 2014 - 03:07 PM.


#19 Kent10

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Posted 07 August 2014 - 03:26 PM

I tried my 12mm Delos in the binoviewer today and there was just over an 1/8" left on the focuser so I guess the Vixen LVW's won't work for me in this case. :(

 

Greg, great article.  I have seen it before but don't own any XLs.  But as of today I will own all of the XW's.  I found a 30mm last week and have been really enjoying the 40mm (also new to me) the last couple nights.  I have the 20, 14 and 10 in bino pairs.  Would the XL's do something the XWs don't? Or do you recommend them because of the different focal lengths.  I see there is a 21mm.  Unfortunately no 17mm.

 

Thanks!



#20 Mike B

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Posted 07 August 2014 - 04:27 PM

But as of today I will own all of the XW's.  I found a 30mm last week...

 

Well, major congrats are in order! That's a toughie to find these days!

:bow:



#21 Kent10

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Posted 07 August 2014 - 04:44 PM

Thanks Mike.  The 30mm and 40mm I just received are in like new condition too.  So I am very happy.  You know, I avoided getting a 40mm because I thought my astigmatism would make the views bad.  The brighter stars do give odd shapes but I can position my eye to get rid of it if I have to.  I then miss some of the field but still the low power views are fantastic.  Then I avoided the 30mm because I have the Nagler 31mm but after getting the 40mm and seeing how comfortable and beautiful it was I then wanted the 30mm.  I just got it 10 minutes ago and found a place for it in my case.  Maybe tonight I will check it out.



#22 Mike B

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Posted 07 August 2014 - 05:08 PM

...Then I avoided the 30mm because I have the Nagler 31mm...

 

Oh, you already have the 31mm Terminagler? :foreheadslap: Then waht would you EVER need a pedestrian 30mm superwide for? You should sell it to me, cheap, and quickly- before i change my mind. :fishing:



#23 Kent10

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Posted 07 August 2014 - 05:12 PM

 

...Then I avoided the 30mm because I have the Nagler 31mm...

 

Oh, you already have the 31mm Terminagler? :foreheadslap: Then waht would you EVER need a pedestrian 30mm superwide for? You should sell it to me, cheap, and quickly- before i change my mind. :fishing:

 

:grin: 20mm eye relief and possibly better contrast.  With the higher high relief it might be easier for me to adjust for my astigmatism like I can do with the 40mm.



#24 Mike B

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Posted 07 August 2014 - 05:52 PM

Yes, you & me BOTH, sir, you & me both.

 

Had a chance a few years ago to try a guest's 30mm XW in my Dob (F4.55+Paracorr)... right there & then i KNEW this was an EP to work towards acquiring! It turned the heavens into a bejeweled feast for the eyes!

:waytogo:








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