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eyepieces for vixen bt81s-a f/5.9

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#1 bakerrihan

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Posted 13 December 2013 - 01:19 PM

hi binoculars and eyepieces forms :)
i Bought vixen bt81s-a i am using good quality kellners 40 deg
and parks 30mm 50 deg for 16x and now want more fov
i have some questions need to be answered before buy new set

i made a survey in the market and all my questions will be about these eyepieces
1) Baader Hyperion Modular 24mm ,17mm ,13mm
2) Explore Scientific 68° 24mm 16mm 11mm 82deg
3) Meade Series 5000 HD-60 25mm , 12mm
4) Tele Vue Delos 17.3mm 12mm


now the questions :)
1) MOST IMPORTANT QUESTION: which set comes into focus with bt81 ?
2) which is the best set for fast scope like mine ?
3) the baader is cheap IT IS GOOD LIKE OTHERS es or tv -sharp,bright,high contrast ?
4) which one is the brightest ?
5) last thing give me a over all % for all sets note forget the price ?

here is some info may will help
focal length =480mm , objective lens 80mm , ranges want for mag 19-43x .

i will be grateful for help thanx so much
clear sky

baker rihan :D

#2 csrlice12

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Posted 13 December 2013 - 01:56 PM

My first choice based on quality would be #4, although you might consider the 10mm Delos rather then the 12mm.

My second choice would be #2, the ESs are pretty decent, even in fast scopes.

But my personal choice would be to get the ES68* 24, and the two delos. The ES68* 24mm will give you the max fov for a 1.25" eyepiece and is a very, very good eyepiece. The delos are delos and they don't come much better then that. Unfortunately, this is also probably the more expensive route....but YGWYPF mostly in this hobby.

#3 bakerrihan

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Posted 13 December 2013 - 02:15 PM

can i ask why 10 is better than 12 on the other hand 48x is dimer than 40x 1.6mm exit pupil vs 2.04mm exit pupil and thanx for your help :)

#4 csrlice12

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Posted 13 December 2013 - 02:38 PM

Either would do, the 10 would give you a litle wider spread. Both are great eyepieces. The other reason for the 10 is if you do get an ES68 24mm, you could barlow it for a 12mm. And you will notice some difference between a 12 and 10mm. Nothing wrong with a 2.06mm exit pupil for me, but YMMV.

#5 bakerrihan

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Posted 13 December 2013 - 02:41 PM

ok thanx alot

#6 JustaBoy

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Posted 13 December 2013 - 02:42 PM

Randy,

You do understand that he is asking for eyepieces for a Binocular Telescope, don't you?

-Just checking, because you mentioned barlowing.

Thanks,
-Chuck

#7 bakerrihan

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Posted 13 December 2013 - 02:42 PM

do you know any info about baaders

#8 csrlice12

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Posted 13 December 2013 - 02:47 PM

oops, just looked at the 80/480....didn't realize its for a binoscope.

#9 JustaBoy

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Posted 13 December 2013 - 02:49 PM

It's the "BT" in the model #:-)

-Chuck

#10 JustaBoy

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Posted 13 December 2013 - 02:53 PM

Nice!
http://www.vixenopti...ulars/bt81.html

#11 Vondragonnoggin

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Posted 13 December 2013 - 02:56 PM

I frequently use barlows in my GBT 70/90 F/6.2 binocular telescope.

The 24 Pans/ES 68 degree will vignette. the max clear aperture that BT has is probably about 22mm. Hopefully they vignette the same way they do in the APM 100ED Semi-apo. The vignette clips entire outer FOV cleanly. No edge darkening. It wiill not utilize full FOV, but the field stop will look sharp.

#12 Vondragonnoggin

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Posted 13 December 2013 - 02:57 PM

16x - 48x is a reasonable expectation from the Vixen BT.

I like this one personally

2) Explore Scientific 68° 24mm 16mm 11mm 82deg








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