Televue Range ? - Can anyone explain it to me please

[BRUN]

Could someone explain to me, or is their a list anywhere, of the different types of televue ep's on offer ?

Im new to this hobby but it seems they are some of the best EP's but they all have different names and im not sure what the differences are.

Thanks

[Moonshane]

http://www.televue.com/engine/TV3b_page.asp?id=214

Main differences are AF  = apparent field. This governs maximum possible sky in one view when combined with focal length of scope and eyepiece. Total field if view is approximately AF divided by magnification stated in degrees. So an AF  of 50 and a magnification if 50x = true field of 1 degree. More AF or less magnification = more true field. Magnification = focal length of scope e.g. 1000mm  divided by focal length of eyepiece = e.g. 10mm  gives magnification of 100x.

Other differences mainly er  = eye relief which is how close you need your eye to the glass to see whole field.

Weight too is a good indicator of likely price.

[Cornelius Varley]

This is the start page for the eyepiece range http://www.televue.com/engine/TV3b_page.asp?ID=2

[RT65CB-SWL]

As far as I know, each have a different apparent field of view, (AFoV).

Plossl = 50 degrees.

Nagler zoom = 50 degrees.

Radian*/DeLite = 60 degrees.

Panoptic = 62 degrees.

Delos = 72 degrees.

Nagler = 82 degrees.

Ethos = 100 to 110 degrees (depending on type).

 

* the Radian eyepieces were discontinued a few years ago.

[BRUN]

thanks guys, very helpful

[25585]

On 09/02/2017 at 13:49, BRUN said:

Could someone explain to me, or is their a list anywhere, of the different types of televue ep's on offer ?

Im new to this hobby but it seems they are some of the best EP's but they all have different names and im not sure what the differences are.

Thanks

Televue was my first prime eyepiece. They pioneered specialising in long eye relief eps and I have stuck with them mainly.

 

[Ricochet]

On 02/09/2017 at 14:11, Philip R said:

As far as I know, each have a different apparent field of view, (AFoV).

Plossl = 50 degrees.

Nagler zoom = 50 degrees.

Radian*/DeLite = 60 degrees.

Panoptic = 62 degrees.

Delos = 72 degrees.

Nagler = 82 degrees.

Ethos = 100 to 110 degrees (depending on type).

 

* the Radian eyepieces were discontinued a few years ago.

Delite is 62 and Panoptic 68

[Charic]

On 02/09/2017 at 13:49, BRUN said:

............. the different types of televue ep's on offer ?
 .......it seems they are some of the best EP's but they all have different names and im not sure what the differences are.

Thanks

I thought the same? even bought a few ( Plössl's ~ Delos ) but now I have none!

Take a peek around their web site, all the info is there, http://www.televue.com/engine/TV3b_page.asp?ID=2

I presently have an f/6 reflector telescope, and the benefits of these eyepieces are not so apparent  on this, or  even slower scope's, except maybe for the wider field of view,  and the shortest focal length 8mm in their Plössl  range was of some concern, as I needed an even  shorter focal length, 6mm, possibly shorter?

With the eyepieces in my present collection, I get as good an image as I did with the Delos ( my eyes and observation ) so I'm quite satisfied with the present setup. 
I also wanted to just try a Delos  (comparing with Starguider, see what the fuss was about?) so bought the first Delos, second hand ( even second hand, a used Delos = Four BST Starguiders ! ) and two more Delos thereafter. also with the intention of obtaining a faster scope say a 300mm or 250mm in that order, due to the focal ratio on each scope!

Don't get me wrong, their good eyepieces (Delos) if you need them?  I don't for now, but you won't know until you have tried them.
One thing for sure,  a Tele Vue eyepiece will sell and sell and keep selling? I think the reason is because of their good reputation, their build quality and construction, but not only that, once you have tried one, you'll either try to buy the rest or( like me ) consider if they are really all that good in the first place, considering their cost new, and the fact that there are several and many cheaper brands all doing just as good a job! 

[BRUN]

thanks, good advice, this is only a side hobby to me so probably not worth me spending TV money on EP's

[avtaram]

11 minutes ago, BRUN said:

thanks, good advice, this is only a side hobby to me so probably not worth me spending TV money on EP's

Have a look at the Vixen SLV eyepieces from FLO.

I have compared these with the TV Delos to view the Moon, and found the SLVs revealed more detail than the Delos which to me was surprising and unexpected.

Avtar

[Charic]

6 hours ago, BRUN said:

.................... probably not worth me spending TV money on EP's

If you have a fast scope, or intend to purchase a fast scope, then Tele Vue are proven/tested to work on scopes, down to f/4. That's a deal breaker for some folk, others may say, buy once, buy the best!
Its getting hold of them, that's the problem, and If you can afford to buy and sell, then that may be your only option. I'm more than satisfied with the route I traveled to get this far!
Your scope's optical design is faster  than mine, and most scopes will work just fine when viewing on axis, right down the middle of the  view,  but dare to look at the edge of your field of view, things can get a little ugly, the Stars distorted, mostly caused by the telescope itself?
Spend enough money on certain eyepieces and you can help alleviate some of these defects, not necessarily eradicate them.

If your interest is just for visual observations, then the sharper the field of view, the less you have to move the scope, especially one like mine, but if you can keep up with the movement of what your looking at, then on axis, all should be good, costing much less at the eyepiece.

Whatever you choose or desire, it wont be perfect for everyone, such is the nature  of the subject regarding eyepieces. All that really matters is to find what works best for you, and you alone!

[DRT]

Tele Vue's Eyepiece Calculator is a great tool that allows you to see the difference in specification of their entire range in any given scope:

http://www.televue.com/engine/TV3b_page.asp?id=212&plain=TRUE

 

[BRUN]

Thanks guys, ive just changed scope to a Celestron 8" Nexstar Evolution Edge so im hoping its not as fussy on EP's, though in all honesty ive had some cracking views with the stock EP's on my dob

[SkyGibbon]

Your Edge will be forgiving with eyepieces. A good set of possls would even work well.

[25585]

Strange FLO does not sell TV, but does other good makes.