I don't see the point of this eyepiece...

[Ags]

I have never seen or heard of an eyepiece like this before?

https://www.vixenoptics.com/Vixen-Finder-Eyepiece-100-p/35203.htm

I don't see the advantage of this over a 56mm plossl. 11 degree AFOV must be a translation error?

[Moonshane]

It's probably correct but I don't see the point either. A 25mm Plossl would have more true field.

[Sunshine]

What is a "finder" eyepiece? 

[johninderby]

A very strange one indeed. 🤔

 

 

Edited July 15, 2020 by johninderby

[Ags]

Yes I read it again and it really is a 100mm 11° AFOV eyepiece. My immediate thought is it must be really unpleasant to use.

[Ruud]

Wasn't this eyepiece announced on 1 April a few years back?

[bomberbaz]

It's gotta be a mikey take. Even at F15 you have an exit pupil of near 7mm. In an F5 you would have 20mm exit pupil. 

Come on folks, it's a wind up. 

[bomberbaz]

actually scratch my last comment. I found It fits into this spotting scope

https://www.firstlightoptics.com/offers/hubble-cassegrain-reflector-telescope.html

Edited July 15, 2020 by bomberbaz

[Ruud]

Found it:

 

[John]

This one caught a few people out in April 2017

[Peter Drew]

It sort of makes sense.  It would have a similar true field of view on most telescopes to a regular finder, the large exit pupil light loss probably would not impact too much on the aperture of the main telescope and if nothing else it would always be perfectly aligned!    A bit pricey though.       🙂   

[andrew s]

8 hours ago, Peter Drew said:

It sort of makes sense.  It would have a similar true field of view on most telescopes to a regular finder, the large exit pupil light loss probably would not impact too much on the aperture of the main telescope and if nothing else it would always be perfectly aligned!    A bit pricey though.       🙂   

I thought that too, however, you  might have to look round the central obstruction on a Newtonian or Cassigrain type telescope!

A black dot finder.

Regards Andrew 

Edited July 16, 2020 by andrew s

[Don Pensack]

It was created to take the place of a finder in refractors.

It's just plain odd.

[Alan White]

16 minutes ago, Don Pensack said:

It was created to take the place of a finder in refractors.

It's just plain odd.

You can say that again Don!..... oh here you go, save you the trouble 😉

16 minutes ago, Don Pensack said:

It was created to take the place of a finder in refractors.

It's just plain odd.

 

[johninderby]

Now who is going to buy one just out of curiosity? 😁

Get four and use them as table legs perhaps? 🤔

[Ags]

It takes the crown as the eyepiece with most generous eye relief bar none.

[bomberbaz]

3 hours ago, Don Pensack said:

It was created to take the place of a finder in refractors.

It's just plain odd.

its a waste of glass if you ask me

[Louis D]

7 hours ago, johninderby said:

Now who is going to buy one just out of curiosity? 😁

Already been done nearly 2 years ago over on CN.

[johninderby]

I meant on SGL.

See my esrlier link to a review by a CN member.

Edited July 17, 2020 by johninderby

[Ags]

On 15/07/2020 at 22:54, Sunshine said:

What is a "finder" eyepiece? 

This Vixen is a "finder" eyepiece, but it is not a "keeper"!

[Sunshine]

With an 11 degree FOV i think the only thing it would find is how limited ones patience really is, using it would be like tracking a fly through a straw.

Edited July 17, 2020 by Sunshine

[bomberbaz]

Quick check on a spreadsheet shows a cheapish 32mm erfle in my 10" dob gives x38, 1.9 tfov and only a 6.8 exit pupil.

Use of this vixen gives x12, 0.9 tfov and 21mm of washed out exit pupil to play with.

Even with a F10 100mm frac the results are equally woeful. 

If the OTA is F15 then it's a possible maybe, other than that I wouldn't waste my time.

Sorry to be so negative, it's not like me but I really think vixen had a little something extra in the tea urn when they put this idea through from design. 

[Solar B]

I can think of a good use for one ... obtaining full disk with a Quark 🌞

Brian