Altair ULTRAFLAT?

[Nightspore]

Does anyone know anything about or have any experience with these eyepieces?

 

https://www.altairastro.com/Altair-15mm-ULTRAFLAT-Eyepiece-Stainless-Steel.html

 

 

As far as I know they don't seem to be Barsta, Long Perng, Guan Sheng Optical or Synta.

[Nightspore]

APM?

 

https://www.apm-telescopes.de/de/okulare/58-74-weitwinkel/apm-ultra-flat-okulare.html

[+Streetbob]

I bought the 15mm at PAS.  I find that my varifocal glasses don't give the best views with my 82 deg eyepieces so thought I'd give it a try.  The 15mm works really well for me and gives me better viewing.  They are well made, feel solid and aren't as expensive as 82 deg eps.  Stars stay accurate for most of the FOV, but do loose shape close to the edge.  I'm thinking of trying the 10mm.

[Nightspore]

3 hours ago, Streetbob said:

I bought the 15mm at PAS.  I find that my varifocal glasses don't give the best views with my 82 deg eyepieces so thought I'd give it a try.  The 15mm works really well for me and gives me better viewing.  They are well made, feel solid and aren't as expensive as 82 deg eps.  Stars stay accurate for most of the FOV, but do loose shape close to the edge.  I'm thinking of trying the 10mm.

Thanks for the info. What was the focal ratio of the scope you were using it in? I was thinking of the 15mm for my ED80 as it would give a 2mm exit pupil. 

Edited April 4, 2019 by Nightspore

[+Streetbob]

I’ve used it in my 200mm reflector and Starwave 102 refractor and have liked the view in both. I’ll take it along to the meet on Saturday. If you can make it you can see it at least. 

[Nightspore]

7 hours ago, Streetbob said:

I’ve used it in my 200mm reflector and Starwave 102 refractor and have liked the view in both. I’ll take it along to the meet on Saturday. If you can make it you can see it at least. 

OK thanks. I also have a 102mm, f/7 Altair Starwave. So if it's good in an f/7 scope it should be good in the f/7.5 ED80.

[Nightspore]

Think I'll try the Luminos ... when the clouds go!

 

[Nightspore]

I've pulled the trigger on the 15mm ULTRAFLAT. Watch this space lol.

[Nightspore]

 

Daylight tests in the ED80 seemed OK. The eyeguard rolls down nicely. I'm not so sure of the claimed 16mm eye relief. Seems more like 12-13mm to me. I can believe the 65° AFOV although they may be rounding it up a little.

 

 

Similar in overall size and appearance to the 19mm TV Panoptic.

 

 

It's a more manageable size for me on the ED80 than the Luminos.

 

 

It will be interesting to see how it compares with the 15mm HR.

[Nightspore]

I had a good session with the 15mm ULTRAFLAT last night (ED80). I'm quite impressed, stars were sharp virtually across the field and I could detect no hint of false colour or any astigmatism. definitely a keeper!