Eyepieces for a Binotron/Refractor
Posted 27 August 2013 - 07:07 AM
Looking at what I already have I also have 2 x 21mm Denks on the way.
Posted 28 August 2013 - 08:04 AM
Posted 28 August 2013 - 08:55 AM
I used to have some 82 degree ES 14 mm, but the eyerelief was too tight for me.
Posted 28 August 2013 - 10:51 AM
Posted 28 August 2013 - 10:02 PM
Sell everything else or if you can get Denk 14's....the best 14mm eyepiece ever made IMO.
Wow that would be a bit tough I would really have a hard time parting with any of the EP's I have, but I will certainly have a look at getting a couple of 14's,,,,,thanks Matt.
I am thinking of 2 x 24mm Televue Pan's
Posted 02 September 2013 - 12:53 AM
Posted 02 September 2013 - 07:05 AM
Posted 02 September 2013 - 08:08 AM
I used a pair of 19mmm Pans in my old Denk IIs, but it was too much power in high power arm for my own scope.
I wanted 24 widefeilds to work, but just could not get past the vignetting.
Posted 02 September 2013 - 09:02 AM
Posted 02 September 2013 - 01:46 PM
In medium, it was minor, but in my rather bright skies, I still could see it.
22mm Pans were completely free of visible vignetting in straight though, but I could still see some minor vignetting in low power.
It may be a very personal thing though.. Wasn't my own cup of tea but it appears that many people are OK with it.
Posted 03 September 2013 - 12:04 AM
Would like to see 2 TV24Pans hanging off the binotron for comparison.
Posted 08 September 2013 - 09:33 PM
I'm in a similar position to you, with the Binotron 27 coming and needing eyepieces for it. Had my first look through a Pan 24 on the weekend(mono mode). In my 12" dob and using a Paracorr I thought the view was stunning. The only thing holding me back from going with the Pans at the moment is some of the talk about vignetting. I may yet consider getting the Binotron without the eyepieces and borrowing the Pan 24 again for a look and see how bad the vignetting is.
Anyone else gone done the Binotron 27/Pan 24 road?
Posted 09 September 2013 - 07:19 AM
And I had the same issue with the Denk II. Even 22mm Panoptics vignetted wiht the low power arm, but 19mm Panoptics did not.
And the field stop of the D21s is right in the middle of the field stop for the 22mm Pans and the 19mm Pans,
There is no doubt that the D21s are what they are (only 65 degrees AFOV and about 21.6mm in focal length).
Think about it. Denkmeier could make the eyepeice whatever size that they wanted, and if you could make it with a Panoptic sized field stop, why wouldn't you make it with a Panoptic sized field stop...
Well, if it didn't work very well, and you wanted to ofer the best possible off axis performance in the widest
possible field of view, you would tailor the eyepeice to the Binoviewer to get exactly what you needed to offer excellent views in all three modes.
And that would be the D21. A reasonably wide apparent field, with a reasonably wide field stop with a reasonalbly low power and a reasonably high power.
D21s Are I believe the ultimate eyepeice for the Binotrons.
Posted 09 September 2013 - 08:11 AM
Posted 09 September 2013 - 09:10 AM
I fuss over a lot of this stuff, but a lot of people will tell you they are satisfied.
So, it comes down to how much compromise you want to make.
If a little vignetting doesn't bother you, use the 24mm Pans. Other people do and seem happy enough.
So, don't let my own insistence on perfection color the practical aspects of it all.
Unless you want perfect too. Then you really have to do your homework, and with binoviewers, you may find real perfection almost impossible to achieve. Somewhere along the line, you have to make compromises. It is really that simple.
Posted 10 September 2013 - 01:31 AM
Posted 10 September 2013 - 06:56 AM
Have to say I really like the Denks, I would like to try the Pans but they are 2" in diameter and not sure if there would be any room for my nose.
I believe that you might find the opposite to be true in practice. In direct comparison, I find the 24mm Pans to be more accommodating and comfortable than the 21mm Denks.
Posted 10 September 2013 - 07:21 AM
While the biggest diameter of the eyepeice is quite wide, there is a very deep taper from the eypiece eyeguard to the wider part of the body to allow clearance.
Of course IPD may be an issue, but many people report room to spare from an IPD standpoint.