YKSE

BTW: Does anybody knows if all the 24 Pans are the same, no matter how old, or are there any different versions?

That's actually an interesting question

On one hand, Televue indeed doesn't mention any changes about Panoptic, on the other hand, Televue doesn't announce all the improvement to their eyepieces either. Take Radians as an example, if you read enough, especially comments on other sites, you'll get quite different opnions about Radians' transmission and colour tint, and my guts feeling is that people were talking about different Radians (Televue hadn't anounced any changed about Radians), as shown in here.

Panoptics have been around for longer time than Radians, only Televue knows the answer to your question. If I were you, I would prefer a newer Panoptic over an older one. Just my two cents.

Nice collection Paul   that 18mm BCO looks like a midget there

Why do I have a feeling that a new case is needed? 

Another few months and there will be a few more re-brandings of this range I guess. If / when William Optics produce one I'll bet it will be labelled "101 degrees"

I can't say that I'd be surprised then

Looks like that TS has the cloned MWA here:

http://www.teleskop-express.de/shop/product_info.php/info/p7921_TS-SWA-100--Ultra-Series-21mm-2--Xtreme-Weitwinkel-Okular.html

Constant 16mm eye relief, 6 lens in 4 groups, some variation of 12mm T4 Naglers?

I have yet to post a pic of my EP case, but I do enjoy reading everyone else's posts and oggling at the glassware. I might just have to succumb to posting a picture of my incomplete EP case

Go ahead and do it.   Just don't make it a habit to continueously update it,  that'll be a costly habit.

Agnes,

A question about your calculation of refractors, are those achromats or perfect APOs? I'd assume that there're some differences in fine contrast between these two types, because of the chromatic aberrations in achromats.

Sorry, just opened it in google chrome. It must be that my Internet Explorer is of older version.

Very interesting work Agnes, thanks for sharing

I have difficulty in accessing the source code link giving in your blog, can't download it either.

 just not sure what to do with it yet.

You put the pictures in this thread, what else can you do with it now?

Nice one, Mr. Spock, the case and the eyepieces seem to have been very stable to me.

Great first light Alan, looks like the one magnitude increase from 12" does make great difference, in addition to better optics

Mine is from 2013, S26403, starbright XLT coatings, orange tube, not going anywhere to my knowledge

Mike,

Nice piece of work as well as the EPs.   you'll have only two small spaces left to fill after 3.5XW

Thanks for the explanation, John  14.7psi, that's a good imperial joke.

My own eyepieces are pressurized with a nitrogen-oxygen-argon mix to 14.7psi.  Always have been.

May I ask what do you see advantage to have EP purged?

Have you seen any sign of the much discussed "edge of field brightening" with the LZ Yong ?

John,

Here's someone sees EOFB both in LZ and 20mm ES 100 degree, maybe you can better estimate how bad EOFB is in LZ.

http://www.cloudynights.com/topic/487681-best-es-nagler-eyepieces-for-an-f10-8-edge-sct/?p=6388238

Have you seen any sign of the much discussed "edge of field brightening" with the LZ Yong ?

Yes, I see "edge of field brightening" (EOFB)in my LZ sometimes too, I think it also depends on observers, some see EOFB in virtually 40-50% of EPs they've tried, some see nothing. Personally I don't find EOFB in LZ distracting, partly it's not there all the time, also you can zoom-in to make EOFB disappear, also that I observe on axis only with my tracking mount. I'd like to think that EOFB is not much worse than "ring of fire" in some ultra wide angle EPs.

Don't be. It was a painful experience....

These have all gone to new homes, hopefully being enjoyed still though. It did break my habit of never letting go of anything!

It's a funny thing though, I still really enjoy using my Orthos instead, no idea why!!

Stu, Leica Zoom with VIP balrow  is more cost-efficient than this full case of EPs, IMHO.

Optically I've only compared LZ with my BCOs and Nikons, LZ is best, even though differences on-axis is very small. but the fexibility of zoom makes it first choice in observing.

I don't think it'll make much difference if it's marketed as 65° or 72°, the physical limit of Field Stop(FS) determines the FOV you can see in a eyepiece.

2" eyepiece has outer diameter 50.8mm, with wall thickness of 2mm (measured from my 2" eyepieces) of the 2" nosepiece, the inner diameter is 46.8mm, and the Field Stop will be even slightly smaller than that, so the measured FS of 46.57mm is about as big as physically possible.

As Michael mentioned above, the pincushion in the eyepiece may account for the discrepancy, but don't make any real world difference.

My guess is that 65° AFOV is more correct than 72°.

The Field Stop(FS) of 42 LVW is measured as about 46.57mm by a CN member (he has loads of eyepieces), that is the widest of ANY 2" eyepieces, so it gives the widest possible TFOV of a 2" eyepiece.

Or we can do some math, TFOV can be calculated in two ways:

1. TFOV = AFOV / magnification

2. TFOV = FS *57.3/ FLscope

we get

AFOV/magnification = FS *57.3/FSscope

that leads to

AFOV = FS *57.3*magnification/FSscope =FS * 57.3 /(FSscope/magnification)

and magnification/FSscope is actually focal length of the eyepiece, that gives

AFOV = FS * 57.3 / FLeyepiece = 46.57*57.3/42=63.53

And that CN member measure 63.5°

You've obviously got too much time on your hands 

Dave

Was it that obvious?   Two half clear nights in a whole month   Better to do something fun and save a few bugs than to complain the weather was the idea.

After adding some new toys, the case looks a little different:

Drawing:

Schema:

The case:

Plantins,

Congratulations  , those three cases are super-heavy weight collections, not only quality wise, literally too.

That's a superb collection of eyepieces, Gavster, congratulations

Nice collection there, Derek. Your wallet might sense some danger when there's a empty spot in the case