i'll take your 100 and raise you some

[WayBig]

So for everyone who is disappointed by the Ethos' hopelessley restrictive 100 degree FOV

Explore Scientific 9mm 120 Degree Eyepiece - 2" - OPT Telescopes

Nitrogen is so 2010, Argon is where it's at this year

OPT / ES...if you're reading and need someone to try them out, PM me

[swamp thing]

:eek:Nitrogen is so 2010, Argon is where it's at this year

So are they now saying that you really need to purge Argon, and that purging Nitrogen was a waste of time.???

Or have they purged both??

Regards Steve

[WayBig]

I think it's nitrogen/argon in, air out. Not sure what advantage argon has over nitrogen.

I'd like to see them helium purged - might make them lighter

[Moonshane]

eventually they will do 180 degree eyepieces and then you'll get a great view of Uranus. (sorry).

[swamp thing]

I'd like to see them helium purged - might make them lighter

Now you could be onto something there.

[damnut]

Purging, have they tried syrup of figs :-), could not justify that price even if i had the dosh!

[JamesF]

eventually they will do 180 degree eyepieces and then you'll get a great view of Uranus. (sorry).

I'm almost ashamed to admit that I laughed

James

[John]

Every eyepiece has been tested in a meter of water, apparently. So it should be handy in low lying areas when the sea levels rise

I think everyone was horror struck when the Ethos prices came out at over $500 but look how many folks own one or more of those now.

Where next, I wonder

[TheThing]

Why pay to have waterproof EPs?!? Who is going to be out observing in the rain?

(Ok, I'll accept dew problems, but possibly overkill?)

[pete_l]

I think it's nitrogen/argon in, air out. Not sure what advantage argon has over nitrogen.

My double glazing is Argon filled (so I'm told - though since I'm in no position to test the statement I just take it on faith). Maybe the EP manufacturers do it ti keep more heat in

I'd like to see them helium purged - might make them lighter

Ahhh, but the molecule is a lot smaller so it would all leak out quicker. Which could be the reason for Using Argon instead of N2

[MjrTom]

The level of environmental sealing also helps with dust and particulate ingress as well I would suspect.

[bombassa]

My experience with these eyepieces is limited to a smallish 20 mm meade swa.

Is internal dew a problem with eyepieces with multiple elements? Or do they purge them because of some effect on the light?

Or something completely different?

[onlyme]

Every eyepiece has been tested in a meter of water, apparently.

underwater astro observing ?

[Moonshane]

would be good in a neutrino scope?

[ScubaMike]

From their web blurb

Pushing the boundaries of eyepiece design, Explore Scientific spent years developing the 120 degree eyepiece, adding to it the bonus of an Argon purged interior space ensuring that your investment is immune to the outside environment and your eyepiece never falls victim to a damp night.

What a load of twaddle.

If the air inside is dry, you'll get no condensation on the inside. If moisture can get in, it'll still get in despite being "agron purged"

Besides which, "agron purged" means the removal of Argon, it should say "purged with Argon". Condensation on the outside will not be affected by the exotic gas mix held between the lense.

The molecule of Argon (which is actually an atom as it is inert) is smaller than the Oxygen molecule, so will leak out quicker than a normal atmosphere. This would be replaced with potentially moist air, so this could work out to be a bad thing.

Typical of the rubbish they use for advertising these days, just like hair shampoo with "beta-ceranides" or whatever new word they make up this week.

I really thought people here would be a little more scientific and discount this kind of thing.

[Moonshane]

are you saying that my wife is wasting her money on Pro-ceramide R?? oh no!!!

[Ptarmigan]

would be good in a neutrino scope?

Hehee nice one

But it might implode that far down a mine if they have economised on the number of argon atoms inserted ?

[johninderby]

£850.00 ish to import one. Wonder what It'll cost when dealers here start selling it? What will edge distorion will be like?

So OK who's going to be getting one for Christmas this year.

John

[Moonshane]

for me at least, the 100 degree field is more than enough, bordering on too much already. I have a 13mm Ethos and really like it but I generally prefer to see the whole field stop comfortably if possible and with the Ethos that's difficult. therefore it's about the quality of the view for me. these eyepieces seem very very good but I think I'll stick to Naglers and Panoptics in the future.

[PeterW]

Love to get one, it is amazing the speed of development in the last few years! How long were naglers stuck at 82degrees?? Can't help but push the cost of the 80degree ep down, which can't be a bad thing. What's al nagler going to come out with next? Maybe time to invest in a plain old 100degree ep!

Cheers

PEterW

[Moonshane]

perhaps a cure for 100 degree fever is buy an Ortho. Then even a 60 degree field seems massive and a 100 degree field mental.

[John]

for me at least, the 100 degree field is more than enough, bordering on too much already. I have a 13mm Ethos and really like it but I generally prefer to see the whole field stop comfortably if possible and with the Ethos that's difficult.....

For Christmas Shane I'm going to make you a cardboard field stop so that you can stop your 100 degree Ethos down a bit

[Moonshane]

ha ha

I should probably stop moaning really. that said, I reckon I'd swap my 13 Ethos for a 12mm and a 17mm T4. any offers

[John]

ha ha

I should probably stop moaning really. that said, I reckon I'd swap my 13 Ethos for a 12mm and a 17mm T4. any offers

..... or hang on until a Delos in that focal length is released

[Moonshane]

true enough John

but I don't even wanna think about that