which E.S focal length first

[Daniel-K]

Rory i had 18mm for a while and it was great EP it stayed in the focuser most of the night untill i wanted to up the mag. very cheap as well £120 i think

[jetstream]

There is a discussion on the Nav HW V's Ethos topic here:

http://www.cloudynights.com/topic/321773-nikon-nav-17mm-hw-eyepiece-compared-to-ethos-17-mm/

The Ethos is as much as I'm prepared to pay for an eyepiece (and those have to be used) so I'm not tempted by the Nikon NAV HW's. I did think about a Docter 12.5mm for a short while and enquired about it on the CN forum but was not overwhelmingly convinced by the responses.

I'll have to "make do" with my Ethoi

I've just realised that this is rather off topic from ES eyepieces - apologies to the original poster.

Yes the discussion of BST,LVW and Nikon is off topic, but on topic the ES 82 and 100's are very good eyepieces, the 18mm compares favorably with other EP's of similar focal length. It gives fantastic contrast on objects like M42 and has a nice TFOV. Hard to go wrong with a widefield ES. Have fun with your choice Rory!

[swamp thing]

I've just realised that this is rather off topic from ES eyepieces - apologies to the original poster.

Sorry John my bad 

Apologies OP

[John]

The only ES eyepiece I've owned / used was the ES 20mm 100. It was a very, very good eyepiece

There was one on UK Astro Buy & Sell for £200 delivered earlier today which seems a pretty good deal.

[rory]

No apologies needed guys , good reading .

I notice that from 18mm upward they are 2" format. Do you find it hassle swapping over adapters .

[Daniel-K]

The only ES eyepiece I've owned / used was the ES 20mm 100. It was a very, very good eyepiece

There was one on UK Astro Buy & Sell for £200 delivered earlier today which seems a pretty good deal.

I bagged this

[bingevader]

You'd be better off with one of these  

Oh my goodness! Shocking case of the misplaced decimal point. 

Any legal grounds for insisting on paying the marked price of only 1.29 euros for it?!

[YKSE]

Oh my goodness! Shocking case of the misplaced decimal point. 

Considering that the EiC-14 is included which effectively change the EP to 14mm, you get two 100deg EPs for the price, maybe not extremely shocking?

[jetstream]

No apologies needed guys , good reading .

I notice that from 18mm upward they are 2" format. Do you find it hassle swapping over adapters .

Hi Rory, I love 2" EP's and have 3, 1.25"-2" adapters that I will load up with the 1.25's. A worthwhile consideration may be the TV Equalizer to add some weight to the 1.25's for balance. There are other ways to balance though, magnetic knife racks etc. I use a 2" Baader Clicklock on my dob so the EP's/adapter fit right in there, no hassle at all.

[alan potts]

I may have considered the Nikon if at the time I started out with Ethos I even knew they existed. I found out about them when I already had 4 of Ethos range and one of them was the 17mm. I am very happy with my range of the now and will soon add the 4.7mm, though I have to declare I was not totally head over heels when I started but they have grown on me. This is a man that said what the heck does anyone want an eyepiece that has an 82 degree FOV for, red faced and wrong again,

Naughty people this is a thread about ExSc eyepieces and I only just noticed, sorry.

Alan   

[bingevader]

Considering that the EiC-14 is included which effectively change the EP to 14mm, you get two 100deg EPs for the price, maybe not extremely shocking?

Don't you think they're worth more than just over a euro then?

[rory]

Hi Rory, I love 2" EP's and have 3, 1.25"-2" adapters that I will load up with the 1.25's. A worthwhile consideration may be the TV Equalizer to add some weight to the 1.25's for balance. There are other ways to balance though, magnetic knife racks etc. I use a 2" Baader Clicklock on my dob so the EP's/adapter fit right in there, no hassle at all.

with a baader clicklock added to the path , does it make it difficult to get some eyepieces into focus .

I found this issue in a previous set up with a twist lock adapter .

[YKSE]

Rory,

My understanding is the SW 10" dob has longer focuser than the OO 10" Gerry has, with a Baader clicklock added, your might not have enough inwards focus-travel for some eyepieces.

Looking at Televue's Paracorr setting here, If the ES 30mm 82deg and ES 20mm 100 deg are similar to 31mm Nagler and 21mm Ethos, these two are very possible don't have enough inwards focus-travel, while ES 14mm 100deg (clone to Ethos 13mm?) should be fine with your dob.

[jetstream]

with a baader clicklock added to the path , does it make it difficult to get some eyepieces into focus .

I found this issue in a previous set up with a twist lock adapter .

Not sure about the SW 10" for focus point, I replaced the stock OOUK extension adapter with the Clicklock and all went well, except the 10E. For minor adjustment to the focus position I either put the primary mirror closer or farther away to the sec using the primary mirror cell springs. This should be do able though, the Clicklock is very handy switching EP's and there are "in" travel adapters out there or ones with a longer installed height. What I did is play around so my focus point for most EP's results in minimal drawtube intrusion into the light path.

[jetstream]

I just saw Yongs post, it is best to see if you can use these EP's, I can check my 30 ES & 18ES for relative focus position if you like.

[jetstream]

Yong, if I check the relative focus position differences then this should tell us if the ES focus point is far enough out?  I wonder what Rory has for existing EP's for comparison

[YKSE]

Yes, checking the relative focus position differences should be good enough. I think Nagler Zoom should be one of the most outwards postion among yours.

[rory]

That's the advantage with the 68* . I could go up to 24mm without having to jump barrel size .

[Special K]

The 24mm 82 degree looks very attractive for a widefield if the the 30mm weight is too high. The only serious negative I found on it was a number of complaints about the 2" threads for filters. It seemed a little inconsistent, as in not everyone complained, so think it could have been a poor batch. They all look good so just depends whether you want a high, medium, or low power, and maybe what type of object you're into at the mo.

[rory]

The 24mm 82 degree looks very attractive for a widefield if the the 30mm weight is too high. The only serious negative I found on it was a number of complaints about the 2" threads for filters. It seemed a little inconsistent, as in not everyone complained, so think it could have been a poor batch. They all look good so just depends whether you want a high, medium, or low power, and maybe what type of object you're into at the mo.

I've not used this 10" dob in anger as yet , just a quick test to see if the collimation was good.

But going on my previous observing tendencies , I'd say 90% dso and 10% planets. With globs and tight open clusters being favourites.

[Special K]

If you're anything like me you'll go round and round for three months, compile a spreadsheet, and then choose something unexpected in the end

(Having said that, the spreadsheet can be enlightening to know the pupil exits, etc.........)