Scratch this one off the list. Serious design flaw. So now the question is, 16 or 17 Nagler?
Delos 17.3---VERY Sad
Started by
SkyRanger
, Mar 30 2012 09:33 PM
79 replies to this topic
#27
Ava
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Viking 1
Posted 07 April 2012 - 02:03 PM
Baader sells a 2"-1.25" adapter that would fit the bill, only 1mm optical path length (less than 0.04"). Part #15A, you can check it out here:
http://www.teleskop-...-Baulaenge.html
Can be used as adapter or permanent solution for a specific eyepiece. Should be available in any US shop that sells Baader adapters I guess.
//Anders
http://www.teleskop-...-Baulaenge.html
Can be used as adapter or permanent solution for a specific eyepiece. Should be available in any US shop that sells Baader adapters I guess.
//Anders
#28
ed_turco
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Mercury-Atlas
Posted 07 April 2012 - 04:08 PM
Thus creating a need for the Paracorr Type 3 that will be announced at NEAF much to the chagrin of those who invested in the Type 2 over the last year.
It is a very clever business model that plans for incremental improvements over the years. Does this mean that the designer didn't get it right the first time?
Why?
Surprised this hasn't come up before.
#29
helpwanted
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Fly Me to the Moon
Posted 07 April 2012 - 06:18 PM
Great, TV is going to mimic Apple and get us to but a new Paracorr every year with our iPads & iPhones?
I agree with skipping this 17.3 and just wait and hope for a parfocal 12.
I agree with skipping this 17.3 and just wait and hope for a parfocal 12.
#30
Lee D
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Posted 08 April 2012 - 01:01 AM
TV should offer a 1.25"-2" adapter designed to make the 17mm parfocal with all the other 1.25 eyepieces (except Ethos), when the others are used with some "standard height" (TV I'm sure) adapter. And maybe not charge the typical startling amount for it, as a way to show some goodwill. Actually they should start putting it in the box with the eyepiece.
I'll check their return policy. I've decided maybe I just don't want to mess with the thing, over this one issue.
I'll check their return policy. I've decided maybe I just don't want to mess with the thing, over this one issue.
#31
Jeff Morgan
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James Webb Space Telescope
Posted 08 April 2012 - 07:56 AM
I'll check their return policy. I've decided maybe I just don't want to mess with the thing, over this one issue.
Perspective.
I seem to have an instinctive need to play with focus whenever I change eyepieces. Since I have a nice focuser, parfocal has never been an issue for me.
OTOH, getting a great eyepiece is of great importance to me. Less than 3/16" more infocus than the 31 Nagler? I can manage that. I'll just make my Newtonian truss poles a little bit shorter, and of course no issue at all on the refractor. I can't imagine SCT owners will have any issues at all.
#32
helpwanted
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Fly Me to the Moon
Posted 08 April 2012 - 12:29 PM
It's not the parfocal for me, it the fact that it doesn't have a Paracorr position.
If I have to settle with "close enough" in the paracorr, I'll just keep my XWs.
If I have to settle with "close enough" in the paracorr, I'll just keep my XWs.
#33
Guest_sniperpride_*
Guest_sniperpride_*
Posted 08 April 2012 - 02:59 PM
I dont use paracorr for my Delos, I find it well corrected, and at 72* fov I dont detect coma in my f4.5
#34
Pollux556
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Apollo
Posted 08 April 2012 - 09:07 PM
I am reminded that some Speers Waler serie 1 ep had this problem in some Dobs
#35
Richard Low
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Posted 08 April 2012 - 10:10 PM
I am keeping my XWs. I also have the Ethos to fill in the focal length at 17mm. Sometimes when i observed through the Ethos with my glasses on, the Afov is around 70 degrees, so this make up for the Delos 17.3
#36
johnnyha
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Posted 09 April 2012 - 01:35 PM
There is a very real chance if you have a short-tube "bino-friendly" refractor and you normally employ an extension to reach focus, that you may have to remove the extension for this one eyepiece. I did not have this problem but the increasing distance between the focal point of the Ethos and the 17.3 Delos is worrisome.
Frankly I had minor problems with blackouts (maybe its my eyes getting older) but primarily I did not like the weight in my binoviewers compared to my 19mm Pans. The 19mm Pans won out for me. Of course they only have 13mm eye relief but I don't view with my glasses on and I find the Pan most comfortable for me.
Frankly I had minor problems with blackouts (maybe its my eyes getting older) but primarily I did not like the weight in my binoviewers compared to my 19mm Pans. The 19mm Pans won out for me. Of course they only have 13mm eye relief but I don't view with my glasses on and I find the Pan most comfortable for me.
#37
dscarpa
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Skylab
Posted 09 April 2012 - 02:11 PM
I've had a 17.3 Delos for a couple of weeks and it's already one of my favorites up there with my Ethos and XWs. Barlowed it's very easy to use with images of the Moon, Mars and Saturn being truly excellent. I have cats and a refractor. I did notice it wasn't parfocal with my 24 Pan. The Delos and Pan do make a very nice DSO team well worth a bit of refocus for me.David
#38
mark8888
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Mercury-Atlas
Posted 09 April 2012 - 06:12 PM
I have cats and a refractor. I did notice it wasn't parfocal with my 24 Pan.
With your refractor, could you estimate how much you had to turn the focuser to go from the 24pan to the 17.3 Delos?
#39
Scanning4Comets
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Markus, a.k.a. Scanning4Comets
Posted 09 April 2012 - 06:23 PM
As I stated in the beginning of this thread, I was kinda bummed out, but parfocalizing eyepieces is simple! Go see my pic on page one of this thread! I said I wouldn't get the 17.3mm Delos because of the extra focus travel needed, but after some thought, it is a really easy fix!
First, you put the eyepiece in your focuser that needs the most "in" travel on your focuser. After that, remove that eyepiece and just leave the focuser exactly where it is. Now, take your other eyepieces and slowly put them into the focuser until you get a good focus and use the set screws, or compression ring to lock the next eyepieces in place and use a thin erasable marker to mark the eyepiece barrel just above the lip of your focuser. All you have to do now is use strong rubber gaskets to put just above the mark you made on your other eyepiece barrels!!!....Now when you use your eyepieces, they will all focus at the same distance in your focuser !!!
If you use a paracorr, well, I guess that maybe another story, LOL!
First, you put the eyepiece in your focuser that needs the most "in" travel on your focuser. After that, remove that eyepiece and just leave the focuser exactly where it is. Now, take your other eyepieces and slowly put them into the focuser until you get a good focus and use the set screws, or compression ring to lock the next eyepieces in place and use a thin erasable marker to mark the eyepiece barrel just above the lip of your focuser. All you have to do now is use strong rubber gaskets to put just above the mark you made on your other eyepiece barrels!!!....Now when you use your eyepieces, they will all focus at the same distance in your focuser !!!
If you use a paracorr, well, I guess that maybe another story, LOL!
#40
Mr. Bill
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Cosmos
Posted 10 April 2012 - 01:27 PM
Just a reminder....TV website ep specs page gives fieldstop location referenced from the ep shoulder for all their current eps.
Use it and there will be no more surprises after ordering TV eps.
Use it and there will be no more surprises after ordering TV eps.
#41
SkyRanger
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Posted 10 April 2012 - 09:48 PM
NO luck getting the D17 to focus in my 8" dob. There is just no way to get more infocus other than shortening my poles- which I am not willing to do. With only a 1.25 focuser there is no way to play tricks with adaptors. Next time I will check the stats and not assume!
Gordon
Gordon
#42
John Rhodes
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Posted 11 April 2012 - 12:49 AM
Gordon,NO luck getting the D17 to focus in my 8" dob. There is just no way to get more infocus other than shortening my poles- which I am not willing to do. With only a 1.25 focuser there is no way to play tricks with adaptors. Next time I will check the stats and not assume!
Gordon
Try re-collimating the mirror with it as forward toward the focuser as possible that you can get good collimation... this often works.
#43
Richard Low
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Posted 11 April 2012 - 04:32 AM
Gordon,NO luck getting the D17 to focus in my 8" dob. There is just no way to get more infocus other than shortening my poles- which I am not willing to do. With only a 1.25 focuser there is no way to play tricks with adaptors. Next time I will check the stats and not assume!
Gordon
Try re-collimating the mirror with it as forward toward the focuser as possible that you can get good collimation... this often works.
looks like i really wont be able to try out this eyepiece in my dobs as i may not have enough in-focus and Paracorr issues...sigh...
#44
SkyRanger
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Posted 11 April 2012 - 05:16 AM
John, Thanks for the tip, but I have tried moving the mirror forward already--just not quite enough slack with the PB8. I am disappointed since I really enjoy the D6 and D10. At least for now, I will stick with the N17 in my scopes with 2" focusers.
Gordon
Gordon
#45
Guest_sniperpride_*
Guest_sniperpride_*
Posted 11 April 2012 - 07:39 PM
Gordon, does it work with your 12.5?
#46
Pingu
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Mariner 2
Posted 11 April 2012 - 07:43 PM
Thankfully, I haven't a problem at all with my D17 in my XT8.
#47
SkyRanger
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Posted 11 April 2012 - 07:49 PM
Snipe, my 12.5 is loaned out to a friend. It has a 2" focuser, and I predict the D17 would work in the larger Portaball. I love the Nagler 17 in that scope and at this point I am sticking with the Nagler. The D17 sold quickly on a site we all know of, and I am sending it out with tear drops on its huge eye lens.
Gordon
Gordon
#48
jeffdetweiler
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Lift Off
Posted 26 November 2012 - 09:38 PM
Astro Systems makes a 2" - 1 1/4" adapter in which a 1 1/4" eyepiece drops about 1/2" down into the adapter to give you an extra 1/2" of in focus
#49
Sarkikos
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ISS
Posted 26 November 2012 - 10:39 PM
Jeff,
I agree. I never got this preoccupation with parfocality - is that a word? - in eyepieces. That factor flies well below my radar. I don't give a fig if my eyepieces are parfocal or not. I just don't get it. What's a focuser for?
On the other hand, it is not a good thing if an eyepiece needs more focus or less focus than my focuser will allow. I'd rather not deal with extensions and low-profile adapters.
Mike
I seem to have an instinctive need to play with focus whenever I change eyepieces. Since I have a nice focuser, parfocal has never been an issue for me.
I agree. I never got this preoccupation with parfocality - is that a word? - in eyepieces. That factor flies well below my radar. I don't give a fig if my eyepieces are parfocal or not. I just don't get it. What's a focuser for?
On the other hand, it is not a good thing if an eyepiece needs more focus or less focus than my focuser will allow. I'd rather not deal with extensions and low-profile adapters.
Mike
#50
Deep13
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Posted 27 November 2012 - 12:34 AM
If it doesn't come to focus, it is not really an eyepiece. Swing and a miss from TV.
And as far as moving the mirror forward a tiny bit with collimation, 1. what does the scope's manufacturer say about that? 2. why should have screw around with that? Shouldn't the eyepiece work with commercially produced scopes as they are? I can see mickey mousing it with an eyepiece made from spare lenses you got from Surplus Shed or with a DIY scope, but not a "premium" "EP" on a Newt that works with ever other EP.
And as far as moving the mirror forward a tiny bit with collimation, 1. what does the scope's manufacturer say about that? 2. why should have screw around with that? Shouldn't the eyepiece work with commercially produced scopes as they are? I can see mickey mousing it with an eyepiece made from spare lenses you got from Surplus Shed or with a DIY scope, but not a "premium" "EP" on a Newt that works with ever other EP.
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