Jump to content


Photo

Delos and the plastic disk

  • Please log in to reply
52 replies to this topic

#1 ausastronomer

ausastronomer

    Surveyor 1

  • *****
  • Moderators
  • Posts: 1838
  • Joined: 30 Jun 2003
  • Loc: Kiama NSW (Australia)

Posted 11 October 2012 - 07:25 AM

Can anyone tell me which focal length Delos have the cheap plastic disc inside the lens barrel near the eye lens. Do they still have this or has TV changed and now supplying all focal lengths with metal retaining rings?

Cheers

#2 Damo636

Damo636

    Ranger 4

  • -----
  • Posts: 326
  • Joined: 16 Aug 2011
  • Loc: Co Fermanagh, Northern Ireland

Posted 11 October 2012 - 08:37 AM

The 10mm has it John. I don't know if Televue have changed it or have any plans to do so, but for me it really cheapened an otherwise superb eyepiece. It never actually came loose on mine, but did flex with nothing more than a blast from a bulb blower. I have since went back to a 10mm XW, partly because of this.

#3 deister

deister

    Vostok 1

  • -----
  • Posts: 172
  • Joined: 21 Feb 2007
  • Loc: Germany

Posted 11 October 2012 - 09:13 AM

Hello John,

only the 10mm has (or had) the plastic disc. If TeleVue changed this disc to a metal one i dont´t know. The 6mm and the 17.3mm i one have a solid metal disc.

TeleVue sent me a new plastic disc for exchange on my 10mm Delos.

#4 helpwanted

helpwanted

    Aurora

  • *****
  • Posts: 4521
  • Joined: 04 Jul 2007
  • Loc: Phoenix, AZ

Posted 11 October 2012 - 02:23 PM

i have the 10mm Delos, no problems with any disk... never took apart the eyepiece though... no need to.
i think with normal use, it's a non-issue.

#5 RodgerHouTex

RodgerHouTex

    Surveyor 1

  • *****
  • Posts: 1578
  • Joined: 02 Jun 2009
  • Loc: Houston, Texas, USA

Posted 11 October 2012 - 02:53 PM

I believe they are referring to the field stop which is at the bottom of the eyepiece and is exposed. You don't need to take the eyepiece apart to get at it.

#6 Alvin Huey

Alvin Huey

    Mercury-Atlas

  • *****
  • Posts: 2759
  • Joined: 17 Oct 2005
  • Loc: Greater Sacramento region

Posted 11 October 2012 - 04:53 PM

Mine came off two months ago. I can't find it.

#7 ausastronomer

ausastronomer

    Surveyor 1

  • *****
  • Moderators
  • Posts: 1838
  • Joined: 30 Jun 2003
  • Loc: Kiama NSW (Australia)

Posted 11 October 2012 - 05:26 PM

Thanks for the help everyone.

I was planning to buy the 6mm Delos. Yeah yeah I know, unfortunately Pentax don't make a 6mm XW do they :)

However, if the 6mm was the one with the cheap and nasty disk on the bottom I was going to pass on it. As the 6mm has "all metal construction" I will go ahead and buy it.

The 6mm focal length is one a have a need for, particularly in my 10" and 14" scopes, where it gives 214X and 267X respectively. I do have a 6mm UO HD ortho but I am getting too old and cranky for short eye relief these days.

Update
A 6mm Delos is now winging its way to beautiful Kiama on the NSW South Coast :)

Cheers,

#8 Scanning4Comets

Scanning4Comets

    Markus

  • *****
  • Posts: 13776
  • Joined: 26 Dec 2004
  • Loc: Canada

Posted 11 October 2012 - 06:30 PM

John,

Here is the bottom of the 6mm Delos I had in Feb of 2011. No plastic disc is on it at all. From drift timing the eyepiece several times the 6mm Delos gave me 196x/22' in my 10" F/4.72 Reflector.

Cheers,

Attached Files



#9 Scanning4Comets

Scanning4Comets

    Markus

  • *****
  • Posts: 13776
  • Joined: 26 Dec 2004
  • Loc: Canada

Posted 11 October 2012 - 06:36 PM

Here it is next to a ruler showing reference to the size. Subtract about 1/2", or just less than that because this is how much longer it is here with the Antares Twist Lock adapter on the eyepiece, and the twist mechanism on the eyepiece was up a little bit in this pic as well.

Attached Files



#10 Scanning4Comets

Scanning4Comets

    Markus

  • *****
  • Posts: 13776
  • Joined: 26 Dec 2004
  • Loc: Canada

Posted 11 October 2012 - 06:40 PM

Bottom of 6mm Delos with Antares Twist Lock Adapter on it...

Attached Files



#11 ausastronomer

ausastronomer

    Surveyor 1

  • *****
  • Moderators
  • Posts: 1838
  • Joined: 30 Jun 2003
  • Loc: Kiama NSW (Australia)

Posted 11 October 2012 - 07:00 PM

Hi Mark,

From those pictures I am guessing it is about the same size and weight as my 5mm Pentax XW?

Cheers,
John B

#12 Pinbout

Pinbout

    Cosmos

  • *****
  • Posts: 8035
  • Joined: 22 Feb 2010
  • Loc: nj

Posted 11 October 2012 - 09:56 PM

10mm delos

#13 Scanning4Comets

Scanning4Comets

    Markus

  • *****
  • Posts: 13776
  • Joined: 26 Dec 2004
  • Loc: Canada

Posted 11 October 2012 - 09:59 PM

Here is a pic showing my Pentax 5.2mm XL without the Antares Twist Lock adapter showing lengths both with the eye cup in the down and up positions respectively. Weight without the adapter is 1 pound. The wide angle 28mm Lens of my digital camera makes the perspective look "off", but measurements that I quoted on the pics are accurate from looking with the eyepiece next to the steel ruler.

Hope this helps John!

Cheers,

Attached Files



#14 GlennLeDrew

GlennLeDrew

    Voyager 1

  • *****
  • Posts: 10858
  • Joined: 17 Jun 2008
  • Loc: Ottawa, Ontario, Canada

Posted 11 October 2012 - 10:00 PM

If this plastic disk is merely the field stop, and is not doing double duty to hold the eyepiece together, that by itself should not put one off. But if it too easily falls off, that's not good.

#15 Scanning4Comets

Scanning4Comets

    Markus

  • *****
  • Posts: 13776
  • Joined: 26 Dec 2004
  • Loc: Canada

Posted 11 October 2012 - 10:04 PM

Here's a good thread:

10mm Delos in the house!

And here is the thread where that plastic ring fell off someones 10mm Delos below:

Delos 10mm what is this?

Cheers,

#16 ibase

ibase

    Aurora

  • *****
  • Posts: 4582
  • Joined: 20 Mar 2008
  • Loc: Manila, Philippines 121°E 14°N

Posted 12 October 2012 - 12:55 AM

Hi Mark, I'm very glad that the Delos 6mm that I got from you via trade doesn't have the plastic disk. :)

Best,

#17 Scanning4Comets

Scanning4Comets

    Markus

  • *****
  • Posts: 13776
  • Joined: 26 Dec 2004
  • Loc: Canada

Posted 12 October 2012 - 01:13 AM

Hi Hernando!

No doubt about that sir! I'm still enjoying the 7mm Pentax XW you sent me for the trade. :jump:

#18 Binojunky

Binojunky

    Mercury-Atlas

  • *****
  • Posts: 2883
  • Joined: 25 Dec 2010

Posted 12 October 2012 - 08:18 AM

Considering the price of the Delos eyepieces, plastic parts that come adrift should not be happening, not wishing to get flamed but as TeleVue prices seem on the up and up at a farly regular rate this plastic ring dropping off issue is in itself enough to put me off and consider other makes,JMPOV,DA.

#19 ausastronomer

ausastronomer

    Surveyor 1

  • *****
  • Moderators
  • Posts: 1838
  • Joined: 30 Jun 2003
  • Loc: Kiama NSW (Australia)

Posted 12 October 2012 - 08:36 AM

If this plastic disk is merely the field stop, and is not doing double duty to hold the eyepiece together, that by itself should not put one off. But if it too easily falls off, that's not good.


Hi Glenn,

Your and my opinions obviously differ dramatically on this. I don't pay $300 plus for any eyepiece with plastic rings that come adrift. Can you picture Zeiss or Leica designing and building an eyepiece in this fashion?

Cheers,

#20 Pinbout

Pinbout

    Cosmos

  • *****
  • Posts: 8035
  • Joined: 22 Feb 2010
  • Loc: nj

Posted 12 October 2012 - 08:42 AM

I don't pay $300 plus for any eyepiece with plastic rings that come adrift.



with tax and shipping it's closer to $400.

a plastic baffle to hide the smallest abberation that only if you knew what to look for you could find it.

it must show up on planets and the moon because of their brightness.

boy now I'm wondering what it is... :question:

:lol:

#21 dscarpa

dscarpa

    Gemini

  • *****
  • Posts: 3006
  • Joined: 15 Mar 2008
  • Loc: San Diego Ca.

Posted 12 October 2012 - 11:24 AM

My one of the first shipped 17.3 Delos has a metal disk. I like the look of that Antares twist-lock adapter and just ordered one. I want to be able to add a 1.25" eyepiece to the mix when I'm using 2" ones with a minimum of fumbling around in the dark. With a thumb screw type adapter on an eyepiece it doesn't fit into anything but giagantic bolt cases. Not so with the twist-lock. David

#22 Alvin Huey

Alvin Huey

    Mercury-Atlas

  • *****
  • Posts: 2759
  • Joined: 17 Oct 2005
  • Loc: Greater Sacramento region

Posted 12 October 2012 - 11:27 AM

I have been observing with mine without the plastic disk and it does NOT affect performance at all. In fact, I wholeheartedly recommend the entire Delos series if you want the ultimate in performance in deep sky or planets in any widefield eyepiece.

So that is why I didn't "miss" the ring...as I knew the true reason why TV put it there. I wouldn't get hung up by it.

This is coming from a Zeiss ZAO-II owner. I use both sets the ZAO-II for the deepest of the deep and the Delos if I need the field.

Back at TSP when TV brought the new Delos (14, 12, 8, 4.5 and 3.5), I along with other deep sky crazies played with them with several large telescopes and were very impressed. The telescopes we used...the smallest was a 28" reflector. Here is a short post on this thread.

I have the 4.5, 8 and 14 on order. :)

#23 northpole

northpole

    Sputnik

  • -----
  • Posts: 42
  • Joined: 28 Jun 2011
  • Loc: Ontario, Canada

Posted 12 October 2012 - 02:26 PM

I have the 6 and 10mm Delos, and I haven't had any issues with the disk. I think they are fantastic: sharp, flat field, less edge brightening than my Pentax XL's. The adjustable eyecup works really well. I'm looking forward to getting the 4.5!

Andre

#24 csrlice12

csrlice12

    Voyager 1

  • *****
  • Posts: 11246
  • Joined: 22 May 2012
  • Loc: Denver, CO

Posted 12 October 2012 - 02:35 PM

I don't pay $300 plus for any eyepiece with plastic rings that come adrift.



with tax and shipping it's closer to $400.

a plastic baffle to hide the smallest abberation that only if you knew what to look for you could find it.

it must show up on planets and the moon because of their brightness.

boy now I'm wondering what it is... :question:

:lol:


Odd, reminds me of the ES82* 8.8mm having to use a "felt disk" to prevent flaring.....Anyone notice a flaring problem without it?

#25 Scanning4Comets

Scanning4Comets

    Markus

  • *****
  • Posts: 13776
  • Joined: 26 Dec 2004
  • Loc: Canada

Posted 12 October 2012 - 03:04 PM

I have been observing with mine without the plastic disk and it does NOT affect performance at all. In fact, I wholeheartedly recommend the entire Delos series if you want the ultimate in performance in deep sky or planets in any widefield eyepiece.

So that is why I didn't "miss" the ring...as I knew the true reason why TV put it there. I wouldn't get hung up by it.

This is coming from a Zeiss ZAO-II owner. I use both sets the ZAO-II for the deepest of the deep and the Delos if I need the field.

Back at TSP when TV brought the new Delos (14, 12, 8, 4.5 and 3.5), I along with other deep sky crazies played with them with several large telescopes and were very impressed. The telescopes we used...the smallest was a 28" reflector. Here is a short post on this thread.

I have the 4.5, 8 and 14 on order.


Good stuff Alvin! If they compare favorably to the Zeiss ZAO-II's, it would be well worth grabbing a few Delos eyepieces! I had the 6mm, but only traded for less mag at the time, plus I just found it a big LONG ergonomically speaking which one can easily get used to.

Cheers,






Cloudy Nights LLC
Cloudy Nights Sponsor: Astronomics