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Equipment Discussions >> Eyepieces

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ausastronomerModerator
Carpal Tunnel
*****

Reged: 06/30/03

Loc: Kiama NSW (Australia)
Delos and the plastic disk
      #5464976 - 10/11/12 08:25 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


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Damo636
sage


Reged: 08/16/11

Loc: Co Fermanagh, Northern Ireland
Re: Delos and the plastic disk new [Re: ausastronomer]
      #5465031 - 10/11/12 09:37 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.

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deister
super member


Reged: 02/21/07

Loc: Germany
Re: Delos and the plastic disk new [Re: ausastronomer]
      #5465093 - 10/11/12 10:13 AM

Hello John,

only the 10mm has (or had) the plastic disc. If TeleVue changed this disc to a metal one i dontīt 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.


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helpwanted
Post Laureate
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Reged: 07/04/07

Loc: Phoenix, AZ
Re: Delos and the plastic disk new [Re: deister]
      #5465527 - 10/11/12 03:23 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.


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RodgerHouTex
Pooh-Bah
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Reged: 06/02/09

Loc: Houston, Texas, USA
Re: Delos and the plastic disk new [Re: helpwanted]
      #5465566 - 10/11/12 03:53 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.

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Alvin Huey
Carpal Tunnel
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Reged: 10/18/05

Loc: NorCal
Re: Delos and the plastic disk new [Re: RodgerHouTex]
      #5465744 - 10/11/12 05:53 PM

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

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ausastronomerModerator
Carpal Tunnel
*****

Reged: 06/30/03

Loc: Kiama NSW (Australia)
Re: Delos and the plastic disk new [Re: Alvin Huey]
      #5465781 - 10/11/12 06:26 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,


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Scanning4Comets
Markus
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Reged: 12/26/04

Re: Delos and the plastic disk new [Re: ausastronomer]
      #5465868 - 10/11/12 07:30 PM Attachment (123 downloads)

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,


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Scanning4Comets
Markus
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Reged: 12/26/04

Re: Delos and the plastic disk new [Re: Scanning4Comets]
      #5465883 - 10/11/12 07:36 PM Attachment (83 downloads)

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.

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Scanning4Comets
Markus
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Reged: 12/26/04

Re: Delos and the plastic disk new [Re: Scanning4Comets]
      #5465891 - 10/11/12 07:40 PM Attachment (79 downloads)

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

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ausastronomerModerator
Carpal Tunnel
*****

Reged: 06/30/03

Loc: Kiama NSW (Australia)
Re: Delos and the plastic disk new [Re: Scanning4Comets]
      #5465915 - 10/11/12 08:00 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


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Pinbout
Postmaster
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Reged: 02/22/10

Loc: nj
Re: Delos and the plastic disk new [Re: ausastronomer]
      #5466114 - 10/11/12 10:56 PM

10mm delos

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Scanning4Comets
Markus
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Reged: 12/26/04

Re: Delos and the plastic disk new [Re: ausastronomer]
      #5466116 - 10/11/12 10:59 PM Attachment (58 downloads)

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,


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GlennLeDrew
Postmaster
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Reged: 06/18/08

Loc: Ottawa, Ontario, Canada
Re: Delos and the plastic disk new [Re: Pinbout]
      #5466119 - 10/11/12 11:00 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.

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Scanning4Comets
Markus
*****

Reged: 12/26/04

Re: Delos and the plastic disk new [Re: GlennLeDrew]
      #5466125 - 10/11/12 11:04 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,


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ibase
Vendor Affiliate
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Reged: 03/20/08

Loc: Manila, Philippines 121*E 14*N
Re: Delos and the plastic disk new [Re: Scanning4Comets]
      #5466254 - 10/12/12 01:55 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,


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Scanning4Comets
Markus
*****

Reged: 12/26/04

Re: Delos and the plastic disk new [Re: ibase]
      #5466264 - 10/12/12 02:13 AM

Hi Hernando!

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


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Binojunky
Carpal Tunnel
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Reged: 12/25/10

Re: Delos and the plastic disk new [Re: Scanning4Comets]
      #5466538 - 10/12/12 09:18 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.

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ausastronomerModerator
Carpal Tunnel
*****

Reged: 06/30/03

Loc: Kiama NSW (Australia)
Re: Delos and the plastic disk new [Re: GlennLeDrew]
      #5466563 - 10/12/12 09:36 AM

Quote:

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,


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Pinbout
Postmaster
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Reged: 02/22/10

Loc: nj
Re: Delos and the plastic disk new [Re: ausastronomer]
      #5466568 - 10/12/12 09:42 AM

Quote:

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...



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