Eyepieces

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  • Member since
    November, 2013
Eyepieces
Posted by JEllis on Friday, November 15, 2013 9:42 PM

Hello,

 

I am new to the site and forum.  I have used an Orion XT-8 with the two eyepieces that came with the scope (SIRIUS 1 1/4 10mm and 25mm).  I impressed with the forum discussions on eye pieces and would appreciate advance on what additions I should make to enhance my viewing experiences.  Living in the California high desert, I want to start to take maximum advantage of my scopes capabilities.  The XT-8 is accommodates 2" eyepieces.  I am a novice but really want to make this a frequent hobby.  and any recommendations on upgrading my finder scope would be greatly appreciated.  I look forward to your replies and other future discussions.  Cheers!

  • Member since
    November, 2009
Posted by Poppa Chris on Friday, November 15, 2013 10:28 PM

I would probaly get a 2X Barlow to give you 2 more higher magnifications with your current EPs.  The go shopping for a 2" EP of something around 32mm in wide apparant FOV lof around 70degs to enhance your wide field views.  You can spenf quite a lot on this 2" piece of glass, but get the best you can afford.  While Televue is a standard of quality, there are lesser expensive EPs that are also quite impressive,  Baader Hyperions are a good choice. 

---Poppa Chris---

Denham Springs, Louisiana USA

"Second star to the right - Then straight on until morning!" - Peter Pan

Celestron CPC1100GPS (XLT) - 279mm aperature, 2800mm Focal length. (f10) Celestron Ultima LX (70deg AFOV) Eyepieces 32mm thru 5mm, Canon EOS Rebel T2i DSLR, Backyard EOS imaging software, Orion Star Shoot Planetary Imager IV, Celestron Skymaster 15x70 binoculars

 

  • Member since
    April, 2012
  • From: North Carolina east coast USA
Posted by stepping beyond on Saturday, November 16, 2013 2:47 PM

Jellis what your looking for is eye relief  whether it's 1 1/4 or 2 inch ep's . If you have an ep that you have to cram your eyeball into then your not going to view very long before you start rubbing your eyes from the strain. I have a Z10 and I use eyepiece magnification as well as eye relief, another tool of the hobby, 2 in. ep's are great if your using them to locate your target but, when I got my2 in. Z100 9mm w/ 16mm ER  the moon's details were even better , detail on Jupiter much more defined and the Cassini division was more distinct in the rings of Saturn . There's nothing to touch the edge to edge clarity of a TeleVue or a TV  Nagler  premium and sometimes you just have to break the bank for awesomeness IMHO. I use my Nagler zoom for examination of objects and the ER is comfortable, my 2 in. Z100's have 16mm ER and that makes viewing more pleasurable. As for a finder scope , I've got a RACI 8x50 that's great and I've got a Telrad reflex sight and use them both to help in my quest. You really need to do your homework and research ,research , research and decide what your wanting to start working on first Planets , OC, globs, nebulae, galaxies, double stars, asterism . Decide what you would like to tackle first then you can expand your collections of oculars. You'll need high med. and low power  and that's a good base you can  fill in your ranges as time moves on and you see what your lacking in your views.

Moderator
  • Member since
    July, 2001
  • From: PA, USA, Earth Moderator
Posted by DaveMitsky on Saturday, November 16, 2013 7:14 PM

The XT8 has a focal ratio of f/5.9 so you can go as long as a 2" 41 mm 68 to 70 degree apparent field of view widefield eyepiece (assuming that your pupil dilates to 7mm) without "wasting" aperture, i.e., "stopping down" your scope.  I always recommend having an eyepiece that will maximize true field of view.

If you get a 2" Barlow lens, you'll be able to use it with 1.25" and 2" eyepieces.

As mentioned, eye relief* can be an issue, especially at short focal lengths and for those who must wear eyeglasses while observing, so you may want to consider an eyepiece design with extended eye relief in the 6 to 8mm range.

http://starizona.com/acb/basics/equip_eyepieces_understanding.aspx

* Some long focal length eyepieces can have too much eye relief.

Dave Mitsky

Sic itur ad astra!

Chance favors the prepared mind.

A man is a small thing, and the night is very large and full of wonders.

Moderator
  • Member since
    July, 2001
  • From: PA, USA, Earth Moderator
Posted by DaveMitsky on Saturday, November 16, 2013 8:56 PM

You may want to consider adding a Telrad to your XT8.  A narrowband nebula filter is also worth having.

Dave Mitsky

Sic itur ad astra!

Chance favors the prepared mind.

A man is a small thing, and the night is very large and full of wonders.

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