Author Topic: 2" Eyepieces - Advice Needed!  (Read 1423 times)

Andy

  • CSOG'er
  • Sr. Member
  • ***
  • Posts: 270
  • Karma: +5/-0
2" Eyepieces - Advice Needed!
« on: April 07, 2015, 08:18:16 AM »
Hi guys - I recently purchased  my first 2" 26ml eyepiece to upgrade my collection. I have been looking forward to viewing globular clusters with it. I have a 6" F5 Skywatcher Reflctor. I seem to have a problem bringing anything to focus with the ep though. Had Jupiter in all my other 1.25 ep's sharp and clear but didn't seem to have enough room to bring it into focus with the 2".
My question is - Is there something I can purchase which would give me enough room to bring the 2" ep to focus or is there something obvious I'm missing?? Done a wee bit googling but can't seem to find an answer so I thought I would put it to you guys............as always - any help appreciated


Andy
300mm Skywatcher Truss Dobsonian
80mm Celestron wide field refractor
Telrad and 9X50 RACI finder
Meade 5000 32mm/Q70 38mm/Skwatcher Nirvana 82 degree 28mm, 16mm, 7mm/Explore Scientific 100 degree 20mm/ Vixen LV 9mm /Televue Delos 4.5mm/ Televue Radian12mm and x2 Astro Revelation Barlow
Nikon D5000

Lorne

  • CSOG'er
  • Hero Member
  • ***
  • Posts: 1334
  • Karma: +15/-1
Re: 2" Eyepieces - Advice Needed!
« Reply #1 on: April 07, 2015, 09:26:51 AM »
Try getting focus by pulling the 2" eyepiece slightly out of the holder and tightening in place. If it works you will need a 2" extension tube, these come in 35mm, 50mm and 70mm long, usually the 35mm is OK.


On the other hand, if its inward travel your focuser requires, its not so easy - possibly a low profile focuser required!




 

« Last Edit: April 07, 2015, 09:29:22 AM by Lorne »

iam4208

  • Hero Member
  • *****
  • Posts: 809
  • Karma: +10/-1
Re: 2" Eyepieces - Advice Needed!
« Reply #2 on: April 07, 2015, 05:57:49 PM »
I had a similar problem on my 10" dob with smaller focal length EPs (8mm and 13mm) and did what Lorne has suggested to successfully focus.  This alllows me great views of Jupiter and the Moon.  I'm surprised you're having a similar problem with a longer EP, but I hope the trick works for you too.
Sky-Watcher Skyliner-250PX FlexTube Parabolic Truss-Tube Dobsonian with Baader Hyperion 36, 21, 13 and 8mm EPs and a 2x Barlow.
Telrad and RACI finder scope for finding objects the good ol' fashioned way:-)

Andy

  • CSOG'er
  • Sr. Member
  • ***
  • Posts: 270
  • Karma: +5/-0
Re: 2" Eyepieces - Advice Needed!
« Reply #3 on: April 07, 2015, 06:10:58 PM »
Cheers guys -I will give that a try and see how I get on. It's a bit of a monster the 2" and I don't think the short focal length of my scope is helping. Now for some clear skies eh?


Andy
300mm Skywatcher Truss Dobsonian
80mm Celestron wide field refractor
Telrad and 9X50 RACI finder
Meade 5000 32mm/Q70 38mm/Skwatcher Nirvana 82 degree 28mm, 16mm, 7mm/Explore Scientific 100 degree 20mm/ Vixen LV 9mm /Televue Delos 4.5mm/ Televue Radian12mm and x2 Astro Revelation Barlow
Nikon D5000

dtr42

  • CSOG'er
  • Hero Member
  • ***
  • Posts: 563
  • Karma: +4/-0
Re: 2" Eyepieces - Advice Needed!
« Reply #4 on: April 07, 2015, 08:09:14 PM »
Andy is that you on the facebook forum asking the same question?

Andy

  • CSOG'er
  • Sr. Member
  • ***
  • Posts: 270
  • Karma: +5/-0
Re: 2" Eyepieces - Advice Needed!
« Reply #5 on: April 08, 2015, 01:30:27 AM »
Aye it sure was - Thought I should cast my net as wide as possible ha ha
300mm Skywatcher Truss Dobsonian
80mm Celestron wide field refractor
Telrad and 9X50 RACI finder
Meade 5000 32mm/Q70 38mm/Skwatcher Nirvana 82 degree 28mm, 16mm, 7mm/Explore Scientific 100 degree 20mm/ Vixen LV 9mm /Televue Delos 4.5mm/ Televue Radian12mm and x2 Astro Revelation Barlow
Nikon D5000