Results 1 to 2 of 2
  1. #1
    josmith16's Avatar
    josmith16 is offline Main Sequence
    Points: 5,496, Level: 50
    Level completed: 73%, Points required for next Level: 54
    Overall activity: 0%
    Achievements:
    50 Posts Achievement!5 Threads Achievement!365 Days+ Registered Achievement!First 1000 Experience Points2 Posts Achievement
    Join Date
    Jul 2011
    Location
    Bartlett, TN, USA
    Posts
    192
    Points
    5,496
    Level
    50
    Thanks
    21
    Thanked 51x 30 Posts

    Default Focal Reducer for Mak-Cass questions...



    I own a 127mm Mak-Cass, which has a focal length of 1540mm, and might consider in the future possibly getting a 180mm Mak-Cass, which has a focal length of 2700mm. I have read a few articles about that fact that because the Mak-Cass has a long focal length that it is not ideal for DSO viewing because of the small TFOV. I saw some people have bought an SCT adapter and a focal reducer for the Mak-Cass. I'm curious if there are any focal reducers,which are made to adapt to the Mak-Cass without a adapter, and I'm assuming that I can add a focal reducer to the end of my EP and not have to use it with a camera. Is ther a focal reducer that just screws on the my eyepiece? Suggestion or comments concerning the focal reducer and adapter would be appreciated. And if anyone can explain any disadvantages to using a focal reducer, I would appreciate that too.

  2. #2
    Maverick199's Avatar
    Maverick199 is offline HYPER GIANT
    Points: 10,570, Level: 71
    Level completed: 7%, Points required for next Level: 280
    Overall activity: 0%
    Achievements:
    365 Days+ Registered Achievement!First 1000 Experience Points200+ Posts Achievement!400+ Posts Achievement5 Threads Achievement!
    Join Date
    Apr 2011
    Location
    India
    Posts
    1,621
    Points
    10,570
    Level
    71
    Thanks
    212
    Thanked 538x 414 Posts

    Default

    Normally a Focal reducer attaches or threads onto the visual back of your OTA. Focal reducers can come in two varieties.

    1. Focal reducer 0.63x which threads onto the Visual back of your scope.
    2. Focal reducer 0.50x whcih threads INTO your eyepiece barrel, like GSO for example.

    Based on their number, your scopes focal ratio will decrease, thus enabling you to cover a wider field of view.

    However, your 127mm Mak Cass's FoV should be adequate enough to view DSO's, except Double Clusters of Pleiades for example where your ratio wouldn't cover the field.
    Z8.
    Telrad.
    "So many questions, so much to learn, so little time".

 

 

Similar Threads

  1. Focal Reducer - 2 Questions
    By gardensatty in forum Astronomy Beginners Forum
    Replies: 10
    Last Post: 11-27-2011, 12:34 AM
  2. What a focal reducer does?
    By lhudson in forum Reflector Telescope Forum
    Replies: 3
    Last Post: 02-09-2011, 01:31 AM
  3. Using a focal reducer
    By jb32828 in forum Telescope Accessories Forum
    Replies: 3
    Last Post: 12-03-2010, 09:56 PM
  4. Do I need a focal reducer?
    By sky watcher in forum Telescope Accessories Forum
    Replies: 4
    Last Post: 05-28-2009, 01:10 PM
  5. Orion 127mm Mak - Cass and a focal reducer?
    By David Nakamoto in forum Amateur Astronomy Forum
    Replies: 0
    Last Post: 04-14-2005, 09:12 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
Powered by vBulletin® Version 4.2.0
Powered by vBulletin®
All times are GMT. The time now is 06:21 PM.