Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
07-03-2014, 03:36 AM   #1
Veteran Member
chromo's Avatar

Join Date: Feb 2010
Location: North Coast NSW
Photos: Gallery | Albums
Posts: 581
Telescope adaptor

Just picked up a reflector telescope and would like to put the K-5 onto it.

What sort of adaptor do I need ?
The scope uses 1.25" eyepieces.

Also, do these adaptors have any glass in them ?
If not I could make my own using the mount from an old lens.

07-03-2014, 04:12 AM - 1 Like   #2
Loyal Site Supporter
Loyal Site Supporter




Join Date: Jun 2009
Location: Tumbleweed, Arizona
Photos: Gallery | Albums
Posts: 5,603
Morning,

They are called T adapters. There are a lot of them around. Here are some links....



07-03-2014, 04:28 AM   #3
Pentaxian




Join Date: Jun 2010
Location: North Zealand, Denmark
Photos: Gallery | Albums
Posts: 1,516
Maybe it is self-evident, but: The T-1.25" Adapter is universal, while the T2-ring must be "for Pentax-K" specific.

Do you plan to use your scope for astrophotography? If so, what mount did it come with?
07-03-2014, 04:48 AM   #4
Veteran Member
chromo's Avatar

Join Date: Feb 2010
Location: North Coast NSW
Photos: Gallery | Albums
Posts: 581
Original Poster
Ok thanks for that.
So let me get this straight. My telescope is a 5" 1000mm FL. I can fit different eyepieces like 20mm or 40mm to the telescope and change the magnification, but if I fit my camera to it I will have a set 1000mm lens ?

Is there a way to change the magnification when using my camera ?

---------- Post added 3rd Jul 2014 at 09:51 PM ----------

QuoteOriginally posted by Stone G. Quote
Maybe it is self-evident, but: The T-1.25" Adapter is universal, while the T2-ring must be "for Pentax-K" specific.

Do you plan to use your scope for astrophotography? If so, what mount did it come with?
Yes, and it's just a 1.25" tube on a focuser rack.

07-03-2014, 04:55 AM   #5
Moderator
Not a Number's Avatar

Join Date: Mar 2012
Location: Venice, CA
Posts: 8,794
Using the eyepiece projection setup allows you to change the magnification by changing the focal length of the eyepiece.

The following article will answer all your questions including how to calculate power, focal length etc.
Eyepiece Projection Vs Prime Focus | Astronomy Source
07-03-2014, 06:34 AM   #6
Veteran Member
chromo's Avatar

Join Date: Feb 2010
Location: North Coast NSW
Photos: Gallery | Albums
Posts: 581
Original Poster
QuoteOriginally posted by Not a Number Quote
Using the eyepiece projection setup allows you to change the magnification by changing the focal length of the eyepiece.

The following article will answer all your questions including how to calculate power, focal length etc.
Eyepiece Projection Vs Prime Focus | Astronomy Source
Ah I'm starting to get the idea now.
07-03-2014, 09:36 AM - 1 Like   #7
Pentaxian




Join Date: Jun 2010
Location: North Zealand, Denmark
Photos: Gallery | Albums
Posts: 1,516
QuoteOriginally posted by chromo Quote
Ah I'm starting to get the idea now.
There is an alternative to eyepiece projection, if you can 'live' with more modest magnifications. You can use ordinary teleconverters between T2-ring and camera, a so-called Barlow lens (a tele-negative lens much like a teleconverter) between scope and T2-ring, and even combinations of both:



Here you see the combination from camera and out: 2X Teleconverter + T2-ring with (hidden) 1.25" nosepiece +2.5X apochromatic Barlow. On my 4"/1000mm Newtonian that gives me an effetive focal length of some 5,800 mm. You may read a bit more and see some examples here:

Camera Settings for Astrophotography

Be prepared: Even such a relatively modest magnification requires a sturdy mount and a smooth focusing draw tube on your telescope - - - and some patience to get your target framed on the sensor!!!



Reply

Bookmarks
  • Submit Thread to Facebook Facebook
  • Submit Thread to Twitter Twitter
  • Submit Thread to Digg Digg
Tags - Make this thread easier to find by adding keywords to it!
adaptor, camera, change, magnification, telescope, tripod
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
Q with K adaptor... then attach 645 adaptor??!!! Unsinkable II Pentax Q 10 11-04-2017 03:01 AM
Old Pentax Telescope guadua Troubleshooting and Beginner Help 7 04-03-2014 07:13 PM
plastic telescope vs dslr ripit General Talk 6 05-20-2013 10:04 AM
Telescope with K Mount RockvilleBob Pentax SLR Lens Discussion 3 05-20-2013 08:20 AM



All times are GMT -7. The time now is 06:31 AM. | See also: NikonForums.com, CanonForums.com part of our network of photo forums!
  • Red (Default)
  • Green
  • Gray
  • Dark
  • Dark Yellow
  • Dark Blue
  • Old Red
  • Old Green
  • Old Gray
  • Dial-Up Style
Hello! It's great to see you back on the forum! Have you considered joining the community?
register
Creating a FREE ACCOUNT takes under a minute, removes ads, and lets you post! [Dismiss]
Top