Photography Tips Online HomepageBeginning Photography Tips
Forum Home Forum Home | Photo Galleries | Astrophotography
  New Posts New Posts RSS Feed: Using a telescope and skytracker
  FAQ FAQ  Forum Search   Calendar   Register Register  Login Login

Using a telescope and skytracker

 Post Reply Post Reply
Author
Message
JT View Drop Down
Senior Member
Senior Member
Avatar

Joined: 21 Mar 2013
Location: Innsbruck
Posts: 814
Post Options Post Options   Quote JT Quote  Post ReplyReply Direct Link To This Post Topic: Using a telescope and skytracker
    Posted: 19 Apr 2016 at 9:55am
Hi Dave & others.

next week I will have the opportunity to use a telescope that is attached to a tracker which will allow me to take longer exposures.

Q: What Kind of Setting will be a good start - don't want to waste half the night with Trial and error to get to a decent exposure.

Q: should I connect the telescope directly to the camera or via lense like a 50mm.

Q: When taking shots of Star Cluster - what WB do you use? 3300K?

Telescope: 180/2700 Skywatcher Cassegrain on HEQ-5 Pro GoTo
Camera - Canon 7D or Sony a7r depending on Adapter and/or lens

thx
JT

Edited by JT - 19 Apr 2016 at 9:55am
Back to Top
davenn View Drop Down
Senior Member
Senior Member
Avatar

Joined: 25 Nov 2011
Location: Sydney, Oz
Posts: 879
Post Options Post Options   Quote davenn Quote  Post ReplyReply Direct Link To This Post Posted: 04 May 2016 at 6:43am
Originally posted by JT

Hi Dave & others.

next week I will have the opportunity to use a telescope that is attached to a tracker which will allow me to take longer exposures.


Hi Johann

sorry for not answering on time, I was already in Africa by the time
you posted and for the first week 18 - 23 and didn't have much internet access from Uganda

I wonder how you got on ?

The "MAK's" are not great for deep space photography because of their high f ratio ... f15 in the case of that scope .... horribly slow

you would have been better off mounting the camera and say a 400mm telephoto directly to the mount and doing imaging that way

the mount is a very good one .... I also own a HEQ5 PRO GOTO

I usually use AWB and do any adjustments in Lightroom etc in pp


cheers
Dave

Edited by davenn - 04 May 2016 at 6:45am
Canon 5D3, 6D, 700D a bunch of lenses and other bits, ohhh and some Pentax stuff
Back to Top
JT View Drop Down
Senior Member
Senior Member
Avatar

Joined: 21 Mar 2013
Location: Innsbruck
Posts: 814
Post Options Post Options   Quote JT Quote  Post ReplyReply Direct Link To This Post Posted: 04 May 2016 at 7:07am
Hi Dave, we did not get around to it yet, it has been cloudy/raining for the last 2 weeks.
Thanks for the tip on using the stand with my 400mm. I even have a 2x extender so could get an 800mm at F11 on my fullframe.

Am away this Weekend (Slovenia vs Austria Rugby match) but next week could be a good time to try it out.

regards
JT
Back to Top
davenn View Drop Down
Senior Member
Senior Member
Avatar

Joined: 25 Nov 2011
Location: Sydney, Oz
Posts: 879
Post Options Post Options   Quote davenn Quote  Post ReplyReply Direct Link To This Post Posted: 04 May 2016 at 7:57am
Originally posted by JT

Hi Dave, we did not get around to it yet, it has been cloudy/raining for the last 2 weeks.
Thanks for the tip on using the stand with my 400mm. I even have a 2x extender so could get an 800mm at F11 on my fullframe.

Am away this Weekend (Slovenia vs Austria Rugby match) but next week could be a good time to try it out.

regards
JT


ahhhh no probs, again, f11 is getting into that slow range.
I make a point of not going anything over f6
my preference would be the Canon 400mm f2.8, but at more than
AU $12,000 it's not going to happen any time soon
unless Im using my Samyang 14mm for wide angle Milky Way shots
I'm usually using the 70-200mm f2.8 @ 200mm or the 100 - 400mm @ 400mm and f5.6
As you up your f ratio, you need to do longer and longer exposures to compensate, this means that polar alignment inaccuracies of the mount become more prominent

Dave
Canon 5D3, 6D, 700D a bunch of lenses and other bits, ohhh and some Pentax stuff
Back to Top
JT View Drop Down
Senior Member
Senior Member
Avatar

Joined: 21 Mar 2013
Location: Innsbruck
Posts: 814
Post Options Post Options   Quote JT Quote  Post ReplyReply Direct Link To This Post Posted: 04 May 2016 at 9:36pm
Hi Dave, a friend of mine has a Swarovski scope (the big one) - what kind of F stop will that have? Maybe I can borrow a 400mm F4 which will give me 800mm at F8...
Back to Top
JT View Drop Down
Senior Member
Senior Member
Avatar

Joined: 21 Mar 2013
Location: Innsbruck
Posts: 814
Post Options Post Options   Quote JT Quote  Post ReplyReply Direct Link To This Post Posted: 04 May 2016 at 10:13pm
PS: I did some digging - the scope depends on how far you zoom: for example:
30x / 1350mm / f/9.5
to
70x / 3150mm / f/22
I have used it for digiscoping before and it is a wonderful piece of kit.
Back to Top
davenn View Drop Down
Senior Member
Senior Member
Avatar

Joined: 25 Nov 2011
Location: Sydney, Oz
Posts: 879
Post Options Post Options   Quote davenn Quote  Post ReplyReply Direct Link To This Post Posted: 05 May 2016 at 3:23am
Originally posted by JT

Hi Dave, a friend of mine has a Swarovski scope (the big one) - what kind of F stop will that have?


Swarovski seem to specialise in rifle and spotting scopes

here are versions of their spotting scopes available in Australia

http://www.bintel.com.au/Spotting-Scopes/Swarovski/149/catmenu.aspx

not really practical for astronomy and particularly not for astro-imaging

Maybe I can borrow a 400mm F4 which will give me 800mm at F8...


400mm @ f4 would be awesome, it will get you good images of many deep sky objects plus the moon and the sun as well with an appropriate solar filter
Adding the 2x teleconverter to get to 800mm would be good to start playing with the planets particularly Jupiter and Saturn



Dave

Edited by davenn - 05 May 2016 at 3:29am
Canon 5D3, 6D, 700D a bunch of lenses and other bits, ohhh and some Pentax stuff
Back to Top
 Post Reply Post Reply

Forum Jump Forum Permissions View Drop Down



This page was generated in 0.141 seconds.

FREE Photography Course: Start learning photography today with Karl Taylor's Free Photography Course.

Complete your photography knowledge with Karl Taylor Photography Courses.