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FORUMS Photo Sharing & Visual Enjoyment Astronomy & Celestial 
Thread started 23 Nov 2011 (Wednesday) 21:43
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D90 and ETX-90

 
Ryan7490
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Nov 23, 2011 21:43 |  #1

Hello,

I want to mount my Nikon D90 onto my Meade ETX-90 telescope.

From what I've been reading, I need a T-mount like this:

http://www.bhphotovide​o.com …t_SLR_Camera_Ad​apter.html (external link)


So that connects the camera to the back of the telescope. Is there anything else I need? Thanks.

Edit: so it looks like I'll also need this.

http://www.bhphotovide​o.com …3_SLR_Camera_Ad​apter.html (external link)

And then I'm think I"m good to go.


Nikon D610, 50 f/1.8, 70-300 VRII


 (external link)

  
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Toxic ­ Coolaid
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Nov 24, 2011 00:54 |  #2

You will also need the t tube as well. Here is a link that has the ring, t-mount, and a focal reducer.

http://www.telescopes.​com …lrcameraattachm​entkit.cfm (external link)

You don't have to have the reducer, but it will give you the option for a wider field of view and shorter exposure times which will help. The t-mount hast to be threaded so it will match the Meade threads. I assume the etx-90 has the same as my LX90. I had a ETX a long time ago but I can't comfirm it's the same. You will need a trigger timer to work the shutter too. I use a $20 one from Trust Digital I found on Amazon. If the threads are not the same, they also make a t-ring that attaches to your camera and the other end fits in the 1.25 in just like your eyepieces. I usually get stuff from Telescopes.com. It's best to have a polar wedge to take pictures too. It's like a big can of worms... TRUST ME! Hope this helps. Any more questions I'll check back, or you can send me a PM




  
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Ryan7490
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Nov 24, 2011 15:25 |  #3

Thanks for the reply. It looks like I'll need the 'Meade ETX Back Cell Adapter' if I want to use the reducer with my etx-90. And I have the remote shutter and a meade tripod, looks like this. I it has the polar wedge.

IMAGE: http://www.harrisontelescopes.co.uk/acatalog/07027.jpg



Is this the t-tube you are talking about? In the link the Tube was #62 but for the ETX-90 I need tube #64
IMAGE: http://static.bhphotovideo.com/images/images200x200/202501.jpg


And I also need the T-mount
IMAGE: http://www.bhphotovideo.com/images/images150x150/252747.jpg


and lastly the f/6.3 reducer
IMAGE: http://www.bhphotovideo.com/images/images150x150/202595.jpg

Nikon D610, 50 f/1.8, 70-300 VRII


 (external link)

  
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Toxic ­ Coolaid
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Nov 25, 2011 09:00 |  #4

That looks to be what you will need. You should be able to get some nice images with that.




  
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Ryan7490
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Nov 25, 2011 23:48 |  #5

Great! Thanks a lot!


Nikon D610, 50 f/1.8, 70-300 VRII


 (external link)

  
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Ryan7490
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Dec 03, 2011 01:58 |  #6

Ok so I got all my stuff. But my telescope doesnt seem to be tracking too well. Its equatorial mount. I set it up as the directions say. But I'm still getting star trails. Any 'insider' tips? Could the weight of the camera on the back be throwing off the motor?


Nikon D610, 50 f/1.8, 70-300 VRII


 (external link)

  
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archer1960
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Dec 03, 2011 13:16 |  #7

You do need to be sure the load is balanced, but the more likely problem is polar alignment. How long are the shots you're trying to take, and what is the focal length? The longer the shot and the longer the f/l, the tighter your polar alignment needs to be. And even with the best alignment, longer than a couple of minutes is very difficult without active guiding.


Gripped 7D, gripped, full-spectrum modfied T1i (500D), SX50HS, A2E film body, Tamzooka (150-600), Tamron 90mm/2.8 VC (ver 2), Tamron 18-270 VC, Canon FD 100 f/4.0 macro, Canon 24-105 f/4L,Canon EF 200 f/2.8LII, Canon 85 f/1.8, Tamron Adaptall 2 90mmf/2.5 Macro, Tokina 11-16, Canon EX-430 flash, Vivitar DF-383 flash, Astro-Tech AT6RC and Celestron NexStar 102 GT telescopes, various other semi-crappy manual lenses and stuff.

  
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D90 and ETX-90
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