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Is it worth it - DSLR to CGEM DX Mount?

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#1 hytham

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Posted 27 December 2012 - 01:14 PM

This would seem to be an easy thing to answer, but having such a hard time coming to a conclusion and would like some input from all of you to push me in the right direction :)

I'm in the market to purchase a FSQ 106EDXIII for some wide field astrophotography (assuming this weather ever clears up), but one other burning question I have is: Is it worth also purchasing all the necessary adapters to connect my DSLR and 9x50 autoguiding to my CGEM DX mount? I'd rather not piggy back to my telescope to minimize the amount of equipment that I would drag along.

So... do I simply go with the FSQ-106EDXIII, and stitch together mosaics saving myself the cash of the ADM adapters ($510) and the Canon Lens (~$1000)? Or do I invest in the Canon set up as well to have the extremely wide field and minimize the time necessary for a wide field result? I do see myself eventually attaching the Canon Lenses to a CCD for LRGB and/or narrowband work.

Some math:

t3i pixel 4.3 microns
t3i cmos array 5184 x 3456
takahashi 530mm FL (native)
takahashi resolving 1.09 arc seconds
canon 2.8L 135mm FL

Canon T3i with 135mm FL Lens:
6.57 asec/pixel
567.65 x 378.43 (arcmin) = 9.46 x 6.31 (degrees)

Takahashi FSQ-EDXIII with T3i
1.67 asec/pixel
144.29 x 96.19 (arcmin) = 2.40 x 1.60 (degrees)

Thank you for the thoughts!

-Hytham

#2 Footbag

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Posted 27 December 2012 - 02:42 PM

I'm not sure what you are asking. How would you take the individual mosaic frames without auto-guiding? Or are you asking if you can go without auto-guiding?

You are talking about a $5k scope. Spend the $500 on a proper guiding setup and get the most out of it.

I'm not sure where you are going with the DSLR lens. Personally, I'd hold off on that. Get your Tak under the stars and use it.

#3 hytham

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Posted 27 December 2012 - 04:08 PM

Sorry. I was wondering whether or not in addition to purchasing a Tak, whether the investment into additional accessories to attach a DSLR directly on to the CGEM DX mount is a worthwhile investment.

I'm wondering if I'm simply throwing money away at this point by purchasing both a Tak and equipping my DSLR for wide field work.

#4 Footbag

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Posted 27 December 2012 - 04:36 PM

I'd get the Tak going first. Eventually, you will get the bug for some more optics, but for now use what you have.

That said, it seems like you should be able to attach the DSLR for less then $500. You could piggyback it with rings for $169. Without rings for $25, but I'm not sure if the tripod mount can hold the 135mm lens. I wouldn't expect a dovetail mount to be much more then $150.

#5 Hikari

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Posted 27 December 2012 - 04:46 PM

I think you answered your own question. You seem hesitant in purchasing the other stuff. Save your money for when you do know what you want to do with it.

#6 hytham

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Posted 27 December 2012 - 05:03 PM

I think you answered your own question. You seem hesitant in purchasing the other stuff. Save your money for when you do know what you want to do with it.


My thoughts to have the DSLR set up is to have a quick grab and go especially in the winters of Minnesota. Quick set up, and quick tear down was the goal, but with the Tak, I *think* I could pull that off with a DSLR mounted to it (in the beginning ... CCD later).


With AP the learning curve is so large that I should be taking my time, but the excitement to grow quickly and have multiple set ups is really appealing.

#7 Hikari

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Posted 27 December 2012 - 05:23 PM

I find that the "grab and go" is never that easy. It seems like a great idea, but if you don't have the time for an astrophotography session, then an "quick" setup does not actually matter.

Besides, if you really want a quick wide-field portable mount--GEMS are a pain to carry--you may want to get an AstroTrac, Vixen Polarie, or maybe the new iOptron Skytracker for that type of thing.

#8 Hikari

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Posted 27 December 2012 - 05:26 PM

One other thought. I see folks entering photography and they get caught up buying the stuff. They can end up with a lot of gear that is never used because their photographic interests simply never went in that direction. It seem you have a great place to start. I would get a little experience under your belt so you can evaluate the next move.

#9 hytham

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Posted 27 December 2012 - 07:08 PM

You bring up some great points that were nothing more than a fleeting thought, but that was me trying to suppress the logical/objective adult side of my mind and try to run with the kid in a candy store, emotional reactive decision making instead.

You guys are both right. I need to settle down and focus and then later I can always evolve into another aspect of the hobby. I am definitely sure about astrophotography as it has been an interest since I was a kid and now that I'm financially capable, I want it all and NOW :)

Looks like the Tak with a modified DSLR to start and then move into CCD with LRGB and narrowband.

More thoughts always welcome and thank you!

#10 snowcrow

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Posted 27 December 2012 - 09:29 PM

Heres a grab-n-go setup for a camera.

http://www.telescope.../Orion-Adven...

#11 nofxrx

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Posted 27 December 2012 - 10:48 PM

What about just getting the FSQ106, the reducer for it(which turns it into an F/3.6, 385mm scope!), and you have two scopes in one.
Better yet, also get the 1.6x extender for it, and you have THREE scopes(or focal lengths) in one.. :)

That is MY ideal setup. Simple GEM. BRILLIANT FSQ106 and ATLEAST the reducer for the extra wide stuff.
The FSQ can handle MASSIVE sensors. even with the reducer it will handle 44mm(diagonal) sensors!

First and foremost...get the Tak. get the mount.
attach the DSLR and start having fun learning how to do the basics(polar alignments, guiding, etc)..
After that, my first investment would be modifying the camera..but my opinion may be a bit biased ;)

Good luck!

#12 hytham

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Posted 28 December 2012 - 02:53 AM

I also considered the reducer and was very surprised by its cost because it is 4.5x more expensive than the extender. I was not expecting that sort of difference.

I have taken pictures of two DSOs and of course they are the classic; Orion/Running Man and Andromeda with the Hyperstar3. I love the Hyperstar3, but I live in a red zone and I have always had a love for narrowband imaging :)

Brent, I'm sure I'll be bothering you about my mod(s) to my DSLRs. Looking at doing them myself and will need to order a few things.

#13 CounterWeight

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Posted 28 December 2012 - 02:32 PM

Just wanted to say starting with a relatively 'fast', flat wide field scope is a great idea - that tak scope a great choice if you have the means.

If your weather is anything like mine (working on 100 cloudy nights in a row :( and 4th wettest year on record) dont buy anything faster than you can fully use/test and or evaluate. Pick ONE setup and make it work to it's best. It's possible, esp going with NB and the very long exposure times, you may find the "needed" gear different than you can anticipate now. The one thing that can save a lot of time and money is something you cannot buy, and that is patience. Not claiming I've any good way to go about being patient, and in my case- only more difficult after I started getting images. But it's getting images fully done (captured and processed to final version), repeatably, that will be the best teacher about what if anything needs to be next.

#14 nofxrx

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Posted 31 December 2012 - 03:15 AM

I also considered the reducer and was very surprised by its cost because it is 4.5x more expensive than the extender. I was not expecting that sort of difference.

Yea, those prices are quite ridiculous..
I would start with 'just' the FSQ for now, and maybe add the extender down the road, and then MAYBE the reducer way down the road.. :shrug:
I think the FSQ is fine by itself/as-is..so just get it and start producing brilliant images! :D


Brent, I'm sure I'll be bothering you about my mod(s) to my DSLRs. Looking at doing them myself and will need to order a few things.


Not a problem!! Always willing to help, even if that help is answering questions, helping others with their own mods, etc, etc...I do this because I love it. :grin:
You can try to PM me here, but I do not get on here every day, so strongly appreciate emails instead...I check emails all day, every day!
DSLR_HyperCams@yahoo.com

Cheers!






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