#21  
Old 02-01-2017, 12:22 PM
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Shiraz (Ray)
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Originally Posted by alpal View Post
Looks like it's not worth buying until Skywatcher fixes up those problems
or a kit is available to modify it.


cheers
Allan
doubt that Skywatcher will do anything Allan - the EQ8s seem to be selling well as they are and buyers are generally satisfied as far as I can tell.

Alternatives would have to include the G11 with a high spec worm (half the capacity) or one of the Europeans (double the price).
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  #22  
Old 02-01-2017, 01:06 PM
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Does anybody have a mechanical drawings with dimensions of the pier/tripod adapter plate?
I intend to get the mount only, pier will be concrete and/or steel in my own arrangement.
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  #23  
Old 02-01-2017, 01:19 PM
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Here it is
Attached Thumbnails
Click for full-size image (Dimensions.JPG)
97.6 KB40 views
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  #24  
Old 02-01-2017, 01:34 PM
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Here it is
Thank you!
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  #25  
Old 02-01-2017, 03:03 PM
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doubt that Skywatcher will do anything Allan - the EQ8s seem to be selling well as they are and buyers are generally satisfied as far as I can tell.

Alternatives would have to include the G11 with a high spec worm (half the capacity) or one of the Europeans (double the price).
Yes Ray,
you have a point.
The one I like the most is the DDM 85 -
which I've seen with my own eyes - example here:
https://www.youtube.com/watch?v=0Yhsiv2A_Po

but at nearly $25K delivered - it's for the wealthy only:
http://www.astroshop.eu/equatorial-w...-basic/p,33389

cheers
Allan
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  #26  
Old 02-01-2017, 04:11 PM
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I don't think there is much point spending tens of thousands on a mount if your optics and camera are only worth a couple of thousand. If I had unlimited money to spend then I'd go for it and upgrade the mount, scope, focuser and camera. Having said that, I still live in a highly light polluted suburb with extremely limited horizons so if I didn't enjoy tinkering with the gear I'd be better off hiring time on a remote scope (or just purchase Hubble images).
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  #27  
Old 03-01-2017, 08:04 AM
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Originally Posted by peter_4059 View Post
I don't think there is much point spending tens of thousands on a mount if your optics and camera are only worth a couple of thousand. If I had unlimited money to spend then I'd go for it and upgrade the mount, scope, focuser and camera. Having said that, I still live in a highly light polluted suburb with extremely limited horizons so if I didn't enjoy tinkering with the gear I'd be better off hiring time on a remote scope (or just purchase Hubble images).

Thanks Peter,
I quite agree.
Melbourne is not a very good place for a telescope either.
Also - there is a certain amount of pride to be had from getting great results
from equipment which is not the most expensive available.
I prefer to work on a low budget.
This is where the EQ8 becomes almost irresistible as nothing
else can handle such a heavy 50Kg payload for that price.
It means that you can get the light collecting power of a large telescope
& collect data faster.
You could even put 2 or more 10" f4 telescopes like mine on one mount
& get data from 2 or more cameras at the same time.

cheers
Allan
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  #28  
Old 03-01-2017, 08:43 AM
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Thanks Peter,
I quite agree.
Melbourne is not a very good place for a telescope either.
Also - there is a certain amount of pride to be had from getting great results
from equipment which is not the most expensive available.
I prefer to work on a low budget.
This is where the EQ8 becomes almost irresistible as nothing
else can handle such a heavy 50Kg payload for that price.
It means that you can get the light collecting power of a large telescope
& collect data faster.
You could even put 2 or more 10" f4 telescopes like mine on one mount
& get data from 2 or more cameras at the same time.

cheers
Allan
Sounds like we have a similar philosophy (and constraints) although one 10" f4 is enough for me.
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  #29  
Old 03-01-2017, 09:02 AM
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I also agree.
At first I was considering EQ6 as sufficient for my 10" F/5.6 Newt (mine is fully internal belt-modified, with OnStep controller), but that OTA (fiberglass) weights ~13kg... this is sort of within the claimed capacity of EQ6, but too close to upper limit to my taste (and I believe all those claims should be divided by at least 2 to avoid overloading).
I even made SerrurierTruss from rectangular 25mm Al tubing, but saved only ~1.5kg.. so I decided to abandon this approach, and go for bigger mount.
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  #30  
Old 03-01-2017, 09:34 AM
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I also agree.
At first I was considering EQ6 as sufficient for my 10" F/5.6 Newt (mine is fully internal belt-modified, with OnStep controller), but that OTA (fiberglass) weights ~13kg... this is sort of within the claimed capacity of EQ6, but too close to upper limit to my taste (and I believe all those claims should be divided by at least 2 to avoid overloading).
I even made SerrurierTruss from rectangular 25mm Al tubing, but saved only ~1.5kg.. so I decided to abandon this approach, and go for bigger mount.
All I've managed to do is add weight to mine!
- Replaced original Meade rings with Parallax
- Replaced original Vixen dovetails with Losmandy
- Added a doubling plate behind the focuser to avoid flex
- Replaced QHY8 with QSI683ws8

I originally planned to replace the mirror cell with something more sturdy to help hold collimation however tighter springs seems to have worked ok with the original cell.

I had also contemplated Moonlite's new Nitecrawler rotating focuser but it is quite heavy so haven't progressed that plan (yet).

Guess I like tinkering!
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Old 03-01-2017, 09:40 AM
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.... Guess I like tinkering!
Sometimes I think the tinkering is the sole purpose of my life
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  #32  
Old 03-01-2017, 09:44 AM
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Sometimes I think the tinkering is the sole purpose of my life
Engineer?
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  #33  
Old 03-01-2017, 10:18 AM
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yes...
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  #34  
Old 04-01-2017, 08:24 AM
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I also agree.
At first I was considering EQ6 as sufficient for my 10" F/5.6 Newt (mine is fully internal belt-modified, with OnStep controller), but that OTA (fiberglass) weights ~13kg... this is sort of within the claimed capacity of EQ6, but too close to upper limit to my taste (and I believe all those claims should be divided by at least 2 to avoid overloading).
I even made SerrurierTruss from rectangular 25mm Al tubing, but saved only ~1.5kg.. so I decided to abandon this approach, and go for bigger mount.
Hi Bojan,
My scope weighs about the same & works fine with a modified EQ6.
Did you try a better counter weight shaft with your EQ6 as I did below?:
02-01-2017, 09:29 AM
https://www.flickr.com/photos/247194...in/photostream

cheers
Allan
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Old 04-01-2017, 10:08 AM
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Hi Bojan,
My scope weighs about the same & works fine with a modified EQ6.
Did you try a better counter weight shaft with your EQ6 as I did below?:
02-01-2017, 09:29 AM
https://www.flickr.com/photos/247194...in/photostream

cheers
Allan
Hi Alan,
I have thicker shaft for counterweight (30mm I think), this is not the problem..
When I put the whole thing together, I simply didn't have the feeling the mount is strong&sturdy enough, there was noticeable and slow swinging of the whole thing (on tripod.. situation may be better on pier, I have yet to try that)), that made me quite uncomfortable.
Also, for EQ6 "official" useful payload capacity is 25kg (~50kg with counterweight), and I consider this as absolute, short term maximum... 18kg is too close to that limit IMO.
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Old 05-01-2017, 07:46 AM
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Hi Alan,
I have thicker shaft for counterweight (30mm I think), this is not the problem..
When I put the whole thing together, I simply didn't have the feeling the mount is strong&sturdy enough, there was noticeable and slow swinging of the whole thing (on tripod.. situation may be better on pier, I have yet to try that)), that made me quite uncomfortable.
Also, for EQ6 "official" useful payload capacity is 25kg (~50kg with counterweight), and I consider this as absolute, short term maximum... 18kg is too close to that limit IMO.

Hi Bojan,
OK - I thought your actual OTA with camera weight is about 13 Kg like mine?
13 Kg is fine for imaging with an EQ6 especially with a proper counterweight shaft screwed into the holder.
Also my 10" f4 is quite short so there is less bending moment than
a longer telescope like yours.

(Just for the benefit of others.
If you have an unmodified EQ6 - take off the counterweights &
use your hand to put force side ways & back on the counter weight shaft -
you'll see that it's really wobbly.
The easy modification linked below, fixes it & makes a huge difference)

cheers
Allan
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  #37  
Old 05-01-2017, 11:58 AM
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Another mount that I have heard good things about is the Mesu200. It isn't cheap but it isn't overly expensive either considering it's 80-100kg capacity.
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  #38  
Old 05-01-2017, 12:08 PM
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.....The easy modification linked below, fixes it & makes a huge difference)...
Allan
Missing link
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  #39  
Old 05-01-2017, 12:15 PM
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Missing link
I had already showed the link twice on this thread but here it is again:
https://www.flickr.com/photos/247194...in/photostream
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  #40  
Old 05-01-2017, 12:22 PM
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Another mount that I have heard good things about is the Mesu200. It isn't cheap but it isn't overly expensive either considering it's 80-100kg capacity.
Looks interesting:
http://www.modernastronomy.com/shop/...esu-mount-200/
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