#21  
Old 20-02-2010, 09:19 PM
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Bassnut (Fred)
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yeah, oh gaud, whats with the 99% all of a sudden, your kidding man .

Your about to leap into the good gear, with no woozy, time consuming inbetween money wasters. You have the skill. GET IT
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  #22  
Old 20-02-2010, 09:37 PM
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!

Quote:
Originally Posted by strongmanmike View Post
The internal guide chip in the SBIG's is almost a waste of time with your system,....
Yes, perhaps having the option of guiding adaptively at 15hz is a waste of time..... Not!
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  #23  
Old 20-02-2010, 09:46 PM
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Bassnut (Fred)
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Here we go, usual Peter/Mike biffo. NB internal guiding (unless you can take 30sec exposures with eg PME), forget it, Lum, great, external guide cam/OAG, fantastic.
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  #24  
Old 20-02-2010, 09:54 PM
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Quote:
Originally Posted by Bassnut View Post
Here we go, usual Peter/Mike biffo. NB internal guiding (unless you can take 30sec exposures with eg PME), forget it, Lum, great, external guide cam/OAG, fantastic.
No biffo Fred, promise.

The self guide chip is effectively both internal and external (with a remote guide head) ...hence the best of both worlds is very easy to implement....and even better , you can use an AO with a MOAG ahead of the filter set.... AO guided Narrow band....hummmm....
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  #25  
Old 20-02-2010, 10:02 PM
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bokglob (Darrell)
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Go for it H,it's an inevitable eventuality anyway If you've got half a chance to"evolve" imaging-wise,grab it. You only live once!(I think). PS I'm treating your leap of faith as inspiration All the best to you. Darrell
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  #26  
Old 20-02-2010, 10:06 PM
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Bassnut (Fred)
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I know, ive done it (MOAG OAG AO), works a treat. Point was, I dont think H is ready for the MOAG/AOL trip quite yet, although its nice to have that option in the future. For him the internal guide at this stage might be usefull for lum maybe.......... The 15hz guiding possibilty is a bit well, extreme, and well, difficult

Last edited by Bassnut; 20-02-2010 at 10:33 PM.
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  #27  
Old 20-02-2010, 11:00 PM
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spearo (Frank)
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H,
GET IT so you can teach me !
frank
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  #28  
Old 20-02-2010, 11:14 PM
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strongmanmike (Michael)
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Bah!...the self guide feature is a throwback to the old SCT without mirror lock days it is rather overated, hence the need for the external guide head, hello!! = piggyback guiding again . Look at the enormous plethora of non self guided pin sharp high rsolution award winning pictures out there Mega cooling (without water, plastic tubes, buckets of ice and pumps) low noise, fast download, inert gas filled imaging chambers for no recharging of desicant and no fogging and accurate orthoganal chip placement are all FAR better to have

What ever you get Humi it will be a huge leap up from the DSLR, so have heaps of fun mate!

Mike
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  #29  
Old 21-02-2010, 12:06 PM
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Quote:
Originally Posted by strongmanmike View Post
Bah!...the self guide feature is a throwback to the old SCT without mirror lock days it is rather overated,
Having a guide sensor that is locked next to the imaging sensor cures so many guiding problems....eg differential flexure, focus sag, optical shifts with gravity and thermal changes etc. Plus being very close to the isoplanic area of the imager, AO signals from a near field internal guider have less error than systems set further away.

Quote:
Originally Posted by strongmanmike View Post
hence the need for the external guide head, hello!! = piggyback guiding again .
Why lessen your guiding options? Self guide, external guide, differential guide (STX) and adaptive optics. Sure guide scopes work, but are a rather limiting, and not inexpensive (guide scope with rigid focuser, mounting rings, mounting plate and a separate guider with its own power supply and cables) solution.

Quote:
Originally Posted by strongmanmike View Post
Look at the enormous plethora of non self guided pin sharp high rsolution award winning pictures out there
Funny, I recall last years "Astrophotographer of the year" using something that had self guide (On ya Martin! )

Quote:
Originally Posted by strongmanmike View Post
Mega cooling (without water, plastic tubes, buckets of ice and pumps)
A note to SBIG users, the manual states NOT to use ice with water cooling. An additional 6 degrees delta T is typical with room temperature systems.

Quote:
Originally Posted by strongmanmike View Post
inert gas filled imaging chambers for no recharging of desicant and no fogging and accurate orthoganal chip placement
Dessicants also work and are easily re-charged by the user.

Loss of gas = return to factory?
Contrary to web misinformation, SBIG actually do set their CCD systems up orthogonally using a dedicated optical test bench.

At the end of the day, you pays your money and take your chances.

There are several excellent CCD manufacturers out there, I'm sure most users are happy with their choices for what ever reasons that are important to them.

Was that OK Fred? Not too much biffo?

Last edited by Peter Ward; 21-02-2010 at 12:33 PM. Reason: whymsical
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  #30  
Old 21-02-2010, 07:20 PM
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I inert gas fill my SBig whenever I need to clean it.

I recharge the dessicant in the oven, clean the sensor and reassemble the camera, pull the dummy plug out and squirt in the "Air in a can" duster via a drinking straw ( I lost the little straw ages ago) a few times to dry out the air in the camera. The cans are filled with a fluorocarbon which is essentially inert. Then simply change back in the dessicant. This works really well and you can start using the camera pretty much straight away.

Of course I could take it to work and use the UHP argon as well, but the air duster works.

Cheers
Stuart
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  #31  
Old 22-02-2010, 01:37 AM
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strongmanmike (Michael)
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Quote:
Originally Posted by Peter Ward View Post
Having a guide sensor that is locked next to the imaging sensor cures so many guiding problems....eg differential flexure, focus sag, optical shifts with gravity and thermal changes etc. Plus being very close to the isoplanic area of the imager, AO signals from a near field internal guider have less error than systems set further away.



Why lessen your guiding options? Self guide, external guide, differential guide (STX) and adaptive optics. Sure guide scopes work, but are a rather limiting, and not inexpensive (guide scope with rigid focuser, mounting rings, mounting plate and a separate guider with its own power supply and cables) solution.



Funny, I recall last years "Astrophotographer of the year" using something that had self guide (On ya Martin! )



A note to SBIG users, the manual states NOT to use ice with water cooling. An additional 6 degrees delta T is typical with room temperature systems.



Dessicants also work and are easily re-charged by the user.

Loss of gas = return to factory?
Contrary to web misinformation, SBIG actually do set their CCD systems up orthogonally using a dedicated optical test bench.

At the end of the day, you pays your money and take your chances.

There are several excellent CCD manufacturers out there, I'm sure most users are happy with their choices for what ever reasons that are important to them.

Was that OK Fred? Not too much biffo?


Bah!...all moon landing hoax type "proof"
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  #32  
Old 22-02-2010, 06:44 PM
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Octane (Humayun)
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Update:

I'll most likely be placing an order in the morning.

I'm tingling.

H
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  #33  
Old 22-02-2010, 06:51 PM
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DavidU (Dave)
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Most excellent H.
Quote:
Originally Posted by Octane View Post
Update:

I'll most likely be placing an order in the morning.

I'm tingling.

H
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  #34  
Old 22-02-2010, 07:02 PM
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Omaroo (Chris Malikoff)
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  #35  
Old 22-02-2010, 07:05 PM
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strongmanmike (Michael)
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Quote:
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Update:

I'll most likely be placing an order in the morning.

I'm tingling.

H
On ya Humi...now you will want a new scope...and mount...and...ah, you'll see

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  #36  
Old 22-02-2010, 09:10 PM
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H,

Can't wait for the first light.

Frank
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  #37  
Old 22-02-2010, 09:16 PM
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mill (Martin)
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Quote:
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H,

Can't wait for the first light.

Frank
Or first dark
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  #38  
Old 22-02-2010, 09:39 PM
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strongmanmike (Michael)
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Or first dark
I think you guys are showing a little bias there, I hope you haven't offset Humi with these comments otherwise he will be on a downhill gradient.
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  #39  
Old 22-02-2010, 09:47 PM
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mill (Martin)
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Quote:
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I think you guys are showing a little bias there, I hope you haven't offset Humi with these comments otherwise he will be on a downhill gradient.
Ok flat then or am i BIASed here
H has lots to learn from when the camera arrives
PS: Nice come back there Mike
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  #40  
Old 22-02-2010, 10:39 PM
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All i get is "Noise" from you Guys!

Ahh, had to put that in, as it "Cooled" me right down.

Theo.
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