Re: [tec-scopes] Re: Connecting SBIG 8300 with self guiding filter wheel to TEC 140.


Dec 31, 2014

 


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#26208 Dec 31, 2014

Hello and Happy New Year from Australia.

I am looking at getting an adapter for my TEC 140 which should arrive maybe March 2015. Yuri tells me they have had to go back to the Feathertouch 3545. I am wondering if anyone could tell me what parts/adapters they have used if you have the same set up as me. I am a little lost using the precise parts build it yourself as am unsure the actual device on the TEC side of things. I have options of TEC 140 FF without lock ring or TEC 140 Field Flattener and other choices and the self guiding filter wheel is the SBIG STT FW8G-STT Self-Guiding FW 2.156-24 thread.

I have ordered the TEC field flattener with my scope that will go onto the Feathertouch 3545 attached to the SBIG STT FW8G-STT Self-Guiding FW 2.156-24 thread. I entered a zero value and got an adapter of 12.7mm and am unsure if that is correct. Any help with specific advice would be greatly appreciated.

Mark Bateman



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#26209 Dec 31, 2014

The backfocus of the FF is 85mm.  The TEC field-flattener screws directly onto the focuser after you remove the star-diagonal adapter.  I have a QSI camera, and I bought a camera-specific adapter from Astro-Physics that gave me 86mm.  It mounts to the FF with a "bayonet" fitting, which I put in quotation marks, because it doesn't work like the bayonet coupling used by Nikon F lenses and other cameras from film days.  A screw-on ring locks the adapter to the FF.  A-P has adapters for some SBIG models, but I don't know if they work with the 8300s.  Look through their "Photographic and Imaging Accessories" to see if there's anything you can use.  Bernard Miller uses an SBIG camera like yours with a TEC 140.  Maybe he can tell you what he uses (see www.azstarman.net).  Back in Sep 2014, Topboxman2000 posted some excellent photos showing how this stuff goes together.  His photos were a big help to me, enabling me to visualize the system.



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#26210 Dec 31, 2014

Hi Mark,

Take a look at the pictures of my setup. This uses QSI660wsg camera with the same 2.156" thread as your camera. It shows three different ways to attach the camera to my TEC 140.

Imaging Train Setups - Peter

Imaging Train Setups - Peter Three different ways to attach QSI camera to TEC 140 APO refractor.



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#26212 Dec 31, 2014

Hi Mark,

It's me again. There is a cheaper alternative and uses nosepiece which I prefer so you can easily rotate the camera.

Go to Astro-Physics web site and find the following parts:

A1263: Adapts to TEC Field Flattener. Other side is 2.7". Spacing is 15.7mm. $40

ADA20132: 2" Thin Adapter with 3 thumbscrews. Attaches to A1263 adapter using 2.7" threads. Use supplied SBIG nosepiece to attach to ADA20132. Spacing is 10.9mm. $50

Total back focus spacing: 26.60mm

Total system back focus: 26.6mm + 57.7mm (camera + 1.5mm thick nosepiece) = 84.30mm.

Total cost: $90

This is my preference over Precise Parts that uses all threaded connection mainly to be able to easily rotate the camera by loosening the three thumbscrews.

Peter



---In tec-scopes@yahoogroups.com, pnagy@...> wrote :

Hi Mark,

The back focus information for SBIG cameras can be found at:

www.sbig.com/support/product-documentation/backfocus-table/

Look for "Camera + FW8G-STT Self-Guiding FW (w/o adapter plate)" and "Threaded Adapter Plate adds".

Camera + FW8G-STT Self-Guiding FW (w/o adapter plate) + 3mm filter (Astrodon): 52.5mmThreaded Adapter Plate adds: 3.7mmTotal back focus: 56.2mm

Required spacing: 85mm - 56.2mm = 28.8mm.

85mm is the required total back focus for TEC Field Flattener.

The total back focus of SBIG STT FW8G-STT Self-Guiding FW is 56.2mm. This means you need 28.8mm spacing between TEC flattener and camera's input where 2.156" threads are. Probably Precise Parts is the best place to get. Astro-Physics A3512 adapter spacing is 33.73 which is a little too long for your camera. This adapter is designed for QSI wsg cameras with 2.156" threads.

I went to Precise Parts web site to build an adapter.

Select "TEC" for Telescope/Objective SideSelect "SBIG" for Camera/Eyepiece Side

Select TEC 140/180/200 Field Flattener at left sideSelect Your Camera at right side

Enter 28.8mm in Adapter Effective Length

The result was a whopping $219.00

Peter



---In tec-scopes@yahoogroups.com, pnagy@...> wrote :

Hi Mark,

Take a look at the pictures of my setup. This uses QSI660wsg camera with the same 2.156" thread as your camera. It shows three different ways to attach the camera to my TEC 140.

Imaging Train Setups - Peter

Imaging Train Setups - Peter Three different ways to attach QSI camera to TEC 140 APO refractor.



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#26213 Dec 31, 2014

The result was a whopping $219.00 Yes, but you only buy it once, and in the context of, say, $6500-$7000 for the complete TEC 140 set-up plus whatever you spent for your hi-end mount, $219 is trivial.



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#26214 Dec 31, 2014

I was just about to send a reply expressing the same sentiment. I have

several adapters made by Precise Parts, and they are top quality

resulting in a setup that is not cobbled together.



Someone commented about using the AP parts and being able to rotate the

camera. I have an 8300 camera on my 140. Although I am just

familiarizing myself with its use, can't one also rotate the camera by

loosening the lock ring on the FF?



Don Moses



On 12/31/14 11:29 AM, calypte@... [tec-scopes] wrote:

>

> > The result was a whopping $219.00

>

> Yes, but you only buy it once, and in the context of, say, $6500-$7000

> for the complete TEC 140 set-up plus whatever you spent for your

> hi-end mount, $219 is trivial.

>

>







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#26215 Dec 31, 2014

   To: tec-scopes@yahoogroups.comSubject: Re: [tec-scopes] Re: Connecting SBIG 8300 with self guidingfilter wheel to TEC 140.



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#26216 Dec 31, 2014

Yuri is correct but it's more P.I.T.A. than using nosepiece and thumbscrews with compression ring holding the nosepiece. Most of the time I have to use two rubber straps to loosen the Bayonet nut in order to rotate the camera and re-tighten (many times with two rubber straps) the Bayonet nut. It's harder to be more precise using Bayonet nut than nosepiece. That's my IMHO.

I use A-P 2.7" accessories to build my own imaging train.

Peter

---In tec-scopes@yahoogroups.com, tec@...> wrote :

   To: tec-scopes@yahoogroups.comSubject: Re: [tec-scopes] Re: Connecting SBIG 8300 with self guidingfilter wheel to TEC 140.



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#26222 Dec 31, 2014

Thank you so much Peter for all your help. I have read your suggestions and will go over them again tonight in piece and quiet. You have given me exactly what I want as I am not that confident with all this connecting adaptors so again thank you. I will get back to you if I have more question.



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#26223 Dec 31, 2014

Thank you for your response. I have had a quick read but will go back over your suggestions once I have some piece and quiet.

Mark



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#26226 Jan 1, 2015

Hello again Peter. Thank you again for the photos as I am definitely a visual type of person and know I feel as if I am on top of this. Can you tell me how you find the electronic focuser as I am looking at the same but there seems to be three options

HSM---Handy Stepper Motor with manual focus over-ride

FB-II-KIT 1---Focuser Boss II Electronic Focusing Control

FB-II-KIT 2---Focuser Boss II Electronic Focusing Control 3 piece kit

Thank you

Mark



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#26227 Jan 2, 2015

Yes it is a confusing web site. Go to this link:

starlightinstruments.com/store/index.php?route=product/product&path=96&product_id=305  1) Choose your stepper motor size: Not needed, I am ordering the Handy Motor2) Handy Motor Upgrade with built-in Temp Compensation: HSM35 + $60.003) Wireless Option: Your choice. I would not recommend it. Does not work with Android phone.4) Hand Controller: Your choice: I think it needs work. Slow speed is too slow, fast speed is too fast.5) Temperature Compensation--Not needed if purchasing HSM motor: Not interested.6) 2nd Focuser Control Board: Your choice7) Power Supply: Your choice.

I am assuming your FT focuser is 3.5" so HSM35 Handy Motor works with 3.5" focusers.

Wireless Option only works in Ad-hoc mode meaning it acts like a router. You will have to disable communicating with your wireless home network in your computer/laptop. It does work with my laptop wirelessly but my laptop is disconnected from wireless home network. Does not work with later Android phone/tablet.

Hand Controller is kind of a pain to use. The slow speed is one tick at a time. One tick is about 1.3 microns!!!!!! Hold the buttons longer, the motor speeds up but way too fast. Nothing in between. I just disconnect the HSM motor by rotating the motor CCW and focus manually by hand.

If you have another scope with FT focuser, then it might be handy to have 2nd focuser controller board. I don't have this option.

Peter

---In tec-scopes@yahoogroups.com, markbateman1905@...> wrote :

Hello again Peter. Thank you again for the photos as I am definitely a visual type of person and know I feel as if I am on top of this. Can you tell me how you find the electronic focuser as I am looking at the same but there seems to be three options

HSM---Handy Stepper Motor with manual focus over-ride

FB-II-KIT 1---Focuser Boss II Electronic Focusing Control

FB-II-KIT 2---Focuser Boss II Electronic Focusing Control 3 piece kit

Thank you

Mark



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#26242 Jan 3, 2015

Does anyone make an adapter that lets you easily and accurately rotate a camera, without having to loosen the lock ring on the field flattener or using a nosepiece with compression screws?For example, something that securely connects to the field flattener on one end and the camera on the other, and has a knob you can turn to rotate the camera in precise, repeatable amounts?

I want to be able to consistently rotate the camera to the exact same positions (e.g., 0 degrees, 27 degrees, etc.) so I can use the same sets of flats.

I currently use a nosepiece and put marks on it and the thing it goes into to show where 0 degrees is, 45 degrees is, etc., but that's a pain and it's almost impossible to be consistent.



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#26243 Jan 3, 2015

I bought the wireless option and have never used it.  As Peter said, it only works in Ad-hoc mode and I need my PC to be connected to the home wireless network so can't also connect it to the focuser.I also have a wireless adapter (SkyLink) for my Celestron mount but it has the same issue.

Wireless sounds great and would be great if everything worked together, but in my experience they don't.  It's easier to attach everything to a USB hub, using USB-to-serial adapters when needed.



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#26244 Jan 3, 2015

the discussion here has been very interesting to me, lurker, as an illustration of pragmatics.



in the past i had looked at a fine astrophotograph and thought to myself, "wow, great optics." (this is, after all, a TEC forum.) but it turns out to be optics on top of mechanical parts on top of mechanical adjustments on top of digital networks on top of control software on top of processing software on top of operating systems on top of hardware on top of ... well, the astronomer is always there, fretting about extension tube flexion and doggedly manning the OAG -- either on site, or at his remote control location.

is astrophotography a dark art? i can't tell. a dark art would be passed on from adepts to initiates, in small doses, guiding their dawning awareness of the occult secrets and mystic paradoxes. and there would be a fixed domain of true knowledge common to all. astrophotography seems more like alchemy, its secret written in the code of suppliers and products, procedures and adjustments, tolerances and hacks, all contrived to produce the gold of perfect imagery.



bruce



Wireless sounds great and would be great if everything worked together, but in my experience they don't.  It's easier to attach everything to a USB hub, using USB-to-serial adapters when needed.







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#26246 Jan 3, 2015

On 1/3/2015 7:18 AM, Bruce MacEvoybmacevoy@... [tec-scopes] wrote:

the discussion here hasbeen very interesting to me, lurker, as an illustration ofpragmatics.





in the past i hadlooked at a fine astrophotograph and thought to myself,"wow, great optics." (this is, after all, a TEC forum.) butit turns out to be optics on top of mechanical parts on topof mechanical adjustments on top of digital networks on topof control software on top of processing software on top ofoperating systems on top of hardware on top of ... well, theastronomer is always there, fretting about extension tubeflexion and doggedly manning the OAG -- either on site, orat his remote control location.



is astrophotography adark art? i can't tell. a dark art would be passed on fromadepts to initiates, in small doses, guiding their dawningawareness of the occult secrets and mystic paradoxes. andthere would be a fixed domain of true knowledge common toall. astrophotography seems more like alchemy, its secretwritten in the code of suppliers and products, proceduresand adjustments, tolerances and hacks, all contrived toproduce the gold of perfect imagery.





bruce



Wirelesssounds great and would be great if everything workedtogether, but in my experience they don't.. It's easierto attach everything to a USB hub, using USB-to-serialadapters when needed.



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#26248 Jan 3, 2015

Well, you can learn some of those dark arts here:AIC Newsletter Volume 8, number 1



AIC Newsletter Volume 8, number 1 To view this email in a browser, click here. This message contains graphics. If you do not see the graphics, click here.   AIC Volume 8, number 1 Quick links: AIC ...



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