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Dr Benway
professor emeritus


Reged: 03/27/08
Posts: 540
Loc: Abilene, TX
iOptron Mini Tower with Trapezium Wedge
      #3157675 - 06/11/09 03:24 PM Attachment (170 downloads)

It's been cloudy, raining and windy since I received the wedge from Steve. I checked the weather today and I MIGHT be able to find Polaris this evening! First light is on the schedule for tonight.

John Bozeman

Attachment

--------------------
Astro-Tech AT8RC
Astro-Tech AT65EDQ
Explore Scientific ED127
Takahashi NJP
Takahashi EM-10
iOptron IEQ45 Modified
QHY8PRO OSC
QHY9M
QHY9C
QHY22
SBIG STF-8300M
Modded Canon XT

http://www.jwbozeman.com


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Dr Benway
professor emeritus


Reged: 03/27/08
Posts: 540
Loc: Abilene, TX
Re: iOptron Mini Tower with Trapezium Wedge new [Re: Dr Benway]
      #3157685 - 06/11/09 03:26 PM Attachment (213 downloads)

Here is the view from the other side. This is one of the first lot of 20 made by ADM for Trapezium Telescope Services.

Attachment

--------------------
Astro-Tech AT8RC
Astro-Tech AT65EDQ
Explore Scientific ED127
Takahashi NJP
Takahashi EM-10
iOptron IEQ45 Modified
QHY8PRO OSC
QHY9M
QHY9C
QHY22
SBIG STF-8300M
Modded Canon XT

http://www.jwbozeman.com


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sam32
super member


Reged: 07/26/06
Posts: 125
Re: iOptron Mini Tower with Trapezium Wedge new [Re: Dr Benway]
      #3158047 - 06/11/09 07:36 PM

John,

I have been considering getting the bearing upgrade and then the wedge. Have you tried the wedge on the MT tripod (the one in your picture appears t be a lot more sunstantial) and would that setup be okay for AP in your opinion ? I'd be using fairly light scopes in the weight range of 7-12 pounds. Also, is the wedge something that you just add and then its easy to switch back and forth between eq. and alt- az modes ? Or do you have to remove the wedge to go back to alt-az mode ?

Thanks,

Sam


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Dr Benway
professor emeritus


Reged: 03/27/08
Posts: 540
Loc: Abilene, TX
Re: iOptron Mini Tower with Trapezium Wedge new [Re: sam32]
      #3158150 - 06/11/09 08:54 PM

Hi Sam,

My MT has had the bearing upgrade. The tripod in the picture is the stock MT tripod. I shot a lot of AP with it in alt/az mode, and have been limited to 56 seconds due to field rotation. I bought the wedge to see if I could extend my exposures to around 2 minutes unguided. I use a C8 with Hyperstar3, so I am imaging at F/2.

The wedge is attached to the tripod with three M10 socket head screws. The MT head is attached with a single M12 socket head screw. It doesn't take very long to set it up or tear it down. You switch from Alt/Az to EQ with the handset. You have to remove the wedge to use it in alt/az mode.

John

--------------------
Astro-Tech AT8RC
Astro-Tech AT65EDQ
Explore Scientific ED127
Takahashi NJP
Takahashi EM-10
iOptron IEQ45 Modified
QHY8PRO OSC
QHY9M
QHY9C
QHY22
SBIG STF-8300M
Modded Canon XT

http://www.jwbozeman.com


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Sky Captain
Metal Whisperer


Reged: 11/07/04
Posts: 10375
Loc: Loc: Loc:
Re: iOptron Mini Tower with Trapezium Wedge new [Re: Dr Benway]
      #3158182 - 06/11/09 09:29 PM

Thats nice looking John. Is there only one adjuster on the side for getting the right elevation\angle. Does it seem strong enough if thats the case.

--------------------

Kerry



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Luigi
Postmaster


Reged: 07/03/07
Posts: 5317
Loc: MA
Re: iOptron Mini Tower with Trapezium Wedge new [Re: Sky Captain]
      #3158629 - 06/12/09 07:21 AM

Yeah. The elevation adjustment looks a bit puny to me too.

--------------------
17.5" f/5 Dob. IM-715 MCT. 120ED. Lunt 60mm Ha.
Zeiss, Leica, Fujinon, Nikon, Pentax, Bushnell bins


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Dr Benway
professor emeritus


Reged: 03/27/08
Posts: 540
Loc: Abilene, TX
Re: iOptron Mini Tower with Trapezium Wedge new [Re: Luigi]
      #3158700 - 06/12/09 08:55 AM Attachment (104 downloads)

Its got plenty of beef to hold the rated load or more.

John

Attachment

--------------------
Astro-Tech AT8RC
Astro-Tech AT65EDQ
Explore Scientific ED127
Takahashi NJP
Takahashi EM-10
iOptron IEQ45 Modified
QHY8PRO OSC
QHY9M
QHY9C
QHY22
SBIG STF-8300M
Modded Canon XT

http://www.jwbozeman.com


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Dr Benway
professor emeritus


Reged: 03/27/08
Posts: 540
Loc: Abilene, TX
Re: iOptron Mini Tower with Trapezium Wedge new [Re: Dr Benway]
      #3158702 - 06/12/09 08:56 AM Attachment (119 downloads)

The other side

Attachment

--------------------
Astro-Tech AT8RC
Astro-Tech AT65EDQ
Explore Scientific ED127
Takahashi NJP
Takahashi EM-10
iOptron IEQ45 Modified
QHY8PRO OSC
QHY9M
QHY9C
QHY22
SBIG STF-8300M
Modded Canon XT

http://www.jwbozeman.com


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Chuii
newbie


Reged: 12/25/05
Posts: 3
Re: iOptron Mini Tower with Trapezium Wedge new [Re: Dr Benway]
      #3159820 - 06/12/09 08:57 PM

Hi John
I have a Minitower(MT) without bearing upgrade. For the visual use, does the MT with bearing upgrade perform better (without the wedge) than the stock MT?
Chuii


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Sky Captain
Metal Whisperer


Reged: 11/07/04
Posts: 10375
Loc: Loc: Loc:
Re: iOptron Mini Tower with Trapezium Wedge new [Re: Dr Benway]
      #3159910 - 06/12/09 10:08 PM

Thanks for the close up shots John, it was hard to tell in the other photo's. Your right, they do look strong.

--------------------

Kerry



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Dr Benway
professor emeritus


Reged: 03/27/08
Posts: 540
Loc: Abilene, TX
Re: iOptron Mini Tower with Trapezium Wedge new [Re: Chuii]
      #3160323 - 06/13/09 08:34 AM

I really can't see any improvement in visual observation. The mount is quieter. Target DSOs stay centered in the FOV for hours with or without the bearing upgrade. It's a different world doing alt/az astrophotography, however. I usually shoot a sequence of 20 exposures at 56 seconds duration. I would typically reject 50% of the frames prior to the upgrade. I noticed a sharp reduction in bad frames after the upgrade. I may throw out 3 frames in 20, worst case.

John Bozeman

--------------------
Astro-Tech AT8RC
Astro-Tech AT65EDQ
Explore Scientific ED127
Takahashi NJP
Takahashi EM-10
iOptron IEQ45 Modified
QHY8PRO OSC
QHY9M
QHY9C
QHY22
SBIG STF-8300M
Modded Canon XT

http://www.jwbozeman.com


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Luigi
Postmaster


Reged: 07/03/07
Posts: 5317
Loc: MA
Re: iOptron Mini Tower with Trapezium Wedge new [Re: Dr Benway]
      #3160349 - 06/13/09 09:03 AM

Yeah. That adjustable brace on the side opposite the adjustment screw looks like it adds what's needed for rigidity. I think it would have been better to design it with both positioned as far from the pivot as reasonable to increase the arm they work over.

--------------------
17.5" f/5 Dob. IM-715 MCT. 120ED. Lunt 60mm Ha.
Zeiss, Leica, Fujinon, Nikon, Pentax, Bushnell bins


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Chuii
newbie


Reged: 12/25/05
Posts: 3
Re: iOptron Mini Tower with Trapezium Wedge new [Re: Dr Benway]
      #3160822 - 06/13/09 02:32 PM

Hi John
Thank you for your comments.
Chuii


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Dr Benway
professor emeritus


Reged: 03/27/08
Posts: 540
Loc: Abilene, TX
Re: iOptron Mini Tower with Trapezium Wedge new [Re: Chuii]
      #3171908 - 06/19/09 04:45 PM Attachment (112 downloads)

I managed to get about three hours observing time on this mount earlier in the week. I had an Orion ST120 mounted and it did fine. I lined up Polaris as the PARK position, did a 3 star alignment and was off and running. It tracks very well. The sky is back to cloudy again, so I set my AP rig on the mount and took few pictures. Steve made me a Losmandy style CW shaft and it is in the picture with an 11# weight.

I just ran a fake 3 star alignment in the house, and it worked great. Didn't strain a bit.

John

Attachment

--------------------
Astro-Tech AT8RC
Astro-Tech AT65EDQ
Explore Scientific ED127
Takahashi NJP
Takahashi EM-10
iOptron IEQ45 Modified
QHY8PRO OSC
QHY9M
QHY9C
QHY22
SBIG STF-8300M
Modded Canon XT

http://www.jwbozeman.com


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Dr Benway
professor emeritus


Reged: 03/27/08
Posts: 540
Loc: Abilene, TX
Re: iOptron Mini Tower with Trapezium Wedge new [Re: Dr Benway]
      #3171910 - 06/19/09 04:47 PM Attachment (118 downloads)

Fully dressed with the hard plastic dew shield...

Attachment

--------------------
Astro-Tech AT8RC
Astro-Tech AT65EDQ
Explore Scientific ED127
Takahashi NJP
Takahashi EM-10
iOptron IEQ45 Modified
QHY8PRO OSC
QHY9M
QHY9C
QHY22
SBIG STF-8300M
Modded Canon XT

http://www.jwbozeman.com


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Figment
member


Reged: 08/08/08
Posts: 32
Loc: NH
Re: iOptron Mini Tower with Trapezium Wedge new [Re: Dr Benway]
      #3172473 - 06/19/09 11:36 PM

It looks like the center of gravity is pretty far away from the center of the tripod. Are you noticing any stability issues?

--------------------
Edge HD 9.25 - iOptron Mini Tower Pro - PST
C6-A - iOptron Mini Tower - Explore Scientific 80ED
Astrotrac travel system - Baader Hyperion Set
ES 14mm/100 - ES 20mm/100 - ES 30mm/82 - ES 6mm/82


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Luigi
Postmaster


Reged: 07/03/07
Posts: 5317
Loc: MA
Re: iOptron Mini Tower with Trapezium Wedge new [Re: Figment]
      #3172855 - 06/20/09 09:09 AM

With it set to your low latitude, the short arm for the latitude adjustment screw looks even more precarious. It looks like the CG of the scope and mount is offset pretty far from the center of the tripod. How stable is it against toppling? On the positive side it looks like there's plenty of clearance to operate without a meridian flip of you wanted to.

So, is there an advantage of this over something like a CG5ASGT or HEQ5? It seems like taking a alt-az silk purse and turning into an equatorial sow's ear.

--------------------
17.5" f/5 Dob. IM-715 MCT. 120ED. Lunt 60mm Ha.
Zeiss, Leica, Fujinon, Nikon, Pentax, Bushnell bins


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Sky Captain
Metal Whisperer


Reged: 11/07/04
Posts: 10375
Loc: Loc: Loc:
Re: iOptron Mini Tower with Trapezium Wedge new [Re: Dr Benway]
      #3172927 - 06/20/09 09:49 AM

CG that far over is a bit scary looking for sure.


BTW, nice CW shaft.

--------------------

Kerry



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hudson_yak
Carpal Tunnel


Reged: 11/15/07
Posts: 1548
Loc: Hyde Park, NY, USA
Re: iOptron Mini Tower with Trapezium Wedge new [Re: Sky Captain]
      #3172944 - 06/20/09 09:57 AM

Agreed, that does not look safe at all. The wedge should be tilted the other way so the mount is carried over the center of the tripod, more like a typical SCT fork-wedge setup.

Mike

--------------------
Tele Vue-85 + Quarter Hitch + Berlebach UNI 24
Meade 12" LightBridge
Orion ED100 + Losmandy GM-8
Orion SVP
Meade 8" LX10


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tim53
Postmaster


Reged: 12/17/04
Posts: 7146
Loc: Highland Park, CA
Re: iOptron Mini Tower with Trapezium Wedge new [Re: hudson_yak]
      #3172948 - 06/20/09 09:59 AM

If it were me, I'd make a tray for the bottom of the tripod and set a 25lb barbell weight on the south side of it, or attach a couple 10lb weights to the south two legs.

-Tim.

--------------------
Recent acquisition: Tulley and Sons 3" achromat on Altazimuth mount, circa ~late 1820s


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