NEW - William Optics Rack & Pinion SCT focuser with RotoLock and Digital Display Gauge (DDG) for serious astronomers and astrophotographers
William Optics is proud to present this innovative device, the first ever seen on an astronomical telescope. This prominent, revolutionary design is primarily geared towards serious astronomers and astrophotographers. This premium (2") 360 degree rotatable DDG focuser uses new WO RotoLock system for heavy load applications, a silk-smooth 2-speed microfocuser with 10:1 reduction, a 2"-1.25" Rotolock visual back adapter, and a thermometer installed into focuser knob.
The Digital Display Gauge - DDG - allows you to take precise focusing readings down to two decimals instantly. With this device integrated into your telescope you will no longer need your old red flashlight during observations or imaging of the night sky!
The new RotoLock series of adapters from William Optics may well set the "gold" standard for visual backs and eyepiece adapters in the astronomy industry! Thoughtfully designed, exquisitely machined, and artfully presented, these adapters provide a very convenient and robust method to attach eyepieces and accessories to your telescope. Just rotate the golden grip ring clockwise to lock any inserted accessory, or counter-clockwise to release the accessory. Innovative design ensures that you get a very solid hold and the accessory is perfectly centered every time. No thumbscrews to worry about!
This product is designed to last a lifetime and work with virtually any standard SCT/MC telescope. As configured out of the box, the focuser will screw on to any Meade or Celestron SCT telescope up to 9.25" in aperture. These telescopes have a standard male SCT thread which is a 2"x24 TPI thread. The focuser features an inner ring which, when unscrewed (this requires a spanner wrench which is not included), exposes a female 3.28" SCT thread (3.28"x16 TPI). With this step-down ring removed, the focuser will fit the 3.28" SCT male thread on large 11-14" Celestron SCTs. Meade uses a marginally smaller 3.25" thread with the same thread pitch. Hence, while this visual back should also fit most large Meade 10-14" telescopes, there is a very small chance that it might not.
- Minimum focuser height (with 1.25" adapter) = 4.22" (107.3mm)
- Maximum focuser height (with 1.25" adapter) = 5.41" (137.3mm)
- Minimum focuser height (without 1.25" adapter) = 3.72" (94.4mm)
- Maximum focuser height (without 1.25" adapter) = 4.90" (124.4mm)
- Tube travel = 1.18" (30mm)
- Focuser weight (with 1.25" adapter and 3.28" SCT ring) = 2lb-11.5oz (1233gm)
- Weight of 1.25" adapter = 3.0oz (85gm)
- Weight of 3.28" SCT ring = 3.2oz (91gm)
- Focus knob diameter = 1.57" (40mm)
- Microfocus knob diameter = 1.26" (32mm)
- Maximum outer barrel diameter = 3.54" (90mm)
- Maximum microfocuser assembly width = 6.08" (154.5mm)
- Thread: Standard SCT female thread (2" / 24 TPI)
- Scale on focuser drawtube: Yes
- Rotatable: Yes
- Dust plug: One 1.25" dust plug included
Jun 26, 2015
Heavy Duty SCT FocuserPros:
Rotolock,Easy to Use,Strong ConstructionCons:
Heavy,Battery Life,Thread Binding,ProfileComments:
This focuser hasn't left my Celestron C8 SCT telescope since it arrived. I use it for imaging every clear night. I would recommend it. Now about some of the cons... I have to remove the rubber focus knob from the SCT in order to thread the focuser onto the telescope. Once it's in place, I can replace the rubber focus knob. The temperature gauge though novel has never been useful. The digital display gauge ran out of battery almost right away and I haven't found it worthwhile to replace the battery. The focuser is quite long and rotolock while conventient further adds to this length. Better for a long focal length telescope. No room for filter wheels or other gadgets in the theoretical prime back focus distance on my C8 with a 2" camera nosepiece... much less with the 1.25" RotoLock in place... Hasn't stopped me from imaging with it nightly. Others might want to keep shopping around.
This review was provided courtesy of AgenaAstro.comMar 31, 2015
William Optics 2" FocuserPros:
Strong Construction,AccurateCons: Comments:
The William Optics RotoLock SCT Focuser has met my expectations and is a great help for achieving fine focus on my EdgeHD 8. But there are some things to consider before purchasing a focuser for any of the Celestron EdgeHD series scopes. For an in-depth video review of this focuser on youtube see Dakota Starry Nights.
The build quality, RotoLock, DDG and rack & pinion make this a contender and a great buy.
This review was provided courtesy of AgenaAstro.comSort by
|Focuser Telescope Type||SCT|