OPT 2" SCT Focuser - Crayford Dual Speed

OPT 2" SCT Focuser - Crayford Dual Speed
  • Designed for Schmidt Cassegrain telescopes to fit all standard SCT rear threads.
  • The OPT 2" Dual Speed SCT Crayford Rear Focuser is custom machined from aluminum and black anodized for good looks and durability.
  • 1:10 speeds work for visual applications through astrophotography and rotates a full 360 degrees.
  • The OPT 2" Dual Speed SCT Crayford Rear Focuser permits use of 2" accessories.
  • Includes 1.25" adapter.


OPT 2" Dual Speed SCT Crayford Focuser

Do you use a Schmidt Cassegrain telescope? If so, you may have encountered a common problem known as image shift - or difficulty achieving perfect focus. Oceanside Photo and Telescope is here to help with the OPT Dual Speed SCT Crayford Focuser.

In order to pass savings along to our customers, OPT engages the services of a leading manufacturer to custom CNC machine these speciality 2" Dual Speed Crayford Focusers meant specifically for the Schmidt Cassegrain Telescope. Aluminum means lightweight, and from there they are then black anodized for good looks and durability. These focusers are designed to fit almost every model SCT - including Meade and Celestron - and are compatible with any standard SCT thread. If you're unsure of the fit, just check your telescope's rear cell for an approximate 2" diameter male thread, or contact our experts to insure a perfect match.

Inside the OPT 1:10 Dual Speed SCT Crayford Focuser, you'll find anti-reflection baffles and coatings to keep any stray light to a minimum and provide the best contrast possible. Precision roller bearings incorporated into the tube design allow for smooth functioning on the roller shaft and the black anodized barrel is laser-etched with a millimeter scale to give you 100% precise callibration markings. The focusers stops where you want it to... and stays put. The OPT 1:10 Dual Speed SCT Crayford Focuser will also allow up to 1" of focus travel, too!

Worried about putting your good eyepieces into an "unbrand" focuser? Don't be. There's no harsh aluminum screws here to scratch eyepiece barrels. The OPT 1:10 Dual Speed SCT Crayford Focuser uses only brass compression ring fittings that gently cradle your prized eyepieces or 2" star diagonals with a secure fit that you'd expect from high quality. As an added bonus, we've included a 1.25" to 2" adapter, too... So all of your accessories are good right out of the box!

OPT 2" Dual Speed SCT Crayford Focuser Features

  • Minimum focuser height without 1.25" adapter: 4.29" or 109mm.
  • Minimum focuser height with 1.25" adapter: 5.28" or 134mm.
  • Maximum focuser height without 1.25" adapter> 4.88" or 124mm.
  • Tube Travel Length: 0.99" or 25mm
  • Focuser Weight (including 1.25" adapter): 1lb-10.5oz or 751gm
  • Diameter of Focus Knob: 1.57" or 40mm
  • Diameter of Microfocus Knob: 1.02" or 26mm
  • Outer Barrel Diameter: 3.3" or 84mm
  • Standard SCT Female Thread
  • Calibrated Millimeter Markings on Focuser Outer Tube
  • 360 Degree Fully Rotatable
  • Dust Plug Included
OPT Product Number: CFSCT
Additional Information

Additional Information

Manufacturer OPT
Focuser Design Crayford
Focuser or Mask Size 2" Drawtube
Focus Control Manual
Warranty 1 Year Warranty

Customer Reviews 3 item(s)

Just tried this focuser on the back of my C9.25. It works great - solid attachment - and rotatable, what a bonus not having to adjust the diagonal all the time. I put a 2 Explore Scientific Diagonal in the focuser and it works very smoothly. A really nice piece of equipment! Well done OPT.
1= Houston, We Have a Problem & 5= It's Out of This World
Review by James / (Posted on 2/4/2012)
very good! for quality and cost. The coupling to a SCT 8 and I solved the perennial problem the approach.
1= Houston, We Have a Problem & 5= It's Out of This World
Review by AISA, Roberto / (Posted on 9/7/2010)
OPT Focuser
This is very well made and works quite well. The only problem I ran into was when I screwed in a skylight filter the focuser would not move from compressed position there is a slight interference with the threads. I had to machine a recess on the threads of any filter I wanted to use. Sort of a pain what helped is I have an Engineering background and good knowledge machining so I was able to correct the problem with a lath.
1= Houston, We Have a Problem & 5= It's Out of This World
Review by Larry / (Posted on 11/30/2009)
Included Items

Included Items

  • OPT \r\n2" Dual Speed SCT Crayford Focuser
  • 1.25" Adapter
  • Dust Plug
Questions & Answers

Product Questions

Can this focuser be used on a Skywatcher MAK 180?
I have a Celestron 9.25 SCT, not an Edge HD, but the original kind. Can I put a focal reducer on first, and then the focuser? Can I obtain a focus with that kind of setup?
how much weight can this take? I have an SBIG 8300 with a 5 position filter wheel and a auto guider, when we add the drag of connections and I am around 8-10 lb
Hi, hope you´re doing great

Mi name is Emilio Mora and I practice direct focus Astrophotography with a Celeron EGDE HD 8. I have a Focal Reducer 0.7 for the EDGE HD, a T-Adapter and a DSLR modified Canon T3. Will I stumble on any focus problem with this set up using the OPT 2" SCT Focuser - Crayford Dual Speed, Item # OS-CFSCT?

Many thanks in advance for any information you could provide

Best Regards
I own one of these and its great! Anyway to make it motorized?

I have a Celestron Edge HD 11 that I normally use with a 2” diagonal attached to the visual back and then the camera (Canon 6D) attached to the diagonal. Will this focuser work with this arrangement and where should I put it? Before or after the diagonal?
Good morning!

Will this focuser work with the Meade LX90 12" ACF? If so. Will the
Focuser help balance out the ota? Being a 12" SCT the corrector plate
Is huge! My scope tends to be front heavy due to the "Titanic" size CP.
How to attach to this Focuser TPO 2" SCT Quartz Dielectric Diagonal (OS-D2SCTDIQ). Instead of the 2" adapter on the thread?
Will this crayford install on a vintage Celestron C-5A by itself or with adapters?

Thank you for your help;.

What are the dimensions? Primarily the barrel diameter.
Will this work on a Meade 2120?
My SCT is a Celestron NexStar GPS, C11. The rear visual back has a treaded opening 3.25" OD, and 2" ID.How can I interface the crayford focuser?
I'm curious if this essentially replaces the visual back or if I'd also need a new visual back to run 2" optics/eyepieces in my 8" Edge HD. Thanks,
Will this work with the 10" LX200 Classic? the threads on the back of the OTA are 3 1/4"
Is this focuser compatable with the Skywatcher 180mm Maksutov cassegrain, and if so is an adapter needed to attach it to the visual back?

can I use this focuser withe celestron nextar 8se?

Good afternoon! Will cost how many delivery to St. Petersburg? (Russia)
Hi! I have SW MAK150. Will this focuser work with the SW MAK150?
I have a Meade LX90 8"ACF telescope. Can I use the OPT "2 SCT focuser - Crayfor Dual Speed in it.

Joaquin Gonzalez H
What is the range of the focal length extension?
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