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TPO 2" Crayford Focuser for Schmidt-Cassegrain Telescopes


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  • Rotates a full 360-degrees
  • Fits Schmidt-Cassegrain Telescopes
  • A 10:1 fine adjustment knob for superior fine tuning
  • Eliminates SCT image shift.
  • Custom CNC machined from aluminum and black anodized
  • Includes 1.25-inch adapter.


Product Details

  • This Third Planet Optics Dual-Speed Linear Focuser for Schmidt-Cassegrain telescopes features the most recent innovation in focuser design to hit the astronomy market in recent years. Designed specifically to meet the heavier equipment and stability requirements of astrophotography and heavy eyepieces, the linear stability and repeatable quality of focus reached with this focuser will keep you coming back for more spectacular views of and sharper images of the night sky! By using this 2-inch Crayford SCT focuser in lieu of the telescope's primary mirror, image shifting is completely eliminated. This can be a mere nuisance for casual observers, but is a serious problem for imagers. Built with an innovative stainless steel rail system that provides extended, consistent, and linear contact with the focusing mechanism and the inside of the focuser body, even when the focuser is fully extended. This constant contact prevents slop from building up in the focuser drawtube. The result is zero flexure throughout the focus travel range, even in the worst case scenario when the focuser is parallel to the ground and carrying a heavy load such as a large CCD camera. This new linear bearing rail system also allows for the use of heavier loads up to 9-pounds. A 10:1 fine adjustment knob gives the user superior fine-tuning ability with remarkable stability for an extended period of time. The focuser position can be locked in place with the large thumbscrew on top of the focuser for critical imaging applications. The underside of the focuser features another screw to control the focusing tension. A laser-etched measurement scale in the drawtube helps with consistently rapid focusing. This focuser also has 360-degrees of rotation ability so that it can be turned in any direction for better observing. Attaches to the rear thread of Schmidt-Cassegrain telescopes. Custom CNC machined from aluminum and black anodized for superior aesthetics in a dependable and durable unit.

    TPO 2-inch Crayford Focuser for Schmidt-Cassegrain Telescopes Specifications...

    • Minimum focuser height without 1.25-inch adapter: 4.65-inches or 118 mm.
    • Maximum focuser height without 1.25-inch adapter: 6.65-inches or 169 mm.
    • 1.25-inch adapter height: 0.39-inches
    • Tube travel length: 2-inches
    • Focuser weight with 1.25-inch adapter: 25.6-ounces
    • Outside diameter of drawtube: 2.32-inches
    • Diameter of focus knob: 1.57-inches
    • Diameter of micro-focus knob: 1.06-inches
    • Flange thread: Standard SCT female thread (2-inch, 24 TPI)
    • Measurement scale on focuser drawtube: Yes
    • Rotatable: Yes
    • Dust plug: 1.25-inch dust plug included

    TPO Product Number: CF-LST

  • specifications

    Barrel Size2"
    Included AdaptersOne 1.25" with Dust Plug
    Warranty2 Year Warranty
  • included items

    • Rotates a full 360-degrees
    • Fits Schmidt-Cassegrain Telescopes
    • A 10:1 fine adjustment knob for superior fine tuning
    • Eliminates SCT image shift.
    • Custom CNC machined from aluminum and black anodized
    • Includes 1.25-inch adapter.


Product Reviews

Customer Reviews
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  • autofocuser setups
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  • Meade LX200
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  • photography
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United States United States

TPO focuser

I have this focuser on my Meade LX200. It has made focusing for visual and astrophotography much easier. You do have to play with the tension knobs to make sure the drawtube does not slip backwards especially during photography. The only drawback I have found is that the autofocuser setups (ZWO eaf, Pegasus) do not support the TPO focuser.


TPO focuser

This has made focusing my C8 and ZWOasi294 extremely easy. The operation is smooth and I think it provides a secure attachment for my camera. It is heavy and balancing was a challenge but it was doable. It was a good buy although the price dropped two weeks after I bought mine. I would buy it again as it does exactly what I wanted it do.

William P.
United States

Night and Day

I needed to do this a long time ago. It is a major improvement and you use your existing star diagonal. Another distributor talks about needing a diagonal for refractors but I have no idea what they are talking about. You simply set this focuser an inch or so back and then turn the old telescope focuser a number of turns until the image comes into focus. From then on you do not touch the old focuser and the old endless focusing procedure ends for good.

Leslie S.
United States

Needs Improvement

Either the quality control or the design is weak in one crucial area. The main body of the focuser tends to suddenly come loose from the base that threads on to the SCT threads. The 3 setscrews that are intentionally assembled slightly loose to allow rotation of the main body are not substantial enough to reliably keep the body from suddenly falling off the screw-on base. I've had several close calls with my 2" diagonal and 2" eyepieces adding so much weight that the focuser body almost suddenly fell off. You must watch for this constantly which is very hard to do in the dark.

United States

ok focuser

This focuser does everything it is supposed to do but it is not very smooth.I would not buy this particular brand of focuser again.