Antlia Off Axis Guider and Filter Drawer Assembly
Antlia Off Axis Guider and Filter Drawer AssemblyAntlia Off Axis Guider and Filter Drawer AssemblyAntlia Off Axis Guider and Filter Drawer AssemblyAntlia Off Axis Guider and Filter Drawer Assembly

Antlia Off Axis Guider and Filter Drawer Assembly

  (1 Review)
✓ 2 year warranty


3x in stock shipped 1-2 working days

About this product

Model:  antlia_oag_fd
Part Number:  OAG

The Antlia OAG and filter drawer assembly integrates both filter drawer and OAG into one seamless device.

This combined OAG and Filter Drawer provides flexure-free Off Axis Guiding and considerable weight saving (compared to separate OAG/Filter Wheel combinations).


  • Large pick-off prism 12x12mm enables use of a larger guiding sensor for a greater selection of guide stars.
  • Mono-block (one-piece) design with OAG body directly connected to filter drawer.
  • Comfortably fits APS-C sensor and Full Frame sensor.
  •  Total thickness plus both side adapters only 37.5mm.
  •  Perfect for cameras with 17.5mm back focus distance without additional adapters.
  •  OAG is CNC machined from a single aluminium block for maximum rigidity.
  •  High-quality 1.25' helical focuser with generous 10mm travel ensures you will find optimum focus for your guide star.
  •  Adjustable prism height for optimum illumination of the auto-guider field of view. (The smaller the imaging sensor in your camera, the further down the prism can be set without interfering with sensor).
  •  Dovetail-type threaded adapters are attached to the body with grub screws, so they can be 360° rotated and locked to align with the telescope and camera.
  •  You can rotate the OAG 360° to find a guide star.
  •  A wide variety of adapters are provided to enable multiple configurations. Includes 7 popular threaded sizes: M42, M48, M54, and M68 male and female for both sides. (no M42 female)
  •  Filter sliders of 50mm diameter and 50x50mm square plus adapter rings for 1.25", 31mm and 36mm filters and other adapters can be ordered separately.



What's in the box

  • 1 x Off-Axis Guider Body,
  • 1 x Helical Focuser,
  • 1 x 2-inch (M48*0.75) Filter Slider,
  • 1 x M42-Male Adapter,
  • 1 x M48-Male Adapter,
  • 1 x M48-Female Adapter,
  • 1 x M54-Female Adapter,
  • 1 x M54-Male Adapter,
  • 1 x M68-Female Adapter,
  • 1 x M68-Male Adapter,
  • 1 x M42-6mm*1 for 12.5mm BFD,
  • 1 x M42-1.25-27mm

Customer reviews

Average Rating (1 Review):  
Write a Review and share your opinions!

Rating (max 5):  
04 August 2023  | 

This feels like a substantial piece of kit. Handy thickness of 37.5mm means that perfect backfocus was achieved just attaching it to my ASI2600 camera (which already has 17.5mm). I set it up during the day time and then fin tuned on the first clear night. Lots of accessories included and the filter drawer has a good strong magnet to keep it closed, so no risk of it dropping to the ground. The large prism meant I had plenty of stars to choose from with my ZWO 290 mini camera. No vignetting when the prism was fully in, even with my APSC sized main camera sensor. I use a ZWO AM5 harmonic drive mount, so regularly get good guiding at approx 0.8rms. With the OAG this improved further to approx 0.5rms. Really impressed with it.


Please fill in the form below to ask a question.

Please add the two numbers

Christmas at FLO:    Extended Returns    |    Last Delivery Dates    |    Astronomers Gift Guide    |    Kids Gift Guide    |    Beginners Telescope Guide    |    New Telescope Accessory Guide    |    Gift Vouchers