Antlia OAG and Filter Drawer Assembly

Antlia OAG and Filter Drawer Assembly

OAG means Off-Axis Guider. Antlia OAG and filter drawer assembly is an innovative accessory that integrates filter drawer and OAG. It allows you to utilize your primary imaging telescope for auto-guiding, without needing a heavy additional guide scope. The OAG uses a small internal pick-off prism as a mirror to reflect part of the incoming light from the telescope to your independent guide camera. Since the off-axis guiding and imaging camera shares the same image train as the main detector, it handles very well with all bending and tilting that may be present in your setup, and you will achieve tracking accuracy greater than you would with a separate guide scope.

Antlia OAG and Filter Drawer Assembly Features

Directly suited for filters in 2" filter cell

Large 12*12 mm pick-out prism, which allows the use of a larger guiding sensor and therefore a greater choice of guide stars.

Mono-block (one-piece) design with the OAG body directly connected to the filter drawer.

Comfortably fits APS-C sensor and full frame sensor.

The total thickness plus both side adapters is 37.5 mm.

It´s right for cameras with 17.5 mm back focus distance without additional adapters.

The OAG has been CNC-machined from a single aluminium block and provides a very rigid platform for guiding.

High-quality helical focuser assembly, a 1.25-inch helical focuser with a generous 10 mm of travel allows you will find the optimum focus for your guide star.

The prism height can be adjusted to better illuminate the field of view of your auto guider. The smaller the imaging sensor in your camera the further down the prism can be set without interfering with the sensor.

Dovetail-type threaded adapters are attached to the body with grub screws, so the adapters 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 is provided to accompany multiple configurations. Antlia OAG includes 7 popular threaded sizes: M42, M48, M54, and M68 male and female for both sides. (no M42 female)

Application is not limited to a specific brand instrument.

Filter sliders for 50 mm round or 50x50 mm square filters, adapter rings for 1.25", 31 mm or 36 mm filters, as well as other adapters, can be ordered separately.

You need to ensure that the distance from the prism to the main camera sensor is exactly equal to the distance from the prism to the guider sensor.