SBIG OAG-8300 with 2.0x24 thread pattern - M48 Off Axis Guider

SBIG Off-Axis guider for all STF-8300 models

The innovative OAG-8300 transforms your STF-8300 CCD camera into a self-guiding camera system. This OAG is designed for a 5 or 8 position filter wheel , but can also be used without a filter wheel using an optional spacer ring.

What is unique about the OAG-8300 is its 7-element internal construction. Like regular OAGs it contains a deflection prism, but in addition to that has a diagonal with an integrated 0.7x reducer for the guiding camera. As a result of this you achieve a decent field of view even with a small guiding sensor and gain light sensitivity as well: You will always find a guide star.

Features and advantages of the OAG-8300:

Backward compatible with all STF-8300 models

High-quality construction

Integrated 0.7x reducer for an extended field and increased light sensitivity

Detailed manual available for download

Optical length only 22.9 mm

Why use an off-axis guider?

Especially Newtonian owners are familiar with the problem: Even though your guide optics are perfectly mounted and your guider is well calibrated, stars aren´t quite round. This is caused by relative movement between primary and guide optics, which the guider can´t register and therefore cannot compensate. An OAG solves this problem by fusing telescope and guide scope. You also profit from the higher light sensitivity of your telescope and thus can use fainter stars as guide stars.