Askar 32mm F4 Guide Scope

The ED glass element corrects for chromatic aberration, or color fringing. This creates sharper, more focused guide stars. Guiding software works by finding the exact center (centroid) of a star, and a tighter star profile without color bleed allows for more precise calculations and, ultimately, better tracking accuracy.

The scope uses a helical focuser. You simply rotate the knurled ring on the barrel to move the camera forward or backward. This design is very precise and prevents the camera from rotating, maintaining the orientation of your guide field. It offers 20mm of travel to accommodate various cameras.

Yes, absolutely. At just 303g, it's one of the lighter guide scopes available. This minimal weight is a significant advantage for payload-limited setups like star trackers, as it leaves more capacity for your main camera and lens while reducing the chance of tracking errors caused by overloading the mount.

This guidescope is compatible with almost any standard autoguiding camera. It provides two connection methods:

• 1.25" Barrel: For cameras that slide in like an eyepiece.
• M42x0.75 Thread: For cameras that use a T-thread connection, ensuring a rigid, tilt-free attachment.

Yes. The 128mm focal length provides a good image scale for guiding long focal length telescopes like an RC or SCT. More importantly, the fast f/4 focal ratio is a major benefit in these situations, as it helps pull in fainter guide stars from the sparse star fields often found around distant galaxies, increasing your chances of finding a suitable star anywhere you point.

The primary advantage of an f/4 focal ratio is brightness. It concentrates starlight more effectively onto your guide camera's sensor compared to a slower scope (e.g., f/6 or f/7). This allows you to use shorter guide exposures, which leads to more responsive and accurate corrections from your mount.