Stellarvue Photographic Field Flattener

Refractor telescopes naturally produce a curved image plane, which causes stars at the edges of your frame to look elongated or distorted. This field flattener corrects that curvature, ensuring your stars remain pinpoint sharp from the center all the way to the corners of your sensor.

This unit is precision-engineered for Stellarvue 80mm refractors equipped with 2.5-inch focusers, specifically the SVX80T-3SV, SV80T-3SV, SVX80T-25SV, and SV80ST models. It is not designed for other telescope brands or different focal lengths.

The 55mm backfocus is the industry standard for most imaging setups. If you are using a standard DSLR with a T-ring, you will likely be at the correct distance already, as the T-ring itself accounts for the necessary spacing.

Yes, this flattener is designed to provide full-frame correction. It will maintain image quality across the entire sensor area, making it an excellent choice if you are using a full-frame DSLR or dedicated astronomy camera.

The M48 threading has a wider opening than the older M42 T-thread standard. This helps reduce vignetting, especially when using larger full-frame sensors, allowing for better light transmission and cleaner corners in your images.