Zenithstar 81 WIFD

This William Optics 2" Field Flattener & Reducer has been designed to optimize the flat-field imaging performance of William Optics GT71, GT81, Z81 & Z103 refractors. The APO triplet optics of the Flat6AIII are made with Ohara glass and fully multi-coated to provide good illumination and a beautifully flat field across 97% of full frame sensors. The reducing factor is 0.8X.

Designed with M63 threads on the telescope side, the FLAT6AIII will thread directly into the telescope. Just remove the three screws on the focuser adapter, take off the adapter, and thread the focal reducer/field flattener on in it's stead. The Flat6AIII has 2" threads on the opposite side to accept a 48mm (Wide) T ring for your DSLR. There is even a slot behind the 2" threads to accept an M48 filter.

Finally, if you take a look at the pictures to your left, you will notice that the FLAT6AIII is adjustable to help you achieve the proper back focus. Adjustment distances & back focus, as well as the image circle measurement for each of the telescopes are listed below.

The ZWO ASI2600MC Duo is a groundbreaking color astrophotography camera designed for stargazing enthusiasts. Combining a high-performance main camera with an integrated guide camera, it simplifies the astrophotography experience without compromising quality.

• Dual Functionality: Imaging and Guiding in One
  Combines imaging and guiding in one device, eliminating the need for a separate guide scope or off-axis guider.

• High-Performance Main Camera
  Features a 26MP Sony IMX571 sensor with 16-bit ADC, 14 stops of dynamic range, 80% quantum efficiency, and cooling down to -35°C below ambient for sharp, noise-free images.

• Advanced Built-In Guide Camera
  Uses the sensitive ASI220MM Mini sensor for precise guiding, even through light-reducing filters like dual narrowband filters.

• Anti-Dew System
  Built-in heater prevents dew formation on the sensor glass, ideal for humid conditions.

• Fast Data Transfer
  USB 3.0 with a 512MB DDR3 buffer ensures quick and stable file transfers.

• Easy Tilt Adjustment
  Rear-facing screws allow quick sensor tilt correction for better image quality.