About the Hotech SCA Field Flattener...
The HoTech SCA Field Flattener is fully multi-coated on two-element lens allowing the most efficient light transmission without sacrificing the precious collected light from your telescope. It accomodates an f/5 to f/8 refractor telescope. You will see bright and sharp image across the entire field.
To capture great images from your telescope, it is essential to position your camera firmly in and on the optical axis of your drawtube/visual back. The SCA T-Adapter center loads your camera in the drawtube/visual back with a simple threading of a compression ring forcing the built-in rubber rings outward radially, thereby centering the camera in the drawtube/visual back for optimal installation.
All drawtube/visual back have manufacturing tolerances. And it requires larger diameter to accept various eyepieces and adapters. When the camera adapter is inserted, the gap between the drawtube/visual back and the inserting device became a slop problem. The rubber rings in the HoTech SCA Field Flattener expand radially according to users own adjustment to fill the gaps. This makes your camera seats firmly in your drawtube/visual back becoming part of your telescope for a secure and repeatable installation.
The optical axis is shifted when the inserting device is locked in by thumbscrew. In some cases, some poorly made unified compression ring can cause unstable tilt when locking in the drawtube due to loose tolerances between the compression ring, inner groove, and the uneven tip of the locking thumbscrew in a drawtube. The SCA T-Adapter adapts your camera without using the thumbscrew or the unified compression ring. (Note: Camera T-Ring not included.)
Small imperfections inside the drawtube like dents and scratches, the rubber rings fill the gaps and faithfully centers your camera in the tube. In addition, even if the drawtube is slightly deformed in diameter, egg-shape, the rubber rings in the HoTech SCA Field Flattener will compensate the differences and faithfully centers your camera.
Short profile design keeps the installed camera stable from low frequency oscillation transferred from the telescope in a windy environment. The back focus of a 2" SCA T-Adapter is 19mm (0.75") and 1.25" SCA T-Adapter is 18mm (0.71") measured from drawtube shoulder to the bottom T-Thread. The all-around adjustable tightness rubber contact damps unwanted vibrations from the telescope provides you a sturdy attachment on your telescope for a stable image capture.
Hotech SCA Field Flattener Features...
- The HoTech SCA Field Flattener is high quality optics designed exclusively for refractor telescopes.
- Brings your camera to the closest optical axis in the drawtube/visual back for the best imaging results.
- The HoTech SCA Field Flattener eliminates drawtube/visual back sloppiness and unstable locking from thumbscrew or unified compression ring.
- It accepts imperfections in the drawtube/visual back and prevents oscillations and dampens vibrations.
- The HoTech SCA Field Flattener standard 2"/48mm filter thread accepts a spectrum of 35mm cameras.
Hotech SCA Field Flattener Specifications...
Equipment Type: Field Flattener
Application: 2" Focusers
Style: Fully multi-coated two-element high efficiency flattener lens
Accomodates: f/5 to f/8 refractor telescopes
Reducer: Zero reducer
Size: 2" SCA Adapter for a secure fit in focuser
Threads for Filter: Accepts 2" / 48mm (M48-P0.75) filter thread
Threads for Camera: Standard T-thread for most imaging cameras attachment
Back focus distance requirement: 55mm - from the shoulder of the T-Thread on the flattener to the surface of the CCD chipHotech Product Number: SCA-FFT58