Hotech 2" SCA Self-Centering Field Flattener

Hotech 2" SCA Self-Centering Field Flattener Highlights

• Engineered to be a high quality optical flattener

• Includes a built-in self-centering adapter (SCA)

• Eliminates slop in the drawtube/visual back

• Eliminates unstable locking from thumbscrew or unified compression ring

• Built-in Self-Centering Adapter accepts the imperfections inherent in draw tubes and/or visual backs

• Dampens vibration!

• Camera side accepts M42 T-Rings

Hotech 2" SCA Field Flattener - General Information

High Quality Optics Designed for Refractors
This 2" field flattener, a fully multi-coated two-element lens, produces the highest light transmission efficiency without giving up any valuable light your telescope has gathered. Works with f/5 to f/8 refractors. With the Hotech 2" SCA Field Flattener, you'll see clear, crisp images over the entire field.

Eliminates Drawtube & Visual Back Slop
All drawtubes and visual backs have engineering tolerances. The SCA's rubber rings extend radially per the user's own modification to fill the gap. This means your field flattener will be placed securely in your drawtube/visual back, integrating with your telescope system for a solid, consistently reliable installation.

Eliminates Unstable Thumbscrew or Unified Compression Ring Locking
The optical axis fluctuates when an inserted device is secured by thumbscrew. In some instances, some crudely made unified compression rings can result in unstable tilt when locking in the drawtube because of relaxed tolerances between the compression ring, inner groove, and the irregular tip of the locking thumbscrew in a drawtube. The SCA accommodates your camera without requiring a thumbscrew or unified compression ring.

Allows for Drawtube & Visual Back Imperfections
Rubber rings close the gaps brought about by tiny blemishes inside a draw tube or visual back and automatically center your camera in the tube. Furthermore, even if the draw tube diameter is only marginally disturbed, the SCA's rubber rings will still make up the difference and dependably center your camera.

Short Profile Prevents Oscillation
A short profile design maintains the stability of the installed camera under windy conditions from low frequency oscillation transferred from the telescope. The necessary back focus distance for this non-reducer flattener, from T-thread shoulder to the CCD chip, is 55 mm.

Dampens Vibration
The general adjustable constriction of the rubber contact dampens undesired vibrations from the telescope and gives you a solid attachment to your telescope for image capture stability.