Hotech SCA Self-Centering Field Flattener

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  • Regular price £190.00
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The Hotech SCA system ensures this premium quality 2-element multicoated optical flattener is positioned precisely on the optical axis for optimum results.

Suitable for f5-f8 refractor telescopes.

The spacing (from the attachment point to the camera sensor) is 55mm so, if using a DSLR camera, you need only a T-Ring.

SCA Brings your Camera to the Closest Optical Axis in the Drawtube/Visual back for the BEST Imaging Results

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.

SCA Eliminates Drawtube/Visual Back Slop

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 SCA 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.

SCA Eliminates unstable locking from thumbscrew or unified compression ring

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. 

SCA Accepts the Imperfection of a Drawtube/Visual Back

Small imperfection 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 SCA will compensate the differences and faithfully centers your camera. 

Short SCA Profile Prevents Oscillation

Short profile design keeps the installed camera stable from low frequency oscillation transferred from the telescope in a windy environment.  The non-reducer flattener's back focuse distance, T-Thread shoulder to the CCD chip, requirement is 55mm.

SCA Damps Vibration

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.

The 2" Field Flattener Accepts 2" Filter Thread

SCA Field Flattener has built-in standard 2”/48mm (M48-P0.75) filter thread. T-ring thread accepts all kinds of 35mm cameras.