Small-format astro cameras; DSLR/mirrorless bodies not recommended
Full-frame coverage
No
Back focus
RASA front-cell camera spacing, model-specific adapters required
Corrected field
Fast prime-focus astrograph field
Mechanical
Focuser
Ultra-Stable Focus System
Weight
3.8 kg / 8.4 lb
Astrophotography Fit
Best for fast deep-sky imaging with careful collimation and tilt control when the mount, camera format, and correction hardware are chosen as one system.
Celestron RASA 6 sits in the telescope slot for fast deep-sky imaging with careful collimation and tilt control. The useful headline specs are aperture 152 mm, focal length 335 mm, f/2.2.
Camera coverage: Small-format astro cameras; DSLR/mirrorless bodies not recommended. Image circle: 22 mm. Back focus: RASA front-cell camera spacing, model-specific adapters required.
Fast astrographs collect signal quickly, but they are unforgiving: collimation, tilt, filter behavior, and back-focus spacing show up immediately in star shapes.
Weight matters here: 3.8 kg / 8.4 lb. Leave payload headroom for the camera, guider, focuser, dew control, and cables instead of judging the mount by bare tube weight alone.
Best paired with
Rigid focuser, tilt adjuster, and exact corrector spacing
Cooled cameras with a sensor inside the corrected image circle
High-throughput filters that behave well at fast focal ratios
Not recommended for
Users who do not want to tune collimation, tilt, and spacing
Thick or narrow filters that show strong bandpass shift at fast focal ratios
Loose camera adapters or focusers that cannot hold the imaging train square
Where To Buy
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