RigTonightYour first deep-sky astrophotography rig: three sensible starting points
The most common beginner mistake is buying a big telescope first. For deep-sky imaging, a short focal length and a solid mount make the first year far more rewarding: wide fields are forgiving of tracking errors, polar alignment and seeing.
Here are three starting points. Open any of them in the builder to see the full checks.
1. Tracker and a mini astrograph
A star tracker carrying a camera and a lens-sized 180 mm refractor. Light, portable, and enough for the big targets: the Milky Way's nebulae, Andromeda, the Orion region.
Why it works: 180 mm on an APS-C sensor covers about 7.5° × 5°, so small tracking errors don't show. Limits: small galaxies are tiny, and there's no cooling or guiding. New to all this? Start with Astrophotography for beginners, and see Star tracker or equatorial mount? for when to move on from a tracker.
2. Small apochromat and a cooled colour camera
A 50–70 mm refractor with a built-in flattener, a cooled colour camera and a dual-band filter, on a compact strain-wave mount.
Why it works: the cooled sensor gives clean data, and a fixed back focus means few spacer headaches. Limits: most galaxies are small at 264 mm.
3. A 400 mm astrograph with guiding
A step up in focal length, with a guide scope and a camera that covers most targets well.
Why it works: about 1.9 ″/px is slightly undersampled for typical 2–3″ seeing, which is normal for a 400 mm rig and handled well by dithering and drizzle, and the guiding ratio is comfortable. Limits: a bigger investment, and many filters and spacers to get right. The builder walks you through them.
What to check before you buy
- Payload: keep the whole rig well under the mount's rating. See mount payload.
- Back focus: make sure the camera and filter wheel fit the corrector. See back focus.
- Sampling: match pixel size to focal length and seeing. See image scale.
- Power: make sure your battery covers a whole night. See field power.
Specs in the builder are approximate unless marked verified. Always confirm on the manufacturer's page before buying.