Adapters

The coupling between camera and telescope

With the right adapters, T-rings and spacers, you'll set any setup light-tight and to exact backfocus. Choose from M42, M48, M54 and M68 connectors for a stable, backlash-free connection. Available directly from stock and delivered within 48 hours.

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Adapters: the smart links in your setup

Adapters are the “LEGO blocks” of astronomy. They match threads, bayonets and tube diameters so that every component - from DSLR camera to filter wheel - works seamlessly with your telescope.

1. Why can't you live without it?

Advantage	What it does for you
Universal coupling	Put a Canon DSLR, smartphone or planetary camera on the same focuser with no problem.
Tight alignment	Keeps light nicely centered, keeping stars pointed.
Exact distance	With intermediate rings, you tune the sensor distance down to the millimeter (backfocus).
Super fast changeover	One click and you go from visual observation to photography.

2. Popular adapter types & their uses.

Adapter	Simple example
T-ring + T-2	Put a DSLR or system camera on your focuser.
M42 → T-2	Fits old M42 lenses or cameras to modern mounts.
1¼″ → 2″ / 2″ → 1¼″	Switch between eyepieces and filters of different size.
Smartphone holder	Clip your phone for quick moon or planet photos.
Filter wheel spacer	Set a filter wheel at exactly the right light distance.
C-/CS-mount	Mount planetary or guiding cameras directly on the focuser.

3. What do you look for in materials & accuracy?

Aluminum body + Delrin collar - Light, strong and prevents scratches.
Stainless steel thread - Runs smoothly, hardly wears out.
Precision tolerance ≤ 0.05 mm - No perceptible backlash, so tight star images.

4. Here's how to adjust the right backfocus

Check factory specification → read how much mm your flattener or camera needs.
Choose spacer rings → stack 5 mm, 10 mm or 15 mm rings until you come out exactly.
Test in daylight → build the chain on the kitchen table, slide everything in and out to feel if it clicks.
Avoid ‘towers’ → too many rings weaken the structure and may cause additional reflections.

5. Quick tips for astrophoto & EAA

Photo Setup: OTA → reducer/flattener → filter wheel → T-ring → camera.
EAA setup: OTA → C-mount adapter → EAA camera, as short as possible.
Cleaning: blower, soft cloth, drop of isopropyl; no scouring pad or kitchen paper.

20 frequently asked questions about adapters

#	Question	Short answer
1	What adapter do I need for my Canon DSLR?	A Canon T-ring + T-2-to-focuser ring.
2	How do I calculate backfocus?	Manufacturer's value (e.g., 55 mm) minus thicknesses of all spacers.
3	Can I stack two adapters?	Yes, but keep the chain as short as possible for strength.
4	M42 and T-2 seem to be the same, right?	Same diameter (42 mm), different screw pitch.
5	Do I need 2″-to-1¼″ for my filter wheel?	Only if the wheel has 2″ filters and your focuser is 1¼″.
6	How do I avoid backlash?	Choose precision adapters and use collar or anti-grip rings.
7	Does Velcro mounting fit heavy optics?	No, only on light smartphone holders.
8	Can I clean aluminum adapters with alcohol?	Yes, soft cloth + isopropyl, no abrasives.
9	How do I store my adapters?	In a foam case, sorted by diameter.
10	Why Delrin in the collar?	Protects anodization layer, runs smoothly without scratching.
11	Plastic adapters, good idea?	For light work okay; for photos prefer metal.
12	Connecting C-mount camera?	C-mount to T-2 adapter + intermediate ring if needed.
13	What exactly does a T-ring do?	Convert your camera bayonet to standard T-2 threads.
14	Where can I find propeller pitch info?	In the manual or on your focuser manufacturer's website.
15	Loosening stuck adapters?	Grippad + a little silicone grease along the edge.
16	Are SCT adapters different?	With SCT/Maksutov you have to pay extra attention to proper back focus.
17	Can I 3D print an adapter?	Not for precision; print plastic lacks dimensional stability.
18	Keeping dust free?	Bellows + lens pen, store in sealed box.
19	Do I need autoguider adapter?	Only if your guider camera has a different mount.
20	Labeling adapters?	Use fine permanent marker or small tape labels.

With the right adapters, you'll have any combination working in seconds - from photography to visual enjoyment. Choose precision, set your backfocus properly and experience the difference in razor-sharp, perfectly aligned constellations!