TS Optics Bahtinov Mask 175-220 mm
Achieving sharp focus is one of the most important steps in astrophotography - and one of the most difficult. The Bahtinov mask from TS Optics is a simple plastic accessory that solves this problem reliably and without compromise. It fits directly onto the front of your telescope, covering objectives with an outer diameter of 175 to 220 mm. The mask's distinctive grid pattern immediately shows you whether the image is truly in focus or whether the focuser still needs a small adjustment.
How does a Bahtinov mask work?
The mask is named after its inventor, Pavel Bahtinov, whose idea transformed the way astrophotographers focus on stars. The principle is elegantly simple. The grid splits the light from a star into three diffraction spikes. When the central spike sits exactly between the two outer spikes, your telescope is focused on the focal plane. Precise focusing with a Bahtinov mask is significantly more reliable than any other visual method, because it removes the guesswork entirely.
Quick and tool-free attachment
Attaching the mask to your telescope takes only a few seconds. Each mask comes with three screws. Remove the plastic covers, thread the screws through the corresponding holes, and replace the covers. The mask then sits firmly and securely on the telescope tube - no tools needed.
Step-by-step focusing process
The focusing process itself is straightforward:
- Point your telescope at a bright star.
- Enable live view on your camera.
- On the screen, you will see three light spikes.
- If the central spike is not perfectly centred between the other two, slowly turn the focuser until all three spikes align.
- Once the spikes align, focus is at its optimum.
The Bahtinov mask for astrophotography is then removed and you can start your exposures immediately - with confidence that every frame will be sharp.
Technical specifications
| Parameter |
Value |
| Compatible objective diameter |
175-220 mm |
| Material |
Plastic |
| Attachment method |
Three screws, tool-free |
| Compatible use |
Astrophotography |
| Brand |
TS Optics |
Who is this mask for?
The TS Optics Bahtinov mask is ideal for anyone who photographs the night sky with a telescope in the 175-220 mm aperture range. Whether you are just starting out with astrophotography or already have experience, this mask will make your focusing process faster, easier, and far more accurate. It is a small investment that makes a real difference to the quality of your images.
Key benefits at a glance
- Fits telescopes with an objective diameter of 175-220 mm
- Eliminates guesswork - precise star focus every time
- Attaches in seconds without any tools
- Lightweight plastic construction - easy to carry and store
- Suitable for all camera types used in astrophotography
