The Bahtinov mask is named after the inventor Pavel Bahtinov. This focussing aid enables clear focusing of astro images in the focus of your telescope or with a camera lens.
- Place the mask on the telescope and point it at a bright star.
- Switch on the camera and observe the constellation on Live View or on the computer.
- f the image is not exactly sharp, the centre line is shifted. Adjust the focuser until the central line runs exactly through the centre of the star.
- You have now achieved optimum sharpness. Remove the mask from the telescope again and you can start exposing the image.
Practical tips from APM Telescopes- Focusing with a Bahtinov mask is suitable for deep sky photography at the focus of the telescope or with a camera lens. Correctors, Barlow lenses can be used.
- Use a star of medium brightness for focussing, it should not be too bright but also not too dark. The reflex lines must be clearly recognisable.
- The star should not be exactly in the centre, as the field of view of the corrected telescope or objective is often not 100% flat. Take a star in the outer third of the field. This will give you a better averaged sharpness for the entire image.
Simple attachment by clipping on
Simple and precise focussing of all cameras such as DSLR, CCD or astro cameras possible.
Scope of Delivery:
Products specifications
| Temperature range | max 80° |
| Material | PETG with UV resistance |
| suitable for | 8" Newton |
