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Askar Metal Bahtinov Mask for FMA180 - M48x0.75 external thread

Name: Askar Metal Bahtinov Mask for FMA180 - M48x0.75 external thread
Brand: Askar Sharpstar
SKU: FMA180-BA
Price: 46.95 EUR

The Bahtinov mask allows accurate focusing and fits directly into the M48x0.75 - 2" filter thread on the FMA 180 APO telephoto lens.

Thread on the telescope side: M48x0.75 external thread

Frame material: aluminum black anodized - the mask itself is made of plastic

Fits to many camera lenses with transition adapter

Manufacturer: Askar Sharpstar

Product number: FMA180-BA

EUR 46,95

incl. 19 % VAT (DE)

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excl. 6.95 € shipping costs (DE)

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Askar Metal Bahtinov Mask for FMA180 - M48x0.75 external thread

The Bahtinov mask allows accurate focusing and fits directly into the M48x0.75 - 2" filter thread on the FMA 180 APO telephoto lens.

Thread on the telescope side: M48x0.75 external thread

Frame material: aluminum black anodized - the mask itself is made of plastic

Fits to many camera lenses with transition adapter

Details..
Technical data..
In the box..

Askar Bahtinov Mask for FMA 180 and for many camera lenses

The Bahtinov mask is named after the inventor Pavel Bahtinov. This focusing aid enables clear focusing of astro images in the focus of your telescope or with a camera lens.

Attaching the Bahtinov mask to your telescope is very easy. Just screw it to the M48 front thread of your FMA180 lens.

This is how focusing with your camera on the telescope or objective works

Put the mask on the telescope and point it at a bright star.

Turn on the camera and observe the constellation on Live View or on the computer.

If the image is not exactly in focus, the central line has been shifted. Adjust the focuser until the central line passes exactly through the center of the star.

Now you have achieved the optimum sharpness. Remove the mask from the telescope and you can start exposing the image.

Practical tips from Teleskop-Service

Focusing with a Bahtinov mask is suitable for deep-sky photography in the focus of the telescope or with a camera lens. Correctors and Barlow lenses can be used.

Use a star of medium brightness for focusing, it should not be too bright, but also not too dark. The reflex lines must be easily visible.

The star should not be exactly in the center, because 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 better averaged sharpness for the entire image.