![]() ![]() ![]() Rother Valley Optics supplies a range of Bahtinov masks, so you should be able to find one to suit your own telescope’s specs. Rother Valley Optics Advanced Bahtinov Mask rother valley optics bahtinov mask This Bahtinov mask is light, meaning it shouldn’t affect the balance of your telescope too much during visual observing or during long exposure astrophotography sessions. Three metal posts on the mask enable it to grip your telescope tube firmly, and come with scratch-resistant covers that should protect the surface of your tube. This Bahtinov mask works with refractors, Dobsonians, Maksutov Cassegrains and Schmidt-Cassegrains, with the outer diameter of the mask supporting objective lenses in the range of 60-90mm. 5 of the best Bahtinov masks Vbestlife Bahtinov Mask Or, you could venture to make your own in our guide how to make a Bahtinov mask. However, focusing on a bright star is much easier and if the stars are in focus, deep-sky objects will be too.Ī Bahtinov Mask makes it easy to get stars in focus.Īs we’ve noted above, when placed on the front of a telescope aimed at a bright star, you’ll see a distinct diffraction pattern comprising an ‘X’ and a horizontal line.Ĭapturing a series of exposures of the diffraction pattern and checking them allows you to adjust focus between images until the line perfectly bisects the ‘X’, which indicates the best focus position.īelow we’ve picked out some Bahtinov masks that are available to buy online. Bahtinov masks and imaging deep-sky objectsĪccurate focus on deep-sky objects is key to successful imaging, but it’s surprisingly difficult as many objects are too dim to focus on. Just as a Newtonian Reflector’s spider vane produces diffraction spikes on bright stars, the ‘vanes’ on a Bahtinov Mask produce a complex diffraction resulting in a cross and a horizontal line.Īdjusting focus until the line bisects the cross confirms perfect focus. However, the use of a Bahtinov Mask makes achieving accurate focus really simple. Observing a diffracted bright star with this mask in place and adjusting the focus until the line perfectly bisects the cross ensures that accurate focus is achieved.” Using a Bahtinov mask for astrophotography Credit: Tony Rowell / Getty Imagesįocus is the single most critical component of any successful image but it can be remarkably difficult to achieve.ĭespite the use of digital cameras and their live view features in astrophotography, determining when a test star is at perfect focus is rather subjective. However, the Bahtinov mask’s diffraction spikes form a very specific shape comprising a cross with a line passing through it. The special shape of the cut-outs in the mask produce a set of diffraction spikes in the same manner as the secondary mirror spider vanes on a Newtonian reflector. A Bahtinov mask is a specially cut visor made from cardboard or plastic that you place on the front of a telescope to help you focus accurately. ![]()
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