![]() ![]() The 150mm system is used on ultra-wide angle lenses which need special adaptors to enable them to accept standard filters such as Sony FE 12-24mm GM, Nikon 14-24mm F2.8 F-Mount, Samyang 14mm F2.8, Sigma 14mm f/1.8 DG HSM Art, Canon EF 14 mm f/2.8L II USM, etc. The 100mm system is usually used with lenses that have a filter thread diameter of up to 82mm, this usually covers more common wide to telephoto lenses (16mm - 200mm). ![]() Which size of the Focus on Stars filter you choose will depend on the camera system and the lenses you own. There are 2 different sizes of the Focus on Stars filter, these are based on the industry standard 100mm x 100mm and 150mm x 150mm filters which landscape photographers will already be familiar with and will likely already have a filter holder/system to use the Focus on Stars filter with. Gabor does a great job of explaining things on his website, so I'd recommend reading through it and watching the videos here This refined intricate design creates much more vivid diffraction spikes, making it much easier to achieve critical focus on stars, even with an ultra-wide angle lens. The Focus on Stars is a high-quality glass filter with a much more intricate design, effectively like having multiple Bahtinov masks in a single filter. He took the basic premise of the Bahtinov mask and refined it into the high precision focusing tool for landscape Astrophotography which he named 'Focus On Stars’. ![]() This problem has been solved by Hungarian Astro Photographer Gábor Takács. Sounds good right? Well, as handy as the Bahtinov mask is for telescopes and longer focal lengths, it doesn’t really work for the wide-angle lenses used in most wide-field astrophotography. This filter was aptly named the Bahtinov mask, it is a precision tool to help focus telescopes and longer focal length lenses when photographing the night sky. In 2005, a Russian amateur astrophotographer named Pavel Bahtinov invented a filter which would revolutionise astrophotography.
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