Aluminum Bahtinov Focusing Mask 170-240mm suitable for Diameter 175-220mm. Perfect focusing for your CCD,DSLR or Webcam in seconds. Light weight so you wont upset the balance on your scope.
|Suitable for telescope diameter||85-120mm||105-150mm||150-200mm||65-100mm||175-220mm|
1.Bathinov Focusing Mask is made of aluminum alloy and adopts anodized aluminum process, which has long service life
2.The Svbony Bathinov Focusing Mask has 3 holes and can be fixed with 3 screws to prevent the mask from falling down
3.Perfect focusing for your CCD,DSLR or Webcam in seconds
4.Light weight so you won't upset the balance on your scope
5.We provide you with 5 different sizes to choose from, if you don't know what size to choose, maybe we can help you