These are high quality Bahtinov masks with a high Bahtinov factor for easy focusing. They're 3D printed using premium quality American made plastic. It clips into any threaded DSLR lens using a gentle spring loaded action.

The orange plastic makes it easier to see when working in the dark.

Please see photos for example of using the mask.

Masks shown in picture gallery are examples of various sizes, you will receive the size you specified. I have created models for all common thread sizes but I can also do custom oddball thread sizes if requested so feel free to message me with any requests.

Bahtinov factor is calculated using the focal length divided by slot spacing.

Here are some example factor numbers of my masks based on different focal lengths.

135mm = around 168 bahtinov factor

200mm = around 250 bahtinov factor

500mm = around 626 bahtinov factor

Generally anything over 150 will allow you to focus easily.

If you have any more questions or requests please feel free to message me.

I ship out within 1 business days.