Model:  tkastroservice_bm_s135
Part Number:  BM-S135

This Bahtinov Mask enables precise focus of the Samyang 135mm f2 lens.

The Mask is put onto the lens hood. Using Live View one can easily set the focus very precisely. Thin strips make the diffraction spikes easily visible. 

TKAstroservice recommends storing and using the Bahtinov mask in temperatures below 50°C (122°F). 

This product is 3D printed, so the usual minor imperfections, like layer lines, associated with 3D printing can be seen on the printed parts.