When shooting wide-field astrophotography at f/2.0, even a micro-adjustment on the focus ring can mean the difference between pin-sharp stars and soft, bloated target images. This precision Bahtinov mask utilizes diffraction optics to form a distinct 3-line crosshair on bright stars, allowing you to establish exact critical focus before running your imaging sequence.
Custom Fit for Rokinon/Samyang 135mm f/2.0: Engineered precisely to friction-fit securely onto the front of the lens barrel/lens hood without slipping or scratching.
High-Contrast Diffraction Grid: Optimized slot angles maximize light transmission for bright, clean diffraction spikes—even on medium-magnitude stars.
Durable & Weather-Resistant: 3D-printed with premium, heat-resistant PETG to withstand outdoor conditions.
Non-Marring Design: Smooth contact surface ensures no wear or abrasion to your lens body.
Lightweight & Portable: Fits inside your camera bag alongside your lens or astro-rig accessories.
Attach the Mask: Mount the Bahtinov mask onto the front of your Rokinon/Samyang 135mm f/2.0 lens.
Target a Bright Star: Point your camera toward a bright star (e.g., Vega, Sirius, or Arcturus) and turn on camera Live View with maximum zoom.
Align the Diffraction Spikes: Rotate your lens focus ring until the center diffraction spike sits exactly halfway between the outer 'X' spikes.
Remove & Shoot: Lock your focus ring (if applicable), remove the mask, and begin taking exposures.
When shooting wide-field astrophotography at f/2.0, even a micro-adjustment on the focus ring can mean the difference between pin-sharp stars and soft, bloated target images. This precision Bahtinov mask utilizes diffraction optics to form a distinct 3-line crosshair on bright stars, allowing you to establish exact critical focus before running your imaging sequence.
Custom Fit for Rokinon/Samyang 135mm f/2.0: Engineered precisely to friction-fit securely onto the front of the lens barrel/lens hood without slipping or scratching.
High-Contrast Diffraction Grid: Optimized slot angles maximize light transmission for bright, clean diffraction spikes—even on medium-magnitude stars.
Durable & Weather-Resistant: 3D-printed with premium, heat-resistant PETG to withstand outdoor conditions.
Non-Marring Design: Smooth contact surface ensures no wear or abrasion to your lens body.
Lightweight & Portable: Fits inside your camera bag alongside your lens or astro-rig accessories.
Attach the Mask: Mount the Bahtinov mask onto the front of your Rokinon/Samyang 135mm f/2.0 lens.
Target a Bright Star: Point your camera toward a bright star (e.g., Vega, Sirius, or Arcturus) and turn on camera Live View with maximum zoom.
Align the Diffraction Spikes: Rotate your lens focus ring until the center diffraction spike sits exactly halfway between the outer 'X' spikes.
Remove & Shoot: Lock your focus ring (if applicable), remove the mask, and begin taking exposures.
