TS-Optics Bahtinov focusing mask — 250–285 mm outside diameter This Bahtinov mask fits telescope dew shields or camera lenses with an outside diameter from 250 to 285 mm. Select it by the physical attachment diameter, not the optical aperture.
Manufacturer model: TS-Optics Bahtinov focusing mask — 250–285 mm outside diameter · Specifications checked against manufacturer data on 2026-11-04
This Bahtinov mask fits telescope dew shields or camera lenses with an outside diameter from 250 to 285 mm. Select it by the physical attachment diameter, not the optical aperture.
Fit the mask, point at a suitable star and view the diffraction pattern on the camera. Adjust focus until the central spike sits midway between the other two spikes, then remove the mask before recording the target.
The black plastic mask is secured by three screws with protective covers. The manufacturer’s upper limit is 285 mm; fit at 286–290 mm is not specified, despite the existing store title.
TS-Optics manufacturer documentation
Manufacturer fitting range is 250–285 mm outside diameter. Store title says 250–290 mm and is unchanged; fit at 286–290 mm is not claimed.
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TS-Optics Bahtinov focusing mask — 250–285 mm outside diameter This Bahtinov mask fits telescope dew shields or camera lenses with an outside diameter from 250 to 285 mm. Select it by the physical attachment diameter, not the optical aperture.
Manufacturer model: TS-Optics Bahtinov focusing mask — 250–285 mm outside diameter · Specifications checked against manufacturer data on 2026-11-04
