Astromania Bahtinov Mask Focusing Mask for Telescopes - FM180mm for a Tube Outer Diameter (OD) from 195mm-240mm - can be Mounted with the Brass Screws Inside or Outside the drawtube
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Product details
| Management number | 234216988 | Release Date | 2026/06/27 | List Price | US$9.20 | Model Number | 234216988 | ||
|---|---|---|---|---|---|---|---|---|---|
| Category | |||||||||
- Bahtinov masks take the guesswork out of focusing and even get over the seeing conditions as it is a mathematical type approach to the task; the best focus for your telescope quickly and easily
- Suitable for use on all types of telescope; they are made from precision laser cut enforced plexiglass that is stiff and long lasting; they will never be brittle in the cold; unlike some other masks which are made from normal plastics
- The masks grip the telescope tube gently but firmly with three metal posts which have non-scratching silicon sleeves to protect valued telescope surface; mask remains centered since 3-post mounting; while fitting a wider range of telescopes
- Made from 2mm thick laser cut plexiglass and securing screws are capped with soft plastic so that do not damage telescope; They have adjustment latitude of about 195-240mm that adjustable to fit optical tubes unlike masks which only fit one telescope
- Please be assured these focusing masks will work excellently for both reflectors and refractors with whatever focal length; all you need to do is to measure telescope tube size and choose right size of mask contact us if not sure where to measure
| ASIN | B01M9CIEKV |
|---|---|
| Brand | Astromania |
| Mount | Manual Mount |
| Coating | Uncoated |
| Focus Type | Manual Focus |
| Zoom Ratio | 1:1 |
| Finderscope | Reflex |
| Item Weight | 3 Ounces |
| Manufacturer | Astromania |
| Model Number | SKU_AM_BFM180 |
| Power Source | Manual Operation |
| Field Of View | 1.04 Degrees |
| Compatible Devices | Telescopes with outer diameter 195mm-240mm |
| OpticalTube Length | 180 Millimeters |
| Additional Features | Mathematical focusing approach |
| Exit Pupil Diameter | 97.5 Millimeters |
| Objective Lens Diameter | 195 Millimeters |
| Focal Length Description | 240 millimeters |
| Manufacturer Part Number | SKU_AM_BFM180 |
| Eye Piece Lens Description | Barlow |
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