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Astromania Bahtinov Mask Focusing Mask For Telescopes

- Fm80mm For A Tube Out...

USD $39.57

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SKU: N/A Cameras & Photo / Binoculars & Telescopes / Telescope Parts & Accessories / Other Telescope Parts

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Brand New Astromania Bahtinov Mask Focusing Mask for Telescopes - FM80mm for a Tube Outer Diameter (OD) from 85mm-120mm - can be Mounted with The Brass Screws Inside or Outside The drawtube
Manufacturer model: SKU_AM_BFM80
  • 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 - reflectors, rafractors, Dobsonians, Mak-Cas and SCTs. They are made from precision laser cut enforced plexiglass, which 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 you valued telescope surface. This prevents slippage, whilst allowing the mask to remaining perfectly central. Because of this 3-post mounting, the mask remains centered, whilst fitting a wider range of telescopes.
  • They are made from 2mm thick laser cut plexiglass and the securing screws are capped with soft plastic so that they do not damage your telescope.These high quality Bahtinov masks are adjustable to fit a wide range of optical tubes, unlike masks which are only able to fit one telescope. They have adjustment latitude of about 85-120mm, depending on model, in aperture making them very versatile.
  • Please be assured that these focusing masks will work excellently for both reflectors and refractors with whatever focal length. All you need to do is to measure your telescope tube size and choose the right size of the mask (contact us if you are not sure where to measure).

  • Description
    Product Description
    Astromania Bahtinov Mask Focusing Mask for Telescopes
    The Bahtinov mask has become the preferred method of focusing a telescope, either visually or when imaging with a CCD camera, DSLR or webcam. They are an inexpensive tool which will allow you to achieve pin-sharp levels of focus, saving you time and improving your work. Simply place the mask over the front of your ‘scope, align the scope towards a star. The mask displays a unique diffraction profile, one part of the diffraction pattern moves in response to changes in focus and displays error as a displacement from a clearly defined point.
    Specifition Nominal size: 85-120mm Material: made of sturdy plastic. Thickness: 2mm Telescope min outer diameter: 80mm Telescope max inner diameter: 130mm Read more
    Two Installation Modes Inside The Dew Tube
    Place the brass screw on the inside of the the dew tube. Slide each of the three grip pegs inward until they cling to inside of the telescope’s front cell or dew shield
    , then tighten the thumbscrews. Suitable for use with telescopes with inter diameters ranging from 92mm to 130mm
    , the max inter diameter is 130mm
    . Outside The Dew Tube
    Place the brass screw on the outside of the the dew tube. Slide each of the three grip pegs inward until they clamp outside of the telescope’s front cell or dew shield
    , then tighten the thumbscrews. Suitable for use with telescopes with outer diameters ranging from 80mm to 118mm
    , the min outer diameter is 80mm
    . FOCUS ON A STAR FIRST, THEN MOVE THE TELESCOPE TO THE PLANET FOR IMAGING A “live view” image is best if your camera or software permits it, because then you’ll be able to see the results of your focus adjustments in real time, and the focusing process will be faster . If needed, though, you can take successive still exposures and review each exposure on the screen , tweaking the telescope’s focus slightly after each exposure, then taking another one. In either case, you’ll want to “ zoom in ” as needed so you can get a clear view of the spike pattern , in particular, the center spike’s position relative to the other two spikes that form the “X” . DSLRs often have two or more magnification settings for live view focusing, and capture programs used with a laptop often allow subframe viewing, which magnifies the image . As you turn your telescope’s focus knobs to move in and out of focus , you should see that center spike move to one side and the other of the X . Make fine adjustments of the focus until the center spike lands exactly in the center of the X , that is, it bisects the X. Then you’re in focus! USING THE FOCUSING MASK TO FOCUS With the mask in place over the front of your telescope and your camera attached to the scope and turned on, center a bright star in the field of view . You should see the diffraction spike pattern on the camera’s LCD screen (for DSLRs) or on your laptop computer running your preferred image capture software (see above figure) . If the scope is grossly out of focus you may see the grid pattern of the mask, in which case you should adjust the scope’s focus to shrink down the grid pattern until it turns into a dot with spikes . Once focus is achieved , remove the focusing mask. Then you’re all set to photograph any object at infinity focus . Read more
    Make sure the mask is centered on the front of the scope
    Adjust the pegs so that each is at roughly the same position in its slot. To ensure a tight grip, loosen one thumbscrew slightly, then push the grip peg inward while pulling the mask gently toward the loosened grip peg. This will make sure that the other two grip pegs are contacting the telescope when you retighten the third thumbscrew. Now the mask should be well secured in position over the front of the telescope. You’re ready to focus! Read more

  • Shipping and Handling

  • Please allow 5-7 business days for the package to arrive, regardless of buyer location within the US.

  • We will provide an online tracking number to you once the item has been shipped.

  • It may take a few business days for our automated system to process the tracking number onto Pricetronic. However, this will not affect the shipping times.

  • Return Policy
  • All our products are brand new and sealed. All items qualify for returns within 30 days of receipt.

  • Feedback

  • We take our reputation seriously. If you have any questions or concerns, please contact us and we will respond back to your message within 24 hours.
  • Returns Accepted for this item if it's within 30 Days

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