Click here for more information and to buy from eBay.
TheBahtinov mask has become the preferred method of focusing a telescope, eithervisually or when imaging with a CCD camera, DSLR or webcam. They are an inexpensive tool which will allowyou to achieve pin-sharp levels of focus, saving you time and improving yourwork. Simply place the mask over the front of your scope, align the scopetowards a star. The mask displays a unique diffraction profile; one part of thediffraction pattern moves in response to changes in focus and displays error asa displacement from a clearly defined point.Whetheryoure doing planetary visual observing, planetary imaging, or deep skyimaging, the Bahtinov Mask is a great accessory to get the best focus for yourtelescope quickly and easily. Thesehigh quality Bahtinov masks are adjustable to fit a wide range of opticaltubes, unlike masks which are only able to fit one telescope. They have adjustmentlatitude of about 30-60mm, depending on model, in aperture making them veryversatile.They aremade 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 madefrom normal plastics.The masksgrip the telescope tube gently but firmly with three metal posts which havenon-scratching silicon sleeves to protect you valued telescope surface. Thisprevents slippage, whilst allowing the mask to remaining perfectly central.Because of this 3-post mounting, the mask remains centered, whilst fitting awider range of telescopes.There is a myth about different Bahtinov gratingpattern is required for different focal length telescopes. There is no real practical reason for the use ofspecial patterns for different telescope types and focal lengths. In fact, thefrequency and angle of Bahtinov mask patterns arent really that important. Thediffraction effect is so sensitive to changes in focus, that the results areexcellent regardless. Please be assured that these focusing masks will workexcellently for both reflectors andrefractors with whatever focal length. All you need to do is to measure yourtelescope tube size and choose the right size of the mask.The sale is for a Bahtinov mask that will fit a tube outerdiameter (OD) from 85mm-120mm.
Bid from 50P for a great bargain!Please also visit my ebay shop at https://stores.ebay.co.uk/Joys-Opticsfor more bargains! Delivery: UK buyers will pay 2.90 for P&P. The lens will be posted to you the same day by Royal Mail First Class Post when your payment is received before 13:00 O’clock. Otherwise, it will be posted the next day. Please note that all payment received over the weekend will be posted the following Monday. International Buyers please see postage details.
Buy from a UK PowerSeller with more than 30,000 happy customers and buy with TOTAL confidence!
Category: Cameras and Photography:Telescopes and Binoculars:Telescopes
Location: Guildford
Click here for more information and to buy from eBay.
See below for similar items.
See more from eBay…
Items 1 to 6 of 160975
Yale University Press: A Mask for Janus
£15.99 from Waterstones
A collection centered in myth, A Mask for Janus is the 49th volume of the Yale Series of Younger Poets While Merwins po…more
Mask£6.99 from WHSmith
Peter Bogdanovich directs this American biographical drama starring Eric Stoltz, Cher and Sam Elliott. Rocky Dennis (Sto…more
PrettyLittleThing: Garnier Depuffing Eye Mask With Bamboo Charcoal For Puffy Undereyes
£3.5 from PrettyLittleThing UK
Garnier Depuffing Eye Mask with Bamboo Charcoal – For Puffy Undereyes Visibily Depuffs & Revitalizes Eyes – For All Skin…more
PrettyLittleThing: Garnier Ultimate Blends Hair Mask for Dry 390 ml
£7 from PrettyLittleThing UK
Garnier Ultimate Blends Argan Richness haircare range with precious Moroccan Argan Oil & rich Almond Cream, for very dry…more
PrettyLittleThing: Garnier Ultimate Blends Hair Mask for Dry 390 ml, Clear
£7 from PrettyLittleThing UK
Garnier Ultimate Blends Argan Richness haircare range with precious Moroccan Argan Oil & rich Almond Cream, for very dry…more
Items 1 to 6 of 160975