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Astromania Bahtinov Mask Focusing Mask for Telescopes - FM160mm for a tube outer diameter (OD) from 175mm-220mm - can be mounted with the brass screws inside or outside the drawtubeSize:For Outer Diameter from 175mm-220mm 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.Whether you’re doing planetary
visual observing, planetary imaging,or deep sky imaging, the Bahtinov Mask is
a great accessory to get the best focus for your telescope quickly and
easily.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.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.There is a myth about different Bahtinov grating
pattern is required for different focal length telescopes. There is no real
practical reason for the use of special patterns for different telescope types
and focal lengths. In fact, the frequency and angle of Bahtinov mask patterns
aren’t really that important. The diffraction effect is so sensitive to
changes in focus, that the results are excellent regardless. 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.PaymentShippingReturnsPaymentShippingReturns

 

We accept payment by any of the following methods:

 

PayPal

 

Please pay as soon as possible after winning an auction, as that will allow us to post your item to you sooner!

SHIPPING TO THE UNITED STATES:

We offer FREE shipping on all orders to standard addresses in the continental US.

Your order will normally be shipped within one working day of receiving payment (Monday-Friday) and in most cases you should expect to receive it one or two days after shipping.

There will be an additional shipping fee for orders placed to APO addresses, Hawaii, Alaska, Puerto Rico, and other US Protectorates and Remote US Addresses. To see if this item is eligible for shipping to your address and to get a shipping quote, please go to the Shipping section of the listing. You can also get a quote at checkout. 

Not all of our items are available for shipping to all locations. 

Orders shipped to APO addresses, Hawaii, Alaska, Puerto Rico, and other US Protectorates and Remote US Addresses will take longer to ship and arrive than orders shipped to the continental US. We appreciate your patience.
​​​​​​​
SHIPPING INTERNATIONALLY:

There will be an additional shipping fee for orders shipped internationally. To see if this item is eligible for shipping to your address and to get a shipping quote, please go to the Shipping section of the listing. You can also get a quote at checkout. 

Not all of our items are available for shipping to all locations. 

International customers are responsible for all customs, import tax and/or VAT fees. Please check with your local customs authority to determine what the fee will be prior to purchasing an item.

For customers in the United States, if you are not 100% satisfied with your purchase, WE will provide a FREE return label for you to return the item within 30 days of the purchase date.

Any product you return must be in the same condition you received it and in the original packaging. Please keep the receipt.

Click here to see description Astromania Bahtinov Mask Focusing Mask for Telescopes - FM160mm for a tube outer diameter (OD) from 175mm-220mm - can be mounted with the brass screws inside or outside the drawtubeSize:For Outer Diameter from 175mm-220mm 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.Whether you’re doing planetary
visual observing, planetary imaging,or deep sky imaging, the Bahtinov Mask is
a great accessory to get the best focus for your telescope quickly and
easily.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.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.There is a myth about different Bahtinov grating
pattern is required for different focal length telescopes. There is no real
practical reason for the use of special patterns for different telescope types
and focal lengths. In fact, the frequency and angle of Bahtinov mask patterns
aren’t really that important. The diffraction effect is so sensitive to
changes in focus, that the results are excellent regardless. 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.Payment

 

We accept payment by any of the following methods:

 

PayPal

 

Please pay as soon as possible after winning an auction, as that will allow us to post your item to you sooner!

Shipping

SHIPPING TO THE UNITED STATES:

We offer FREE shipping on all orders to standard addresses in the continental US.

Your order will normally be shipped within one working day of receiving payment (Monday-Friday) and in most cases you should expect to receive it one or two days after shipping.

There will be an additional shipping fee for orders placed to APO addresses, Hawaii, Alaska, Puerto Rico, and other US Protectorates and Remote US Addresses. To see if this item is eligible for shipping to your address and to get a shipping quote, please go to the Shipping section of the listing. You can also get a quote at checkout. 

Not all of our items are available for shipping to all locations. 

Orders shipped to APO addresses, Hawaii, Alaska, Puerto Rico, and other US Protectorates and Remote US Addresses will take longer to ship and arrive than orders shipped to the continental US. We appreciate your patience.
​​​​​​​
SHIPPING INTERNATIONALLY:

There will be an additional shipping fee for orders shipped internationally. To see if this item is eligible for shipping to your address and to get a shipping quote, please go to the Shipping section of the listing. You can also get a quote at checkout. 

Not all of our items are available for shipping to all locations. 

International customers are responsible for all customs, import tax and/or VAT fees. Please check with your local customs authority to determine what the fee will be prior to purchasing an item.

Returns

For customers in the United States, if you are not 100% satisfied with your purchase, WE will provide a FREE return label for you to return the item within 30 days of the purchase date.

Any product you return must be in the same condition you received it and in the original packaging. Please keep the receipt.

Filed under: Eyepieces & Accessories