//www.youtube.com/watch?v=SwH_7FGtzb0
Author:AstroOnBudget
Aluminum Alloy Bahtinov Focusing Mask
Note :
1.When you buy it , you need to check your out-diameter of the tube .Not just the Objective lens diameter .Becasie you need to put the item one the tube.
2.if you don’t know which size should to choose you can ask me before buy it , Thanks
3.The size is not the diameter of the item, pls check the measurement way .
Your telescope is 80mm , but you need to know that the telescpe tube diameter must be bigger then the 80mm , so at least you need to choose the 85-120mm .
Features:
1.The Bahtinov Mask Made of aluminum alloy, not plastic. And it has whole anodizing aluminium process
2.Masks now feature 3 holes which can be attached with 3 screws to prevent the mask from falling all the way to the ground
3.Perfect focusing for your CCD, DSLR or Webcam in seconds
4.Light weight so you wont upset the balance on your scope
5.Suitable for telescopes front end diameter 85mm to 120mm/105mm to 150mm/150mm to 200mm/ 65mm to 100mm/175-220mm Universal adaptation, 3 bolts with plastic cover allow the mask to be simply attached to any telescope
6.Aluminium alloy material thickness: 1 mm
7.Color: Black
★65-100mm
★85-120mm
★105-150mm
★150-200mm
★175-220mm
With 3 adjustable screws
Masks now feature 3 holes which can be attached with 3 screws to prevent the mask from falling all the way to the ground
Aluminium alloy material thickness: 1 mm
Very thin and light weight so you wont upset the balance on your scope
How to use it?
1. Place the Bahtinov Focus-Mask over the end of your telescope; then locate a bright star near your target; take a 3-5 second picture and view the diffraction spikes
2. Change your focus; take another picture and again; view your diffraction spikes. Is the center spike moving further from center?
3. Then change the direction your focusing and try another picture. Watch the direction the spikes are moving and when the center spike passes the middle of the other two spikes; change direction and fine tune your tuning knobs until the center spike is in the middle; Your now in perfect focus
Buyers Show
How much does shipping cost?
We are glad to bring our customers great value and service. That’s why we provide fast shipping from our Fulfillment Center in California by UPS and USPS.
What countries are you delivering to?
As of now, we’re delivering to the United States only.
How can I track my parcel?
Once your parcel has left our Fulfillment Center, you will receive an email with a tracking number to monitor your parcel movements.
Can you ship my order to a business address?
Yes, you can write your business address in your order details if it’s more convenient to you.
Can you ship my order to a PO Box address?
Yes, you can select delivery to a PO Box if it’s more convenient to you.
Can you ship my order to APO or FPO military addresses?
Yes, we ship anywhere in the United States, and to all US territories and military APO/FPO addresses.
What happens to my parcel if it is delivered while I’m not there?
Depending on the destination and the package size, your parcel will be left in your mailbox or on your porch, or it may be left with a neighbour.
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