Title
Star Testing Astronomical Telescopes: A Manual For Optical Evaluation And Adjustment
Delivery time: 8-12 business days (International)
Many Observers Harbor Misgivings About Their Telescope. The Manufacturer May Have Guaranteed Accuracy To Onequarter Wavelength Or As Diffractionlimited But Most Telescope Users Have, At Best, Only A Hazy Idea Of How To Personally Verifying Such Claims. Sure, There Are Ways To Check The Accuracy Of Individual Components But For Many They Are Hard To Understand Or Require Costly Reference Optics And Other Test Equipment. Besides, Telescope Users Are Interested In The Performance Of The Entire Optical Train, Not Just The Main Optical Element. What Is Really Needed Is A Test That Can Be Used At The Observing Site, So That All The Problems That Impact On A Telescope'S Performance Can Be Diagnosed. Isn'T There A Simpler And More Complete Way Than The Complicated Shop Tests? Yes, The Star Test Is Such A Method. It Uses The Entire Working Telescope. It Isnot A Poor Substitute Or A Workaround That Uses Bits And Pieces Of The Optical System. It Is The Oldest And Most Sensitive Of The Optical Tests An Inspection Of The Diffraction Image Itself. Startest Results Apply To The Complete Imaging Performance Of The Telescope. The Star Test Is Lightningfast And Requires Only A Good Highpower Eyepiece. It Tests The Telescope For Precisely What It Was Meant To Do. Bad Or Poorlyaligned Instruments Fail The Star Test Unambiguously. The Star Test Often Allows You To Correct The Optical Difficulty Immediately In The Field, When You Might Be Frantic T
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Shipping & Returns
Shipping
We ship your order within 2–3 business days for USA deliveries and 5–8 business days for international shipments. Once your package has been dispatched from our warehouse, you'll receive an email confirmation with a tracking number, allowing you to track the status of your delivery.
Returns
To facilitate a smooth return process, a Return Authorization (RA) Number is required for all returns. Returns without a valid RA number will be declined and may incur additional fees. You can request an RA number within 15 days of the original delivery date. For more details, please refer to our Return & Refund Policy page.
Shipping & Returns
Shipping
We ship your order within 2–3 business days for USA deliveries and 5–8 business days for international shipments. Once your package has been dispatched from our warehouse, you'll receive an email confirmation with a tracking number, allowing you to track the status of your delivery.
Returns
To facilitate a smooth return process, a Return Authorization (RA) Number is required for all returns. Returns without a valid RA number will be declined and may incur additional fees. You can request an RA number within 15 days of the original delivery date. For more details, please refer to our Return & Refund Policy page.
Warranty
We provide a 2-year limited warranty, from the date of purchase for all our products.
If you believe you have received a defective product, or are experiencing any problems with your product, please contact us.
This warranty strictly does not cover damages that arose from negligence, misuse, wear and tear, or not in accordance with product instructions (dropping the product, etc.).
Warranty
We provide a 2-year limited warranty, from the date of purchase for all our products.
If you believe you have received a defective product, or are experiencing any problems with your product, please contact us.
This warranty strictly does not cover damages that arose from negligence, misuse, wear and tear, or not in accordance with product instructions (dropping the product, etc.).
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Visa, MasterCard, American Express, Paypal, Shopify Payments, Shop Pay and more.
Secure Payment
Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.
We accept payments with :
Visa, MasterCard, American Express, Paypal, Shopify Payments, Shop Pay and more.