Choose the Right Mask Size
The Spike-a mask fits over the end of your telescope. In order for the mask to fit properly, you must order the proper size. Measure the outside diameter of your telescope where the mask will be attached, then order the next larger size. The Spike-a's nylon thumbscrews are adjustable up to 1". For example: If the outside diameter of your telescope is 11½ inches, order the 12 inch version of the mask.
Email us your specifications for your custom mask. The actual cost of the mask may be slightly more or less than what we initially charge on our website. We will get you a firm quote prior to building your mask. Custom masks are non-returnable.