Astromania FM200mm Bahtinov Mask for a Tube (OD) from 215mm-260mm - Bundle with - 1.25" / 2" Twist-Lock Adapter

You know the situation - you've clamped your precious eyepiece using the locking screw on the focuser. But instead of sitting precisely in place, it is tilted or even worse - the screw marks and damages the barrel. But this doesn't need to happen, there is a solution: the Twist-Lock adapter. Put your 1.25" eyepieces or other accessories one: Turn the lock-ring and your eyepiece now sits firmly anchored in place. Your eyepiece no longer needs its safety groove as the adapter now clamps it over a large area of around 15mm. You can also use the 2 "to 1.25" adapter as a permanent 2" barrel for example. Suppose you are observing with some 2" eyepieces but also have a favourite 1.25" eyepiece you want to use. Instead of constantly having to fiddle around with adapters, you could simply use this adapter together with the eyepiece and use it with a fixed 2" barrel.Save money when buying filters - A 2" filter thread offers the option of using a 2" screwed filter, even when using a 1.25" eyepiece.

• This is a very high quality anodized aluminum adapter; self-centring 2 inch to 1.25 inch adapter with 2 inch thread
• Allows you to use 1.25 inch eyepieces in any 2 inch telescopes focuser star diagonal or holder; one twist and your accessories sit firmly in place; gentle clamping over a large area
• Ideal for using high-power; low focal length 1.25 inch eyepieces in a big 2 inch telescope focuser
• Bahtinov masks take the guesswork out of focusing and even get over the seeing conditions as it is a mathematical type approach to the task; the best focus for your telescope quickly and easily
• Suitable for use on all types of telescope; they are made from precision laser cut enforced plexiglass that is stiff and long lasting; they will never be brittle in the cold; unlike some other masks which are made from normal plastics