Actually, I bought two. One for a CEGM II with the 8" OTA, and one for an Alt/Az single arm with a 6" aboard. Being in southern Arizona - warm and dry most of he year and having both rigs on movable platforms - allows me to leave them outdoors almost year round. Wind and blowing dust would be the major problems to avoid, and the covers do a great

job. Got to stretch a bit to get the bigger on on, but they are well worth the effort and expense.

It arrived ready to use. Even the solar finder was setup and adjusted perfectly. I've only had 3 sunny days to use it so far so I have more to learn to fine tune it. Attached are an image and a time lapse video.

Superb quality, nice smooth adjustments, with tight fine movement, just absolutely perfect! It's more expensive than others in this size, but the quality makes it worth the price. The other popular brand of this size wedge breaks easily, as reported by several members of my group, even causing damage to their telescope. I am super confident this w

edge will never fail to hold and protect my scope.

ONE OBSERVATION THOUGH:
Some of the images on this site, as well as the manufacturer's, shows indexes labeled "latitude". This may NOT be correct. My wedge was not labeled as such and when I set my latitude, it was obviously not right, being a long way off. Then I remembered my other wedge uses "inclination", not latitude. Once I set the inclination, my polar alignment was perfectly spot on for elevation! That's a credit to the accuracy of the indexes.

To find the needed inclination (the physical angle of the telescope in relation to the ground), subtract you latitude from 90 degrees.
(Inclination = 90 - your latitude)

Btw, I think some older William Optics wedges may have indexed the wedge with latitude. I think this one is a newer version because there are some other slight differences with the images. But I absolutely love this wedge! Well worth the three fold cost over the other brand.

I used this in combination with the Apertura 2" Photo & Visual Coma Corrector for Newtonian Telescopes. I used this Spacer to push back the focus so that I could use a 31mm 82 degree eyepiece on a Apertura AD8 Dobsonian F/6. The field was flat and coma free.

Tough material and so convenient. Makes the tripod easy to carry and stays dry.

This filter does not fit the Explore Scientific AR-152 refractor. The dew shield on the scope is exactly 204mm in diameter and the outside of the filter is the exact same size.