Quote:
Originally Posted by gregbradley
I've had a lot of experience with silicone. Its actually a very strong adhesive and tough. Horrible stuff really. Has the ability to get on everything.
That seems like a crude way of mounting a secondary - cheap and nasty. No wonder it causes problems.
Greg.
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Silicone is horrifc on mirrors. I experimented with the damned stuff in the 90s on a full thickness 10" Mirror. The deformation was horrific.
Back decades ago cheap small Newtonains used a single vane spider for the secondary, often little more than a bit of bent piano wire. The manufacturers used a blob of Araldite to hold the secondary. That was bad enough.
Any manufacturer in this day and age using Silicone anywhere near a mirror is simply cutting corners IMHO. I for one would never buy a telescope that was using silicone anywhere near the optical train, regardless of manufacturer.