Optec

Currently some products are out of stock due to COVID delays in manufacturing and supply chains. Unfortunately, we cannot predict delivery times and have many thousands of customers, which we cannot inform individually when a product is available. Therefore we have developed two automatic tools which we would like to ask you to use:
1st Newsletter:
If you enter your email address here, you will receive a monthly newsletter with a lot of information about our products and new releases
https://www.baader-planetarium.com/en/newsletter/
2nd "Notification Tool"
On the page of items that are currently not available, there is a field "Notify me when the product is available".
If you enter your email address there you will be informed as soon as the product is in stock.

Yes, by setting the screws not too tight, you have a slipping clutch. You can also replace one of the screws with a thumb screw (it is a M5 thread, if I remember correctly).

Sorry, we don't sell "Astrozap". Do you maybe mean our AstroSolar Safety Film? In that case the answer is yes, thats the same material.
As for finding the correct Baader Solar Filter: please check out our filter finder tool: https://www.astrosolar.com/baader-solar-filter

Only our Narrowband filters have the mark since a few years. The LRGB filters do not need this mark because it doesn´t matter in wich direction the both surfaces get built in the beam