Dears:

Thanks to the Internet and all your great and hard work to Optiboard forum ,we can learn and discuss about eyecare and lens with professionals all over the world !

With the great passion and strong desire to learn more about lens I start to go through all the posts relative about lens discussion on this forum.I really learn much from these valuable posts! In order to move forward on my learning path about lens, especially get more extensive, in-depth and systematic knowledge about lens, I am writing this post ask for some learning advice

So in order to get extensive, in-depth and systematic and knowledge about lens
is there any great books ,good website, good blog or any other learning resources you'd like to recommend?
Any great resource links you'd like to share?


Yes,When go through the forum to learn more about Lens, fortunately I find post mentioned that Tony have build
lensguru.com. But the Lesguru.com website seems down right now which means I can not get more from that website!So I write this post looking for any advice!

Thanks for any reply!