Welding Glass - What shade level

I've a grade 9 and a grade 10 from that Darkmutton bloke on fleabay - the grade 9 comes out at around 11 stops, and the 10 is nearer 14 stops. I've been using a thin "sausage" of blu-tack to fix it to a cokin adaptor ring, which worked pretty well, though obviously precludes using any other filters (eg ND Grads for the sky)
 
I agree with TBY. The 9 has been the most useful for me too. I use it with a manual Tamron 28mm lens as this has a very wide lip I can put a sausage of bluetac around too attach the glass.
 
Hi Jon, you can get some from here but the P&P pushes the price up if you are only buying 1 lens so best to get a few and some spares as postage is the expensive part. They do all grades not just 9.10 &11's.
Linky
 
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