Originally Posted by
thimblehouse
The brightness can be adjusted by using a variable aperature back sight on the diopter.
I now have a variable Iris fitted and coloured filters to the rearsight along with an Iris on the foresight - I must admit that this combination is a vast improvement on the original sights - for my eyes anyway.
I am getting used to the dioptre sights now and intend to keep perservering although I still cannot stop myself from flipping back and forth from focussing on the target then back to the foresight - I must learn to concentrate more 
Great fun this Bell Target innit.
Life without happiness is no life at all.
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