White Balance Lens Cap

I picked up a real cheapy thing from ebay, it's like that but uses a screw on attachment to the filter threads then clips on top, and the translucent part is across the entire objective. I've used it once, and it seemed to work ok, but I tend to adjust the WB in RAW processing more than use a custom one in shooting.
 
There is a thread on these somewhere - I remember posting samples.

For £3 or whatever they cost now, I'd recommend one.
 
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