Commonly used for a noticeable increase in contrast with black and white films. Especially useful for clear contrast between blue sky with clouds and foreground. It is also suitable for landscapes and nature scenes. Lee resin filters are available in 4 x 4"" 100 x 100mm x 2mm thick. Filter factor is 2 1 stop
Price: £99.99 from Wex Photographic
Lee No 11 Yellow Green 100x100 Filter for Black and White
Lee No 12 Deep Yellow 100x100 Filter for Black and White
Lee No 15 Deep Yellow 100x100 Filter for Black and White