Some weeks ago I bought a Boss Screen Ground Glass. Us$156.95 in B&H. Waste of m oney. The instruction paper says:"The wax/paraffine layer is susceptible of temp erature and will melt above 50 Celsius. Bubbles will appear in the screen." Don' t believe on it. Not more than 35 Celsius was enough to many small bubbles appea r. So, LF fellows, if you are planning to make a trip to Greenland or Ushuaia, b uy the Boss Screen, made in Netherlands, specially designed for these conditions , and enjoy the so called focus advantage.
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