Comments on: tfttf203 - Latour Afternoon - Voice message line 206-202-3757 (US) - www.tipsfromthetopfloor.com http://www.tipsfromthetopfloor.com/2007/06/08/tfttf203-latour-afternoon-voice-message-line-206-202-3757-us-wwwtipsfromthetopfloorcom/ Thu, 20 Nov 2008 09:33:18 +0000 http://wordpress.org/?v=2.3.3 By: David http://www.tipsfromthetopfloor.com/2007/06/08/tfttf203-latour-afternoon-voice-message-line-206-202-3757-us-wwwtipsfromthetopfloorcom/#comment-34650 David Mon, 18 Jun 2007 13:26:53 +0000 http://www.tipsfromthetopfloor.com/2007/06/08/tfttf203-latour-afternoon-voice-message-line-206-202-3757-us-wwwtipsfromthetopfloorcom/#comment-34650 A note on coatings: the anti-reflective coatings work at only a narrow range of wavelengths. You need a multi-coated filter to cover the visual range. These are 'quarter-wave coatings'. As a rule of thumb, uncoated glass costs you 3-4% per surface of EACH lens element; coated surfaces cost you only about 1%. A note on coatings: the anti-reflective coatings work at only a narrow range of wavelengths. You need a multi-coated filter to cover the visual range. These are ‘quarter-wave coatings’.

As a rule of thumb, uncoated glass costs you 3-4% per surface of EACH lens element; coated surfaces cost you only about 1%.

]]> By: Tom http://www.tipsfromthetopfloor.com/2007/06/08/tfttf203-latour-afternoon-voice-message-line-206-202-3757-us-wwwtipsfromthetopfloorcom/#comment-34423 Tom Thu, 14 Jun 2007 08:50:04 +0000 http://www.tipsfromthetopfloor.com/2007/06/08/tfttf203-latour-afternoon-voice-message-line-206-202-3757-us-wwwtipsfromthetopfloorcom/#comment-34423 I remembered another reason for using a UV filter......lenses like the Canon EF 17-40 L are not weather sealed until a filter is attached! I remembered another reason for using a UV filter……lenses like the Canon EF 17-40 L are not weather sealed until a filter is attached!

]]>