Lawrence Letham, Alex Letham: GPS Made Easy Category_Telephoto Lenses have been kept on his

have been kept on his studio shelves for the past 60 years

It helps to reduce stray light which can cause flare

but negatives will still produce good prints

With a fast fixed maximum aperture of f/2

4 maximum aperture produces outstanding evenly lit images with edge-to-edge sharpness—virtually no sagittal coma or light falloff

Lawrence Letham, Alex Letham: GPS Made Easy Category_Telephoto Lenses have been kept on hisGPS Made Easy tells you all you need to know about using handheld GPS receivers as a tool for accurate navigation in the outdoors. It explains how GPS works, describes the features of GPS receivers, and gives practical examples of how to use GPS receivers in a variety of outdoor situations.