BirdForum is the net's largest birding community dedicated to wild birds and birding, and is absolutely FREE!

Register for an account to take part in lively discussions in the forum, post your pictures in the gallery and more.

Reply to thread

Message: <blockquote data-quote="kabsetz" data-source="post: 3116234" data-attributes="member: 10167">Ed,Some measurements that pertain to the eyepieces and eyeglass (un)friendliness of the Canon 10x42. My eye-relief measurements come from the eyecup rim, not the lens surface, since you cannot push your glasses beyond the rim anyway. ER Canon = 13 mm, ER Swaro 8x42 SLC HD = 16 mm, ER Swaro 10x50 SV = 16 mm. ER Canon with eyecup rubber removed = 15 mm. You can achieve this if you remove the rubbers and put rings of thin adhesive felt around the eye lens.Diameter of eye lens (gives an idea of subjective FOV/ER): Canon = 23 mm, SLC HD 8x42 = 23 mm, ELSV 10x50 = 24 mm.Diameter of eyecup: Canon 44 mm, SLC HD 8x42 38 mm, ELSV 10x50 40 mm. The diameter of the Canon cup is truly huge, and since the very edge of the rim is the most elevated, some curved eyeglass lenses will sink in them a bit.Eyecup extension/ click stops: Canon 6, 9, 11 mm out from fully in, SLC HD 8x42 = 8, 12 mm, ELSV 10x50 = 3, 9, 13 mm.Closest focusing distance, with my far-sighted eyes: Canon 2.6 m, SLC HD 8x42 1,9 m, ELSV 10x50 2,8 m.I'm thinking of doing a thorough test of the 10x42 IS L that I just bought, since the original test I've written was on one from the first year of production. Thus far, resolution measurements show the new one to essentially equal the 10x50 ELSV both in centerfield sharpness, sweet spot size and off axis resolution all the way to the edge.Kimmo</blockquote>