Square or Round?
Feb 1, 2024 11:47:13 #
R.G. wrote:
To do an optimum job of keeping unwanted light away from the lens opening, the hood needs to stay just out of sight (i.e. not appearing on the sensor). Geometry and optics dictate the shape of the "petals". In the case of a zoom lens it's the widest zoom (the shortest focal length) that dictates the shape of the hood.
There you go...the correct answer.
Feb 1, 2024 13:47:26 #
It’s really a matter of efficient storage. Most lenses come with lens hoods that either store on the lens by reversing or retracting. In either case round takes up less space. And the reason for the tulip shape has all like ready been covered, smallest option to get required coverage on wider lenses.
Feb 1, 2024 18:49:27 #
User ID wrote:
. . .Cant imagine what an OEM hood must cost. Maybe it would be round, and longer ? I only use old leica lenses cuz theyre small, not cuz theyre great (mostly myth). IOW this tiny hood is a great find vs OEM. Lucky me !
. . .Cant imagine what an OEM hood must cost. Maybe it would be round, and longer ? I only use old leica lenses cuz theyre small, not cuz theyre great (mostly myth). IOW this tiny hood is a great find vs OEM. Lucky me !
If it works for you, it is a great find.
My 135 mm tele elmar came with the reversible round sunshade and the matching plastic cap (which also fits the reversible sunshade on my 50).
I paid $125 for the lot. No idea what the sunshade ( part 12575) would sell for by itself, but that stupid plastic cover I’ve seen on eBay for over $50, and no cheap clones on the market.
It appears the round sunshades were made to be stored around the lenses, particularly the longer lenses. In the reversed orientation the combination fits well in the usual hard leather cases. Rectangular shades don’t do that as nicely.
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