On Aug 27, 2006, at 1:25 AM, Kostas Kavoussanakis wrote: >> Any lens hood is a compromise on a zoom lens at some point or >> another. A tulip shaped hood gives a little more coverage than a >> barrel shaped hood, but only in a four-pronged shape that has edges >> which must be oriented correctly or you get vignetting. And it's >> harder to fit a hood cap with a more complex lens hood shape. > > Sorry, I need to process your statement a bit: are you saying that a > tulip hood in principle gives more protection than a barrel hood but > is harder to design, so results in reality vary?
Yes. The degree of extra protection is often compromised by a less- than-efficient design to the point that it's a toss up between a short but effective at shorter focal length settings hood and a tulip shaped hood that does a slightly better job at longer focal lengths. I find that tulip shaped hoods tend to be a lot less convenient in use so usually just fit a decent short standard hood for good flare protection with short focal lengths and make do with a shorter than optimal hood at longer focal lengths. Of course, I'm only using one zoom lens at this point (the 20-35) so a standard hood works with reasonable effectiveness across the board. Godfrey -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net
