Degree of polarization?

jurgenph wrote in post #10751383
do step down rings prevent you from using the lens hood? J.

It can - if your ring is a larger diameter than the end of the lens barrel where your threads or bayonet are located, then yes it will interfere with the attachment point for the lens hood.

I got a 71 -> 77 step up and also a 67 -> 77 and I can not use the supplied lens hood

Step up rings (you step up from a small lens diameter to a larger filter diameter) will. Many people find it difficult to turn their polarizing filters when they've got a hood on though, so they don't use a hood with a polarizer regardless.

Jon wrote in post #10751443
Step up rings (you step up from a small lens diameter to a larger filter diameter) will. Many people find it difficult to turn their polarizing filters when they've got a hood on though, so they don't use a hood with a polarizer regardless.

Got that right Jon. Fortunately the larger petal style hoods I have on my 17-40 and 24-105 have enought "finger space" to allow a certain amount of careful rotation. Still, I usually end up getting finger prints on the CPL. With the non petal hoods that have any depth at all, it's very challenging unless you have really long thin fingers.

I use the same technique with my 24-70, 70-200 and 100-400. But then I have a 77 mm polarizer for each of them . . .

Jon wrote in post #10751476
I use the same technique with my 24-70, 70-200 and 100-400. But then I have a 77 mm polarizer for each of them . . .

I've got a single 77mm that gets passed around between the 17-40, 24-105 and 70-200. I'm in good shape during the warm months. But come winter time, the gloves just don't cut it very well. So off they come until I start feeling the first signs of frostbite .

Jon wrote in post #10751443
Step up rings (you step up from a small lens diameter to a larger filter diameter) will. Many people find it difficult to turn their polarizing filters when they've got a hood on though, so they don't use a hood with a polarizer regardless.

heh, i looked at it from another perspective, stepping down from a bigger filter to a smaller lens

anyway, i still use the lens hood when i have the polarizer on, the lens hood comes off and goes back on pretty fast, only it's a minor inconvenience.


J.

jurgenph wrote in post #10751731
heh, i looked at it from another perspective, stepping down from a bigger filter to a smaller lens

anyway, i still use the lens hood when i have the polarizer on, the lens hood comes off and goes back on pretty fast, only it's a minor inconvenience.


J.

Try ordering one on that basis and it won't fit either the lens or the filter . . . :{)#

jurgenph wrote in post #10751383
do step down rings prevent you from using the lens hood?

yes. i bought a 77mm CPL for my 24mm, and a 72mm to 77mm step up ring to use it in conjunction with my other lenses. when it is mounted, the lens hoods cannot be fixed.

Jon wrote in post #10751443
Many people find it difficult to turn their polarizing filters when they've got a hood on though, so they don't use a hood with a polarizer regardless.

Even with the hood on, I can manage to turn the CPL on my 24-105. With just one finger on the turning ring, I can change the polarization. I'm using a B + W CPL, maybe it just turns more smoothly than some.

Not sure if anyone else does this, but I only rotate the filter the same direction as threading the filter on, it keeps me from un-threading the filter.

windpig wrote in post #10751882
Not sure if anyone else does this, but I only rotate the filter the same direction as threading the filter on, it keeps me from un-threading the filter.

That's an excellent suggestion windpig - we've heard a couple stories here of folks "depolarizing" their CPL off from the end of the lens.

sapearl wrote in post #10751937
That's an excellent suggestion windpig - we've heard a couple stories here of folks "depolarizing" their CPL off from the end of the lens.

yea.. if you suddenly gain two stops of light and you hear glass shattering.. you're doing it wrong.

alt4852 wrote in post #10751954
yea.. if you suddenly gain two stops of light and you hear glass shattering.. you're doing it wrong.

You mean the "Audible Instant Light Boost" function ?

alt4852 wrote in post #10751954
yea.. if you suddenly gain two stops of light and you hear glass shattering.. you're doing it wrong.

LOL - ouch!