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Messages - neuroanatomist

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7441
Lenses / Re: UV filters (any difference?)
« on: March 03, 2013, 11:32:14 PM »
You do not need UV filter because the Canon L lens already got UV inside the lens. All you need is the best clear protector filter like B+W clear MRC protector filters to protect your expensive lens.
Where did you get that piece of information?

The sensor in a current dSLR is effectively insensitive to UV light (I've empirically tested this with a 7D and 5DII, an appropriate light source with UV/Vis emission, and a set of narrow bandpass filters).  Therefore, for a dSLR there is no difference between using a clear filter and a UV filter. My advice is to get whichever is cheaper and/or more readily available for you.

7442
EOS Bodies / Re: How do I set button to use only center AF point?
« on: March 03, 2013, 08:20:15 PM »
Your 6D has something the Rebel lacked - an AF-ON button. That's normally used for back-button AF.  Go into Custom Controls (apologies if the 6D doesn't have that, but I'm pretty sure it does), set the shutter button to metering start, and the AF-ON button to metering+AF start.

7443
Lenses / Re: UV filters (any difference?)
« on: March 03, 2013, 08:17:18 PM »
Get the B+W XS-Pro mount. It's a slim filter, but still has front threads so the regular lens cap fits.

7444
Lenses / Re: UV filters (any difference?)
« on: March 03, 2013, 07:27:07 PM »
A cheap filter will negatively impact your sharpness, and add flare.  A good filter will not reduce sharpness, and will only very slightly increase flare.  I'd go with B+W MRC (or Nano) or a high end Hoya.  Skipping the filter is better than a cheap one (but your 17-40 needs one to complete the sealing).

7445
EOS Bodies - For Stills / Re: Amazon vs B&H for purchase?
« on: March 03, 2013, 05:37:31 PM »
Congrats!

Doesn't really matter (as long as you're buying direct from Amazon, not a 3rd party even if fulfilled by Amazon). 

7446
Lighting / Re: Super DIY Remote Speedlites
« on: March 02, 2013, 04:52:32 PM »
Makes sense - thanks!

7447
Lighting / Re: Super DIY Remote Speedlites
« on: March 02, 2013, 04:01:32 PM »
I don't understand - how is the volume potentiometer going to control the flash output?

7448
EOS Bodies / Re: On the 5DM3 what is the difference
« on: March 02, 2013, 02:03:21 PM »
When you look through the view finder, the array of focus points is a matrix of small squares.  But each of those small squares also has an even smaller square in the center of it.  When using Single Point AF, you are using the larger, outer square for that point.  When using Single Point Spot AF, you are using the tiny square in the center of each focus point.

Just to be clear, with Spot AF the actual AF point is still slightly larger than outer square.  The area being used for AF isn't nearly as small as the little inner box, that 'double' box is just the indication that Spot AF is being used.

7449
EOS Bodies / Re: On the 5DM3 what is the difference
« on: March 02, 2013, 12:31:57 PM »
Spot AF reduces the effective size of the AF point. With single point 'regular' AF, the actual AF point is quite a bit bigger than the little box in the VF (basically, the real points on the AF sensor almost touch).  Spot AF restricts the AF point size to only very slightly larger than the little box that represents it in the VF. Spot AF is useful for macro shooting, I also use it with small birds in thickets. It's bad for moving subjects.

On the 5DIII, spot metering is always in the center (only 1-series bodies can link spot metering to the selected AF point).

7450
Lenses / Re: Canon 100-400 f/4-5.6L IS II Leaked!!
« on: March 02, 2013, 06:54:03 AM »
Sorry, but the attempt is pretty lame.  If you're going to put up a fake 100-400, your fake should show focal length markings somewhere.  No numbers around the zoom ring?  More importantly, you're showing a non-extending zoom and it's too short to be 400mm (unless it's a DO lens, in which case you've got the wrong color stripe).  Better luck next time.

7451
Software & Accessories / Re: Good GND filter to go with new Lee system
« on: March 01, 2013, 09:35:36 PM »
The 4x6" Lee (100x150mm), the 150x170mm are too big for the holder. That's the right S-R, though.

7452
Software & Accessories / Re: Good GND filter to go with new Lee system
« on: March 01, 2013, 08:08:54 PM »
NA, any suggestions for a soft 3 stop then? I like the idea of Glass of course, resin is find too I guess.

Personally, I plan to get a 4" CPL and 3-stop grad hard and soft from Lee, and a 3-stop reverse grad from Singh-Ray.

7453
Where does that anywhere say a petal hood blocks light better? That picture shows that using a hood helps. Which it does. The ET-60 will give you exactly that protection against flare.

+1

The point is that you should use a hood.  Importantly, you should use a hood designed for the lens.  In some cases (usually zooms with a wide angle or ultrawide zooms), that's a petal hood. In other cases (standard and longer primes, most telezooms especially 'slow' ones), it's a not petal-shaped.  The folks who design the optical formula of the lens also design the hood for optimal light blocking without vignetting, sometimes with practical compromises (like where possible avoiding rounded edges which result in a lens falling over if set down on the front of the hood).

7454
EOS Bodies - For Stills / Re: Obama using Canon!
« on: March 01, 2013, 12:09:47 PM »
Ok, I was just hoping....

Hoping what?  That the President is under an NDA with Canon and is testing a 35L MkII?   :-X

7455
EOS Bodies - For Stills / Re: Obama using Canon!
« on: March 01, 2013, 12:00:31 PM »
Looks like a 35L, as you suggested.

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