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Messages - neuroanatomist

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7981
Any left-handed photographer here to help explain the rationale behind this product?
I will admit I chuckled when I initially read this thread, for the reasons stated above - the shutter button is on the right, the camera is designed to be held in the right hand, so why would even a left-handed photographer need this?

I am a right-handed photographer, and I can tell you why I will likely get one of these left-handed straps.

I was out shooting in earnest for the first time a couple of days ago with my 1D X and my new EF 600mm f/4L IS II.  I have the RRS replacement foot on it, for an Arca-Swiss connection to my gimbal and monopod, but also to connect the Kirk 1" clamp on the end of my BR RS-4 strap.  However, when using a lens that large, you need to support the weight by the tripod foot while shooting handheld, and ideally lift the camera to your eye by the tripod foot as well, rather than by the camera body (which would place all of that weight on the lens mount - there's a reason Canon puts strap lugs on the lens barrel!).  So, when carrying a supertele on the Blackrapid, IMO it's best to have it hanging on the left side of your body, so you can use your left hand to raise it to your eye by the tripod foot and support it while shooting with your right hand.

7982
EOS Bodies - For Stills / Re: Problem with dynamic range!!
« on: October 06, 2012, 12:13:54 PM »
Yep.  Should use manual mode, ignore the meter when taking the shot, just set exposure to the spot meter reading for the ground (since that's the un-filtered part).  It's a good idea to take a few spot readings of top and bottom of the scene, and average them if necessary.

7983
EOS Bodies - For Stills / Re: Problem with dynamic range!!
« on: October 06, 2012, 11:55:39 AM »
What metering mode were you using to check sky vs. ground?

7984
EOS Bodies - For Stills / Re: Problem with dynamic range!!
« on: October 06, 2012, 11:37:24 AM »
A grad ND?  How strong?  Perhaps not strong enough...  What's the exposure difference between sky and ground, vs. stops of filter.

7985
Software & Accessories / Re: Head for Manfrotto 055xprob
« on: October 06, 2012, 09:37:35 AM »
Question for the OP:  do you need/want to do stitched panoramas?  If so, you might consider a Really Right Stuff pano setup.  In RE shots, subjects are close so you need to rotate around the no-parallax point. RRS has nice single- and multi-row pano setups.

7986
I'd consider a Really Right Stuff Versa 2-series and a BH-40 head.

7987
Lenses / Re: 600mm Version I
« on: October 06, 2012, 01:41:26 AM »
I didn't realize the Nikon was so (relatively) new.  Still, it's the substantially lighter weight that, IMO, sets the Canon 600 II apart - it's the same weight as Nikon's 500/4 (and the 'old' Canon 500 MkI)

But alas the current 600mm is perpetually out of stock in most places so you may want to consider looking at other focal lengths to get to where you want.

Actually, I need look no further than my closet to find a 600 II.  ;)

7988
Lenses / Re: Angle of view calculations
« on: October 05, 2012, 07:41:09 PM »

7989
Lenses / Re: 600mm Version I
« on: October 05, 2012, 07:38:54 PM »
I did this so I know whether it is time already to buy the 600mm Version 2. In the event the 600mm Version 2 sells for between $9,200 and $10,300 (Nikkor price) then I will be more interested to complete my lens lineup.

Nikon's 600mm is still the old version I lens, which is very similar to Canon's MkI. Canon's MkII is optically better, and the Nikon I weighs 30% more.  Unlike the MkI versions of both, Canon's 600 II is actually handholdable.  To me, at least, that's worth a big premium.

7990
EOS Bodies - For Stills / Re: 6D Center Cross-Type ?
« on: October 05, 2012, 04:10:28 PM »
Neuro, don't you mean 'vertical' sensor line (for the 6D's centre AF point?)   ???

And am I correct in believing that AF points with vertical sensor lines pick up actual horizontal contrast in scenes easier, eg the actual horizon? (and visa versa, that horizontal sensor lines pick up vertical lines easier, eg the sides of buildings?


No, I mean a horizontal f/2.8 sensor line for the 6D center point. 



But yes, a horizontal sensor line is sensitive to vertical lines in the scene, like the side of a door frame or building (and vice versa).

When you wrote "It doesn't matter whether the lens has an f/2.8 or an f/1.0 max aperture, the AF system will be precise to that degree relative to the max aperture of the lens."... does that mean that the AF system will or will not have more precision with a f/1.0 lens than a f/2.8 lens?

I do understand lenses are held 'wide open' until they are actually stopped down when taking the photo [or when the depth of field preview button is used.]


Same relative precision, but in an absolute sense, an f/1.0 lens should be more precise. Honestly, I'm not absolutely certain of this myself - in this case, I'm basing this on an explicit statement from Chuck Westfall.

And finally, Neuro... can you define both precision and accuracy... comparing / contrasting the two?


Precision is repeatability, how tightly a series of repeated measurements cluster together.  Accuracy is how close the average of a repeated series of measurements, or even a single measurement for that matter, is to the true value.


7991
Speedlites, Printers, Accessories / Re: Lens case for 70-200 f/2.8 II
« on: October 05, 2012, 07:08:14 AM »
http://forums.dpreview.com/forums/post/36806538

The Lens Exchange 200AW is very overrated imho.


Thanks for sharing your opinion.  Assuming that as you indicate above ('imho'), it is your opinion, based on your personal experience Lens Exchange 200AW, and that you're not letting some forum poster form your opinion for you, like the internet version of a Jedi mind trick (because we know what sort of minds that works on, right?).

As for the review you linked, note that the person states at the end, "If you are using it strapped to your belt, this becomes a whole different story."  That's how I, personally, use my Lens Exchange 200AW - and it's great for that.  As for the differential padding, note that it's not called a lens case.  Also, my 70-200mm f/2.8L IS II w/ hood reversed slips down into the case just fine (and unlike the poster I also have a Wimberley P-20 plate on the tripod foot, and it still fits in the case fine).

7992
Lenses / Re: Canon 16-35mm II + Reikan FocCal Pro --- Tips
« on: October 04, 2012, 05:16:35 PM »
I don't think it matters to FoCal what type of lens, as long as it has AF.

7993
EOS Bodies / Re: Shutter count request to Canon.
« on: October 04, 2012, 12:08:33 PM »
Even the bottom end Rebel/xxxD bodies have a 50K durability rating, and I doubt many owners of those cameras come anywhere close to taking 50K shots over the lifetime of the camera.

... unless you use Magic Lantern's focus stacking and bracketing, that's like 20+ exposures per shot, if it's a hdr scene multiply that by 2+. That's why my 60d now nearly has 100k cycles :-\

Right.  But, do you think your usage patterns are representative of the general population?

7994
EOS Bodies - For Stills / Re: Once you go "L" you'll never go back....
« on: October 04, 2012, 12:06:45 PM »

"Once you go "L" you'll never go back.... " 

+1....it's hard to go back to non L. I really enjoy 24-70 II & 70-200 f2.8 IS II results. The only lens left in my bag that is not L is 50mm f1.4.  I'm thinking selling it and will get the 35mm L this coming x-mas.

I have a couple of non-L lenses - the 40mm f/2.8 pancake and the MP-E 65mm.  I have no real interest in any other non-L lenses...

7995
Lenses / Re: Canon Teleconverters Question
« on: October 04, 2012, 09:56:25 AM »
FWIW, reportedly the Kenko Teleplus PRO 300 DGX 2x AF Teleconverter allows AF at f/8 on the 1D X using the 600/4 II lens (2 stops EC required), and reportedly also works for f/8 AF on the 5DIII.

Unfortunately, unlike the Kenko 1.4x, the optics of the Kenko 2x suck, meaning the resulting in-focus image turns out to be a soft pile of mushy, well, you get the idea. 

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