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Messages - neuroanatomist

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8311
EOS Bodies / Re: 1dx Japan site
« on: June 20, 2012, 02:49:20 AM »
To me, the removal of the date and the above statement add up to, "Currently shipping in limited quantities."

8312
Most of the time you take your photos with the rubber cover on the connectors anyway. But if you have a remote plugged it it can be trouble.

I have not seen any issues with photos shot using a B+W 10 stop ND in broad daylight - obviously using a cable release due to the long exposure.

Of course you don't see a problem. Go back and take the shot again, only this time put the lens cap in front of that 10-stop ND filter.  :P

FWIW, I have also taken cable-release shots with a 10-stop ND on my 5DII (and 7D) with no evidence of a light leak.

8313
Lenses / Re: Lens Recomendation for Niagra Falls
« on: June 19, 2012, 09:21:00 PM »
Often, wide-wide-wide = boring-boring-boring.  You stand in a spot with a great, wide vista, and you look around and are inspired.  You take a shot with an ultrawide lens to try and capture that vista, and the resulting shot utterly fails to capture your feeling as you viewed the scene, and instead looks flat and uninteresting.

Why?  As tntwit stated, an ultrawide AoV renders even moderately distant subjects tiny and apparently more distant. For an ultrawide shot to have visual impact, you almost always need an interesting foreground element - and with a UWA lens, 'foreground' means within a few feet of the lens. Also, that subject needs to be something that works with the perspective distortion inherent in that situation (usually not a person, as most people don't find exaggeration of their nose/belly/hips to be very flattering). 

There's a good reason the shot you complemented was taken at a short tele focal length.  Not trying to dissuade you from a UWA lens, just saying composing a successful shot with such a lens takes thought and practice - and might be difficult when the most common foreground element you'll run across is a guard rail.

8314
Lenses / Re: Ultra-Wide options for APS-C Body
« on: June 19, 2012, 01:40:36 PM »
The Canon 10-22mm, Tokina 11-16mm, and Sigma 8-16mm are all optically very good.

8315
EOS Bodies / Re: Canon T4i seems to be in stock everywhere -- WHY????
« on: June 18, 2012, 09:50:14 PM »
I call that a psychological warfare.

...aka marketing.

8316
Software & Accessories / Re: Filters for 16-35mm f/2.8L?
« on: June 18, 2012, 08:27:35 PM »
FWIW, for the regular (non-grad) ND filters, I prefer the convenience of round screw-in filters.  I use a B+W 77mm 10-stop and an 82mm Schneider Optics 10-stop.

8317
Lenses / Re: Lens Recomendation for Niagra Falls
« on: June 18, 2012, 07:08:16 PM »
Well...it might, just might, be a good idea for you to tell us what lenses you already have, 'eh?

8318
Canon General / Re: Canon Launches Mixed Reality System
« on: June 18, 2012, 06:16:11 PM »
Great. So...they can design a new product with fewer cycles of physical prototypes.  Wonderful.  Except...that doesn't seem to be the bottleneck.  The 1D X was announced in final design form 8 months ago, and still isn't available.  The lag from design lock and announcement was even longer for the new 500/600 supertele lenses.  Unless Canon's new mixed reality system can alleviate production bottlenecks, it seems like a solution wandering around in search of a problem.

8319
EOS Bodies - For Stills / Re: 5DMKIII Autofocus help required
« on: June 18, 2012, 06:09:34 PM »
  I think the 5D Mark III can do spot metering everywhere (all 61 points) in single shot mode can't it?  I can't remember.  AI Servo is different.
I was wondering about this. Sure it has the 61 point AF, and I can select any of those points, but is the one I select
also used for metering? In the book it says something about a central area about 1.5% of the total area for spot.
So who knows this for certain?
Cheers Brian

If you're using evaluative metering, weighting is given to the region around the selected AF point.  Spot metering on the 5DIII is in the center only, not linked to the AF point selected.  AF point-linked spot metering is currently a 1-series only feature.

Is that possible with a firmware update on the 5DIII??

In theory, yes. Might be a slight technical challenge due to the very tightly-packed 61 AF points, but previous 1-series bodies managed it with pretty tightly-packed 39 AF points and the same 63-zone metering found in the 5DIII.  But, practically...based on Canon's history, I really doubt it'll happen.

8320
EOS Bodies - For Stills / Re: 5DMKIII Autofocus help required
« on: June 18, 2012, 03:00:52 PM »
  I think the 5D Mark III can do spot metering everywhere (all 61 points) in single shot mode can't it?  I can't remember.  AI Servo is different.
I was wondering about this. Sure it has the 61 point AF, and I can select any of those points, but is the one I select
also used for metering? In the book it says something about a central area about 1.5% of the total area for spot.
So who knows this for certain?
Cheers Brian

If you're using evaluative metering, weighting is given to the region around the selected AF point.  Spot metering on the 5DIII is in the center only, not linked to the AF point selected.  AF point-linked spot metering is currently a 1-series only feature.

8321
Lenses / Re: First L Lens or upgrade, looking for advice
« on: June 18, 2012, 01:30:44 PM »
...a wedding is not as easy as simply capturing a few key moments.

C'mon - how hard can it be?  Just set the camera to 'P' mode (that stands for 'Pro' right?) and click away...   ::)

8322
EOS Bodies - For Stills / Re: When to get a used 5d2?
« on: June 18, 2012, 12:47:45 PM »
A very common seller behavior is to start with the price they paid for the item, then mark it down a bit (maybe 20%) and that's the price they list.  The 'problem' (for them, that is) is that the 5DII is still available new, and the price of the new 5DII has dropped relative to what they paid.

Personally, I plan to sell my 5DII after my 1D X arrives, and I know I'll have to drop the price pretty low, even with the grip.  But I also feel like I've gotten great use from it, and I have no plans to keep it as I see no need to have three bodies on hand.

8323
EOS Bodies - For Stills / Re: 5D2 vs 5D3 low light AF
« on: June 18, 2012, 11:32:39 AM »
One other thing to add to the discussion is remember the lens matters too.  Max ap lenses of f/4, f/2.8, f/1.2, etc. tend to focus faster, especially on the 1D Mk IV than narrower max ap lenses.  Consider the 300mm f/4L lens on the 1DX vs. the 300mm f/2.8L on the same camera body.  The latter will focus faster.

True, but it's not necessarily about the aperture of the lens, per se - it's more about the AF motor in the lens and the design of the focusing group.  The 85mm f/1.2L II, despite having the fastest aperture currently available, is a very slow focusing lens.  The 400/5.6 focuses noticeably faster than the 100-400mm f/4.5-5.6 @ 400mm f/5.6, although the aperture is the same.  In the example you mention, AF is faster with the 300/2.8 because of lens design, not aperture.  In fact, the high-precision AF point(s) activated by an f/2.8 lens may sometimes be slower to AF than the f/5.6 points, depending on the camera and the scene - the greater accuracy comes at the expense of focusing speed, such that AI Servo calculations are often driven by the f/5.6 sensor elements, and in some cases the f/5.6 part of the sensor first achieves focus, which is then refined by the f/2.8 part of the sensor (i.e. with a slower lens, the AF would be done after the f/5.6 step).

8324
Lenses / Re: 40mm/2.8 looks better than both 50/1.8 and 50/1.4
« on: June 17, 2012, 08:46:27 PM »
Of course you can compare the lenses wide open.  Wide open is where sharpness is at it's worst, for all lenses.  Comparing the 50/1.8 stopped down to the max aperture of a slower lens is the sort of thing that gives rise to statements like, "The $100 50/1.8 is a better lens than the $13K 800/5.6, just look at them both at f/5.6."

But certainly, as I stated, MTF50 is just one criterion that contributes to image quality. It's worth noting that the 40/2.8 also has rounded aperture blades for better bokeh.

8325
Lenses / Re: 40mm/2.8 looks better than both 50/1.8 and 50/1.4
« on: June 17, 2012, 08:12:18 PM »
hello mr apple meet mr orange  ::)

now pop up the mtfs of the 50 1.4 and the 50 1.8 @ f2.8 ;)

You need to get out of the orchard and head to school - MTF-101 is the class you need to take.  :P

The 40/2.8 is better wide open (which is a relative measure). Comparing one lens wide open at f/2.8 to faster lenses stopped down to f/2.8 would, indeed, be comparing apples to oranges - that's why we also compare at f/8.  The 40/2.8 is better at f/8 (which is as close as you're going to get to an absolute measure in this case).  Therefore, the 40/2.8 delivers better sharpness based on MTF50. Granted - that says nothing about color, bokeh, flare, etc. 

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