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Messages - neuroanatomist

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What about noise when shooting with HTP=on? Does it mean when I shooting at iso1600 it's in fact iso 800 in term of noise? I have always set HTP on, because results look better for me. Some people claims 7D is too noisy but I happy with iso 1600...

Not exactly - pushing the exposure increases noise, meaning with HTP you get a differential increase in shadow noise in the image.

Similar to primary issue. Picture style affects movie, am I right? There is no way to change it easily, right? So it's a good idea to have neutral style for still and some colorful for movie.

True.  You can also download a Technicolor CineStyle picture style for shooting video.

The only one that directly affects RAW is Long Exposure NR, since that takes a dark frame after the exposure and subtracts that from the RAW file before writing it to the card.  Note that with Canon, when you set Long Exp NR to off, it really is off (with Nikon, it isn't at least on some models, and there is a median blur filter applied as well, google 'Nikon Mode 3 NR').

The other setting that 'sort of' affects the RAW file is Highlight Tone Priority.  This doesn't really modify the RAW data, only the metadata.  The camera uses an ISO that's 1 stop less than selected (which is why ISO 100 is unavailable with HTP on), i.e if you select ISO 400, the camera is exposing at ISO 200 (but reporting ISO 400 in the metadata), then it applies a selective tone curve to boost the signal but preserve the highlights.  DPP and other RAW converters recognize the HTP flag in the metadata - DPP will apply Canon's tone curve during conversion, other converters will apply their versions. but some converters don't recognize the flag and will just show you an underexposed image.

Do note that NR, color, contrast, saturation, etc., including those settings as applied by a Picture Style, can indirectly affect a RAW image.  For a RAW image, the camera generates a JPG preview image that's embedded in the RAW file.  That JPG preview is generated using the in-camera settings (picture style, ALO, etc.) even when shooting RAW, it's what is shown on the LCD review, and it's used to generate the histogram.  That means if you use the histogram or 'blinkies' (blown highlight alert) to judge exposure, you may expose incorrectly, and that obviously affects the RAW image.  You may want to use the Neutral picture style to get a closer approximation of how the RAW file will look, as a basis for the histogram and highlight alert.

EOS Bodies - For Stills / Re: Canon EOS-1D X Firmware 1.0.6
« on: August 28, 2012, 12:49:37 PM »
Sorry to keep asking questions but I really would hate to mess this up.

If Canon says the file is 33.04 MB then that should calculate to 33,812,480 bytes (33.04 X 1024).  The extracted FIR file that I have downloaded is 32,988,060 bytes according to the "properties" function. 

I confess I am not a computer person but it sounds like my file is not complete.  Any help appreciated.

Mine says 33 MB on disk (32,988,060 bytes).  You're fine, just go for it. 

BTW, your math is wrong, you need two factors of 1024: bytes to kilobytes then kilobytes to megabytes (meaning 32,988,060 bytes = 31.46 MB), but also hard drives have a minimum block size that means files take up more room than their actual size, and that minimum block size increases with larger drives, and is dependent on the OS.

Why do I wear two pair of nitrile gloves in the lab?
Do the manufacturers explicitly support this?


Why do you want to buy a screen protector for the screen protector?

Why do I wear two pair of nitrile gloves in the lab?

EOS Bodies / Re: 5d Mk III dilemma
« on: August 27, 2012, 06:22:55 AM »
I would not expect Canon to bundle the 24-70 II.  Retailers might do so on their own, of course.

Lenses / Re: Help! used lens problem...
« on: August 26, 2012, 08:37:59 PM »
Likely nothing to worry about.  Roger Cicala (lensrentals.com) did done tests, and it takes a pretty big (1/4" square) piece of tape right on the rear element to have any effect.

EOS Bodies - For Stills / Re: Focus issues - a different analysis
« on: August 26, 2012, 07:02:59 PM »
Live View AF is the gold standard. If the VF manual focus gives a different result, it's either your eyes, or you didn't set the diopter properly.

Lenses / Re: Question regarding lenses for a safari
« on: August 26, 2012, 01:56:49 PM »
I'd go with the 100-400 - you need all the focal length you can get sometimes, but the versatility of a zoom really helps.  A wide-ultrawide too - depending on where you go, sometimes the animals get close. In Ngorongoro crater, lions walk right up to the Land Rovers.  Consider renting a 500/4 II (and bring a solid monopod if you do).

EOS Bodies - For Stills / Re: Speeding up 1DX foc lock... Any tips?
« on: August 26, 2012, 09:12:07 AM »
Manually select a single point (not Spot AF), try to find a region of high contrast to focus on.

1.4x TC slows AF by 50%, 2x TC slows AF by 75%.

400/5.6 + 1.4x will give better IQ than 300/4 + 2x.

IS on 300/4 is 2-stops, works with TC, so at 600mm with 2 stop IS you'd need a 1/125 s shutter at least.

Not normal.  No matter what my VF display settings, powering off the camera shuts off the transmissive LCD, leaving only the spot metering circle (which is etched on the focus screen. 

I'd call Canon.

How do you respond...

"Hey, that's a cute kid, you must have an attractive spouse."   ;)

Lenses / Re: Walk-Around Lens For Canon 1DX Camera
« on: August 25, 2012, 08:14:10 AM »
35L, because you can usually get closer and always crop, but frequently you cannot back up.

Lenses / Re: 500mm f4 mk1 and extender 2 or 3?
« on: August 24, 2012, 07:52:35 PM »
Assuming you meant slower, the MkIII TC delivers faster and more precise AF, but that's only with the MkII supertele lenses, not the originals.

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