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Messages - neuroanatomist

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6196
PowerShot / Re: Comparable Camera to the Sony RX100
« on: February 18, 2013, 06:42:47 AM »
If 'pocketable' is included in your definition of comparable, the RX100 is it (personally, I don't find anything bigger to be really pocketable - I don't wear cargo pants and I don't always have a big coat on).  I have the Canon S100, it's a great little camera that at the time of its release had the largest sensor in that size class.  That crown now goes to the RX100 (by a wide margin), and if I needed to replace my S100, it would be with the Sony RX100.  If you're looking for a less expensive option, the S100 is a great choice - I don't see anything in the S100 that makes it a significant improvement (and it's an ergonomic step back, IMO), and there are good deals to be had on the S100.

6197
EOS Bodies / Re: 5D Black AF points...NOTHING + Spot-meter?
« on: February 17, 2013, 05:29:37 PM »
I shot a sporting event today with the machine-gun shutter of the 1D X, and it wasn't a problem.  I suppose that might be because the subjects were busy pummeling each other in the head within the boxing ring...   ;)

6198
EOS Bodies / Re: 5D Black AF points...NOTHING + Spot-meter?
« on: February 17, 2013, 04:48:55 PM »
As I wrote in this thread, if you look at Amazon.com's Top Rated dSLRs, the 5DIII is #1, the top 15 spots are Canon cameras, and the Nikon D800 doesn't even make the Top 100.  Pretty telling...

6199
EOS Bodies / Re: 5D Black AF points...NOTHING + Spot-meter?
« on: February 17, 2013, 02:13:31 PM »
I have no idea what market the D800 is targeting, since none of Nikon's lenses can even maximally use the 36 MP sensor.

The 5DII trounced the D700 in sales.  Nikon assumed it was due to 21 MP vs. 12 MP.  So, Nikon skated to where the puck used to be, and developed the 36 MP D800.  Canon listened to Wayne and skated to where the puck was going - they developed the 5DIII, which seems to be trouncing the D800 in sales.

6200
Software & Accessories / Re: BlackRapid & Kirk clamp hook-up
« on: February 16, 2013, 10:02:05 PM »
When using the Black Rapid Strap, remove the padded part of the Op/Tech strap (it just unclips) and I loop what remains through the BR strap as shown in this blog post:

http://blog.martinbaileyphotography.com/2011/05/29/podcast-288-camera-straps-and-safety-measures/

This hasn't saved my bacon yet but at some point it probably will.

BTW:  I don't agree with Martin's use fo the quick release clamp (and niether did teh guys at RRS).  I use a screw clamp in place of that.


I agree that a lever release clamp is not the right choice there.

Just to clarify, what he says in the blog is that the BR FastenR lug came unscrewed from the clamp (as I've noted, that happens when the lug is directly connected to a tripod socket).  That's not a risk for me - I use Loctite on the lug screw connection to the clamp.

6201
Vimeo can't be embedded here (YouTube can).  You can post a link to the Vimeo vid, though. Just manually add an s after http in the link.

6202
Software & Accessories / Re: BlackRapid & Kirk clamp hook-up
« on: February 16, 2013, 02:29:12 PM »
1) The screw knob on the clamp doesn't loosen on its own. It just doesn't. By positioning it so the knob is under the lens or away from your body, you avoid brushing against it (even that's unlikely to loosen it - when clamped down, it's tight).  It's really not a concern, I tighten it and forget it.  Note that the same cannot be said of the BR lug - that frequently came loose during use (before I switched to the AS plates and Kirk clamp w/ Loctite on the lug). 

2) The 1" clamp provides all the 'holding capacity' needed, even for a 1D X + 600mm f/4L IS II.  The only reason not to use the 1.75" clamp (or the new RRS 1.5" clamp with the flat bottom) is that the 1" clamp is less bulky. 

6203
Lenses / Re: UV or clear protection filter?
« on: February 16, 2013, 01:05:37 PM »
Out of curiosity, how did you perform your test?

My first test was just a 'quick and dirty' one - laying a B+W UV filter on a UV transilluminator (the kind used to visualize ethiduim bromide-stained DNA gels in the lab) and taking a picture (with no filter on the lens), to see if the UV filter blocked any of the light.  It didn't appear to, but the light tubes in a typical transilluminator emit a lot of visible blue light, too.

My second test was more specific. I used a mercury arc lamp (a bright 'white' light source for fluorescence microscopy) which has emission peaks at 254nm, 365nm, 405nm, and 436nm (and other peaks, too), and a set of 20nm bandpass filters centered on 250nm, 360nm, 405nm, and 435nm. The 250nm and 360nm filter images were black even with long exposures, the 405nm filter was very dim, and the 435nm filter was reasonably bright.

6204
PowerShot / Re: Fast AF Canon compact for under £100
« on: February 16, 2013, 12:39:21 PM »
Oh dear...   I've only gone and bought myself a EOS M !

But...but...you wanted fast AF?!?

6205
Lenses / Re: UV or clear protection filter?
« on: February 16, 2013, 11:20:06 AM »
No difference between clear and UV for a dSLR.  Well...I can't speak for all of them, but I can speak for the 7D and 5DII that I empirically tested with both short- and long-wave UV light sources - both were insensitive to UV.

6206
Lenses / Re: How to reduce the nd filter warm color cast?
« on: February 16, 2013, 08:02:10 AM »
Doesn't have to be IR.  if you look at the transmission curve for the B+W 3.0, it starts to rise from 'neutral' at about 630nm.

ok whatever you say but cinema guys I know all have full line up of hot mirror IR ND filter kits.
I guess they have spent thousands for nothing.

what do i know... live and learn

Ummm...ok.   :-\   My point was that it's important to know the transmission characteristics of your filter.  With a B+W 110 and an IR cut filter starting at 700nm, you've still got some increased transmission from 630-700nm. 

6207
Lenses / Re: How to reduce the nd filter warm color cast?
« on: February 16, 2013, 07:34:47 AM »
Doesn't have to be IR.  if you look at the transmission curve for the B+W 3.0, it starts to rise from 'neutral' at about 630nm.

6208
PowerShot / Re: Fast AF Canon compact for under £100
« on: February 16, 2013, 07:27:20 AM »
...are my expectations high due to using DSLR's for 4 years ?

Unless you usually use live view AF, probably...   CDAF is ssssllllooooowwwwwwww.

6209
Canon General / Re: Bag question
« on: February 15, 2013, 10:24:54 PM »
I've loaded the Flipside 400 AW with a gripped body, 430EX II, and either one big white zoom (70-200/2.8L IS II or 100-400L) and four black lenses (e.g. 24-105L, 16-35L II, TS-E 24L II, 100L Macro, 135L, etc.), or two big white zooms and three black lenses.
With room to spare, probably.

Maybe enough for a CF card or two...   :P

6210
Canon General / Re: Bag question
« on: February 15, 2013, 07:06:20 PM »
Hib belt great for stopping the bag swinging, terrible for screwing up your lower back, a chest strap is the way to go, weight over shoulders and chest.

Years of backpacking experience disagree - there's a reason backpacking packs have supportive hip belts. Obviously, you should do what's best for you, but the general recommendation is to have more weight on the hips than the shoulders. 

Granted, some hip belts on camera packs are useless - the Flipside 300 is in that category.  But the 400 AW has a decently supportive hip belt (although not as good the one on the Osprey internal frame pack I use for backpacking). 

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