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Messages - neuroanatomist

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EOS Bodies - For Stills / Re: 6D accessories?
« on: May 24, 2013, 10:42:30 AM »
My solution is to use Arca Swiss type plates on body and lenses with tripod collars.  I use Blackrapid straps, with a Kirk 1" clamp on the end, so I can easily connect it to body or lens, or remove it for tripod/monopod use.
Is this the Kirk clamp you use ?

Having not used Arca Swiss type plates before they do not look suitable for holding the camera upside down on a strap. The sliding that you have on the plate I thought would mean if not really tightened would work its way off the camera?

That's the one.  The clamp has good intrinsic resistance - it doesn't open up on it's own or with a casual brush against something, you've got to grab the knob and apply some force to loosen it.  I attach it with the knob under the lens with a body plate, and away from my body with a lens plate, so nothing will brush it anyway.  In 1.5 years of use, I've never had the clamp loosen up even slightly on it's own. 

Honestly, I'm getting lost when I see some people posting sharp pictures with the 2x III - 70-200 2.8 L II combo.  :o
Please don't tell me Canon gave me a bad copy of their extender...

The combo should less sharp than the bare 70-200 II, but still quite sharp.

Example with the 5DII:

EOS 5D Mark II, EF 70-200mm f/2.8L II IS USM + EF 2x II Extender @ 260mm, 1/250 s, f/5.6, ISO 400

Example with the 7D:

EOS 7D, EF 70-200mm f/2.8L II IS USM + EF 2x II Extender @ 400mm, 1/160 s, f/5.6, ISO 3200

If your not getting sharp images, the first question I'd ask is if you've done an autofocus microadjustment.  Do note that the AFMA needs to be done separately for the lens + TC combo.

Lenses / Re: Replacement foot for 500Mk 1
« on: May 23, 2013, 11:04:07 PM »
RRS or Kirk.  Make sure you have a good, long hex key and pull hard, use an extender (short length of pipe) if needed.

EOS Bodies - For Stills / Re: what to do
« on: May 23, 2013, 10:09:24 PM »
i have a 500d and im thinking of  upgrading to a new body  but should  i buy  new glass instead

Neither. Get an underwater housing. 

Of course, I'm just guessing that's your most pressing need, based on the information you provided.   ::)

EOS Bodies - For Stills / Re: 6D accessories?
« on: May 23, 2013, 10:06:01 PM »
Neuro, thanks for your suggestions.  What is the largest lens you have mounted, when using your "pro holster"?  I assume it's not from spider.

Sorry for the confusion - I was referring to the Spider Pro holster (to distinguish it from their less robust 'black widow' setup).  I routinely hang a large white zoom from it (70-200/2.8L IS II, 28-300L or 100-400L) with the 1D X. 

I have no plans to try hanging the 600 II from it.  ;)

Haha, no problem...and sorry for the confusion on my end also, because the "Pro Spider Holster" is indeed the one I have.  You're saying you mount it to the tripod clamp on the lens.  I would too if I had the f/2.8 zoom.  But what if the lens is heavy but can't use a tripod clamp (such as the 135L, or similar)?  Also, I've read bad things about the clamp for my 70-200 f/4 (non-IS), so I didn't buy it (probably also why it doesn't come with the lens).  It also seems like it would get in the way when hand-holding this particular 70-200, unless the clamp is turned to stick up toward the top of the camera...but then it's hanging backwards and might be less balanced on the holster...

I use it with the 85L with no issues, and I don't find it to be an issue with the 70-200/2.8. But, the Spider Arca clamp does get a little in the way of the zoom ring for the 24-70 II, for example.  Not a big deal, the convenience of the holster outweighs that, for me.

6201 the 5D Mark III the metering bias is too high.

I wonder how all the people clamoring for the 5DIII to have AF-point linked spot metering would feel about that observation?   ;)

EOS Bodies - For Stills / Re: !
« on: May 23, 2013, 04:08:35 PM »
Ask a silly question, expect a silly answer.

Walk about with top end professional kit and expect that people will think you know how to use it.  Or read.


Shame/embarrassment gets my vote.  Before his idea that the gear was the problem was shot down by cold, hard evidence, he had no problem blaming Canon and emphasizing it was NOT his fault.

To be fair, though, it seems a call to Canon service didn't help his problem. Sadly, that's not too surprising.


Flipping the switch triggers metering. Since evaluative metering invokes code that looks at multiple metering points and tries to intelligently guess what to do, it's somewhat reasonable to assume that it might a different decision on what to do each time it's invoked if the light entering the lens in non-uniform across the image.

A way to test if this is happening is to point the camera so the image is completely uniform in brightness across the image — at the sky, or a flatly coloured wall, etc.

This makes perfect sense. Evaluative metering is linked to the selected AF point. Switching to MF deactivates all of the AF points, which means evaluative metering can no longer be weighted toward a selected point.  The fact that you're seeing this only with a wide angle lens is not unreasonable.  With such a wide FLV, there's more in the scene to affect the metering when it is no longer weighted toward the selected point. 

One way to test this would be simply to change the metering mode to center weighted average, spot, or partial. Doing any of those should eliminate the change with the switch in focusing mode.

I may get distracted by purchasing the EF 70-300mm f/4-5.6L IS II along the way...
It seems to me that with the rave reviews the current model gets (and the fact it was introduced as recently as 2010) this may not be one released very soon.

No thought that it was - typo corrected.  I'm just so used to typing IS II, I guess...

Just to confirm - everything else is the same with the physical setup?  Remember that it's not just what's in front of the camera that matters - light entering through the VF also affects metering so if you're in a different position behind the camera, that can make a difference.  Try covering the VF during testing (a lens cap hung over the eyecup does the trick).

Since Live View metering is done using the image sensor rather than the metering sensor, might be good to see if the same phenomenon occurs in live view.

EOS Bodies - For Stills / Re: 1DX and 5D3 RAW files
« on: May 23, 2013, 11:55:14 AM »
He likes to shoot everything in "program" mode

Isn't that how everyone uses their 1D X?   :o

Lenses / Re: Do you wish your 70-200L were black?
« on: May 23, 2013, 11:49:53 AM »
Ooooh - champagne gold.  I bet if they came out with a limited edition of these, they could sell for almost twice the price and people would buy them.

I think they sort of tried that with the Jackie Chan 550D...

The lens I'm currently coveting is the EF 300mm f/2.8L IS II.  I may get distracted by purchasing the EF 70-300mm f/4-5.6L IS II along the way...

None. (Although a Canon EF-S 30mm f/1.8 L USM would be nice, provided it is sans IS.)

According to a recent poll, the 14-24L is the most coveted lens here on CR

Not that it matters much, but I got the sense that the OP was interested in lenses that actually exist. 

EOS Bodies - For Stills / Re: 1DX and 5D3 RAW files
« on: May 23, 2013, 11:44:37 AM »
So why even discuss the low ISO capability, especially if all the independent tests indicate that higher ISO is where the 1DX really shines, and was obviously meant to be used?

Why?  Because that's Mikael/ankorwatt's hobby horse that he likes to ride into every thread that he visits.   ::)

But he was absolutely correct in stating,

no , they have not the same sensor, there are different regarding CFA  ,  FWC , QE and read out noise

Hey, you use 'F' as an abbreviation your way, I'll use it mine, ok?   ;D 

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