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Messages - neuroanatomist

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8866
EOS Bodies / Re: Who said Canon cameras suck?!?
« on: October 07, 2012, 05:28:05 PM »
I see a lot of defensive and insecure posts here.
I see a lot of Nikon fanboy troll posts, too. 

Just because 5D3I has DR of 11.3 and D800/600 have 14+, it doesn't mean you have to attack DxO and others.
Ok, I give up. You're right - DxO are technological geniuses, their Scores are the epitome of scientific analysis, the D800 does have 14.4 EV of real, measurable DR, and because of that DR, you were able to recover amazing shadow detail from a backlit shot - detail that revealed a winged pig flying over snowbanks in hell.

Whatever.

8867
... they are essentially charging what they believe the market will bear.

Which is what every successful business tries to do.  Why are we even having this discussion?

8868
Lenses / Re: Resolving ability of the lenses
« on: October 07, 2012, 02:40:26 PM »
Yes, but only for Zeiss lenses.  Zeiss actually tests their lenses with (very expensive) instrumentation that tests just the lens, without it being mounted to a camera.  Their published MTF curves are real, measured data from actual lenses, whereas everyone else's are theoretical MTF curves (generated in silico from a mathematical model of the lens design). 

The lens review sites (all of them) use a camera to test lenses, and as sensor resolution goes up, so do/will the reported MTF estimates.

But don't worry, we've got a long way to go before lenses become the main limitation on system resolution.

8869
Software & Accessories / Re: Needing a primer on batteries
« on: October 07, 2012, 01:21:53 PM »
Depends on the off-brand. Some are fine, others don't deliver the mAh capacity they claim, or fail prematurely, some cheap knock-offs lack safety circuitry.  You pays your money and you takes your chances...   ;)

8870
EOS Bodies / Re: 46mp sensor useless for landscape?
« on: October 07, 2012, 01:19:22 PM »
Ok, I think this is too technical for me. So 46 MP is same as 36 MP for landscap?

No, 46 MP is higher resolution than 36 MP, for any application.

8871
EOS Bodies - For Stills / Re: 5D3 Microfocus Adjustment
« on: October 07, 2012, 12:56:38 PM »
Correct - a simple integer linear regression between the two values across the focal range of the lens.  For the plot below (with the 1D X, but the 5DIII is the same) each lens was set to W = -10 and T = +10.


8872
EOS Bodies / Re: 46mp sensor useless for landscape?
« on: October 07, 2012, 11:52:30 AM »
The 5DII sensor is a bayer filter image sensor, 19mp is actually 6 mp, 3 pixels represent 1
False, 19 MP is actually 19 MP.  The Bayer mask provides color sensitivity (and requires interpolation) but the spatial resolution is unaffected.  Note, though, that when Foveon counts the three 'stacked' pixels separately, that's a misrepresentation - a '14 MP' Foveon has only 4.7 MP of real spatial resolution.
Correct, but for a specific color - red, blue or green(50% more than other 2 colors), the resolution is really less than 7mp on 5D Mark II. "14 MP" instead of "4.7 MP" is just for marketing, and the picture took by that sensor really shows fine micro details.

Sorry, still false. You're assuming that the colors in the mask are 'pure' RGB, but they aren't - there's substantial spectral overlap, such that photons of a given wavelength, except the very ends of the visible spectrum, are detected by photosites under at least two, and sometimes all three, colors.

Here's the response of the 500D sensor:


8873
EOS Bodies / Re: Is Canon EOS-1S the Name? [CR1]
« on: October 07, 2012, 11:12:49 AM »
Yep, 1DS III was $8000 at release and for the first few months.
Do you know how long it took before it took to come down a bit?  And do you remember what it came down to?

It came down pretty fast actually, because of the 5D Mark II.  I remember it retailing when the 5D2 was new for $6899, then $5999, then $4999, until the used prices went under $4k when there weren't any new ones anymore.

I don't ever remember seeing the 1DsIII retail new for $5K...


8874
EOS Bodies - For Stills / Re: The Unholy Trinity of Non-L Primes?
« on: October 07, 2012, 10:40:07 AM »
I've always heard photographers that praise a photographer for collecting either a 35/50/85 or 24/50/135 lens collection.
Point of order - the phrase 'holy trinity of primes' usually refers to the 35-85-135 combo.

8875
EOS Bodies / Re: 46mp sensor useless for landscape?
« on: October 07, 2012, 10:34:02 AM »
The 5DII sensor is a bayer filter image sensor, 19mp is actually 6 mp, 3 pixels represent 1

False, 19 MP is actually 19 MP.  The Bayer mask provides color sensitivity (and requires interpolation) but the spatial resolution is unaffected.  Note, though, that when Foveon counts the three 'stacked' pixels separately, that's a misrepresentation - a '14 MP' Foveon has only 4.7 MP of real spatial resolution.

8876
Canon EF Prime Lenses / Re: Canon EF 600mm f/4L IS II USM
« on: October 07, 2012, 08:22:31 AM »
The Wimberley replacement foot is really just a plate, and has no riser.  "Difficult to use as a handle?" I'd say close to impossible.  I just measured the extension of the collar where the foot mounts - it's 1/2" high, I can't see how I could wrap my hand around the Wimberley 'foot'.  I'd definitely recommend the RRS foot over the Wimberley. 

You could also go with the Canon foot and P-50 plate.  The combo won't extend as far back as the RRS foot, but the clamping surface on the Wimberley II is ~60mm long, whereas the RRS PG-02 LLR that I use has an 80mm clamp - the P-50 might not sit all the way back on the platform, but should be entirely within the clamp with most loads (perhaps not if you stack two TCs or mount a flash on the camera hotshoe).

8877
Canon EF Prime Lenses / Re: Canon EF 600mm f/4L IS II USM
« on: October 06, 2012, 11:09:37 PM »
Yes, but RRS may rethink that for the 500 II.  There's a note on their website about it not balancing properly on a gimbal when TCs and/or a heavy body are used. It's fine with the 600 II with the 2x and 1D X - that combo has the back of the foot flush with the LLR clamp on the gimbal.  With the 1.4x and 2x stacked, the back of the foot is ~8mm inside the clamp (still safe, according to RRS). 

Since the 600 II is longer and more front-heavy than the 500 II, I expect there might be an issue balancing that lens with a 2x and gripped body.

Interestingly, the RRS foot extends further back than the stock Canon foot or the Kirk replacement - those might be problematic on a gimbal.

8878
Canon EF Prime Lenses / Re: Canon EF 600mm f/4L IS II USM
« on: October 06, 2012, 10:56:40 PM »
Are you using a replacement lens foot with your 600?

Yes, the RRS LCF-53.

8879
EOS Bodies / Re: Is Canon EOS-1S the Name? [CR1]
« on: October 06, 2012, 10:43:48 PM »
Why in the heck would I sell the best sports/action camera in the world for something that isn't a sports/action camera?  What the heck are you thinking??

Well, not for sports.  But if a 1-series, it would very likely have the 1D X AF and metering, and the main sacrifice would a slower frame rate.  Wildlife photographers might be tempted to trade fps for pixels on target, being able to crop to the framing of the 7D and still have an 18 MP image would be nice.  I know I'd be tempted (but I'd not want to give up the ISO performance of the 1D X along with the fps).

8880
Lenses / Re: First Portrait Lens, Need Suggestions
« on: October 06, 2012, 10:37:12 PM »
Thanks!  I sure did like the colors of the of the 85 1.2.  I also hear great things about the 135L and it's color rendition.  Any thoughts?  Or perhaps too long on the crop camera?

I think 135mm is too long on APS-C for most portrait uses, but on FF it's a wonderful lens!

Here are a few shots at 85mm on APS-C, the first with the 85/1.8 and the second/third with the 85L.


Rebel T1i, EF 85mm f/1.8 USM, 1/2000 s, f/1.8, ISO 100


EOS 7D, EF 85mm f/1.2L II USM, 1/2000 s, f/1.6, ISO 100


EOS 7D, EF 85mm f/1.2L II USM, 1/1250 s, f/1.6, ISO 100

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