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Messages - neuroanatomist

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EOS Bodies / Re: Canon 5d Mark III Shadow recovery
« on: April 07, 2013, 07:22:08 PM »
long story short
nice that you have seen what I have tried to explain about read noise and banding  since I started as a member here

Not really.......................................................

No one (at least, no one with a shred of objectivity) has denied that Sony/Nikon sensors have more DR than Canon sensors. But jrista is correct - the suggestion that DR at low ISO is the be-all-end-all of what matters for camera performance - for every photographer - is ludicrous and absurd.  Yet...that is exactly how the repeated Mikael/ankorwatt/etc. posts came off. That was the problem with the former persona, and I sincerely hope we don't go down that road again.

Software & Accessories / Re: Ballhead for a RRS TVC33
« on: April 07, 2013, 07:03:01 PM »
I have the BH-55 on my TVC-33, it's a great head.  Easily holds my 1D X and any lens (including my 600/4 II, although I use a PG-02 LLR gimbal for that). 

FWIW, it wasn't the last tripod I'll ever buy.  ;)  After getting that, I later got a RRS TQC-14 and BH-30 for travel.  But now I'm set.

Lenses / Re: Prime vs zoom
« on: April 07, 2013, 06:15:47 PM »
Since getting the 24-70 II, I haven't used the 35L... 

EOS Bodies / Re: Canon Announcements on April 23, 2013? [CR2]
« on: April 07, 2013, 04:04:37 PM »
What is Canon doing?

Nothing. What a joke of a company.

What is Canon doing?  Delivering value to their shareholders by consistently selling more cameras than their competitors.  If that trend continues, the innovations of other manufacturers may become irrelevant.

Lenses / Re: Prime vs zoom
« on: April 07, 2013, 02:45:24 PM »
The classical trinity is 35 / 50 / 85.

First time I've heard that. The 50/1.2L isn't old enough to be part of something called 'classic' and I hope you aren't suggesting the 50/1.0L was ever part of such a trilogy. No...the 'classic' trinity of primes is as stated above: 35L, 85L, and 135L.

Speedlites, Printers, Accessories / Re: straps
« on: April 06, 2013, 05:07:51 PM »
So if you have the black rapid attached to the 70-200 lens mount and then you want to use a monopod attached to the same lens mount do you just not use a strap when mounted on a monopod or would you use the camera mount in that circumstance?  Thanks

That's why I have the Kirk 1" clamp on the end of the BR strap - detach strap, attach monopod.

EOS Bodies / Re: Canon 5d Mark III Shadow recovery
« on: April 06, 2013, 04:50:10 PM »
Yourself and jrista are behaving like Nikon missionaries trying to spread your good word to the great unbelievers.


I should point out that some of us believe in DR (should I call it 'salvation' in this context?), but don't find the tradeoffs worthwhile.

Lenses / Re: Canon Cinema CN-E lenses compared to Canon EF
« on: April 06, 2013, 04:00:22 PM »
No need for them to deliver higher resolution - 4K video is less than 10 MP in terms of stills resolution.  The 11-bladed apertures (IIRC) might make for some nice bokeh...

Lenses / Re: Canon Cinema CN-E lenses compared to Canon EF
« on: April 06, 2013, 03:49:19 PM »
Most of what you're paying for is lack of focus breathing, accurately calibrated focus markings, excellent internal gearing, and standardized build/size and transmission across the line (e.g., so T/3.2 gives identical exposure with any cine lens).  In short, benefits for shooting a production film. 

What you want is a couple B800s. But if you can spring the extra $80 / head for the B1600s, you won't regret it.

Are you sure?  The B1600 has a 640 Ws max like the Einstein, but only a 6-stop (vs. the Einstein's 9-stop) range. The max power is great for overpowering the sun outdoors, but in a small indoor space like the OP is talking about, depending on modifiers used, the min power of the B1600 may be too much.  I often need to dial my Einstein down by 7-8 stops indoors (lower than the B1600 can be set). 

Another option is B1600s plus a 2- or 3-stop ND (assuming one doesn't want to stop down past f/22).

What does "∝" stand for? If it means "equal", then this depends on the units  (m, cm, ft) used. If means "proportional", then SQF depends on the constant.
The ∝ symbol is mathematical shorthand for 'is directly proportional to'. The full relationship (again, by convention) for viewing distance (d) and picture height (PH)  is: d = 30cm x √(PH /10).

I do agree that representing a complex optical system with a single number is over simplifying. Have you seen Bob Atkins' illustration of that concept?  He makes the point quite well with the analogy of representing an image as its average color:

At what distance, and what print size?

The convention for SQF is to render an arbitrary selection of distance and print size moot by relating them with viewing distance ∝ √(picture height).  Granted, there's no guarantee they're following convention...

well , it must be some errors

As far as I know, DxO tests just one copy of a lens.  Given Sigma's reputed less-than-stellar QC (not than Canon/Nikon are perfect, far from it). So, perhaps not errors on DxO's part, but rather copy variability as seen in Roger Cicala's testing of his rental stock.

P-Mpix is actually a computed number (well, MTF is computed as well but P-Mpix is computed from the MTF data). How is it computed - it is a well kept secret. Until they explain what it is, it is worthless.

SQF is one of the many attempts to represent the whole MTF curve by one number. It depends on a reference viewing size. As such, it is not better than, say, MTF-50.

I wouldn't say worthless - unlike their Sensor Score, which introduces bias with the method, nothing in the description of P-Mpix suggests it's other than a linear transform of SQF measurements.

I'd say SQF is not necessarily better than MTF50 as a single-number comparator, but perhaps more relevant/useful, in that the values more closely approximate how a viewer would rate picture sharpness (which isn't always the case for MTF50).

with a good lens, and there are many, high resolution will allways be better than less.

Of course. But the point of the DxOMark wasn't 'with a good lens' it was an average across a group of lenses. 

I do find it quite interesting that for some common lenses like the 'workhorse' 24-70 f/2.8, FF 'kit' 24-105/120 f/4, and 100/105 Macro, for sharpness the Canon lens on the 5DIII outperforms the respective Nikon lens on the D800.  The first two pairs are 'general purpose zooms' and are arguably some of the most commonly used lenses, the 3rd pair are the most common macro lenses. In those cases, with these common lenses, the D800 offers no resolution advantage over the 5DIII.

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