December 22, 2014, 04:35:41 AM

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Messages - Lawliet

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EOS Bodies - For Stills / Re: Vertical curtain velocity
« on: December 19, 2014, 10:34:36 AM »
We don't read out CMOS sensors in the dark when using them for video, so obviously that's not essential.  I'm pretty sure the real answer is that it's cheaper to toss a leaf shutter in than to do it right....  :)

That's where you get the rolling shutter artifacts. The shutter is required to get one image without much of a time component messing with it. Once you manage to read the sensor fast enough that stops being a problem, at least for usage w/o flash - but until then you need either a bucket brigade or as recently suggested an electrochrome layer.

EOS Bodies / Re: High Megapixel Camera Coming in 2015 [CR3]
« on: December 18, 2014, 11:56:36 PM »

A 50mp FF from Canon will have much better IQ than the 7D II. Pixel size is immaterial, sensor size and sensitivity (Q.E.) is what matters. On a normalized basis, such a camera should crush the 7D II in terms of IQ, because your averaging together all those tiny pixels to produce the same output resolution. That's the same as having bigger pixels.

That would be for a b/w image; in color the downsampling gives you higher chroma information density and a reduction of sampling artefacts for free. I.E. the higher resolution camera gets an additional headstart.

EOS Bodies / Re: High Megapixel Camera Coming in 2015 [CR3]
« on: December 18, 2014, 11:16:54 AM »
One thing is for sure: the day of the low light religion being the only measure are over. And I'm glad. Not everybody shoots in a dark closet with the lights off.
Back to "painting with light", less accidentellement objet trouvé...
Which brings the question, with the MP race doing one last push, will sony now head to extend their DR lead? I think as ISO and MP stop selling bodies, HDR single frame will.
One of the recent patents describes electrochromic shutters over each sensor cell - global shutter and switching between normal, phase detect with the option of telling each cell to be horizontally or vertically sensitive w/o reduction in full well capacity.

Third Party Manufacturers / Re: 40-50mm for a7r
« on: December 18, 2014, 09:38:20 AM »
The Samyang 35/1.4 would almost fit in the FL bracket and is as good as its counterparts that cost multiple times as much. (The same can be said about the 85/1.4, but that one is a bit far off in terms of perspective.)

EOS Bodies - For Stills / Re: Vertical curtain velocity
« on: December 17, 2014, 05:31:49 AM »
If yes, how fast the curtain could travel?
The fastest shutters travel at ~13m/s according to the respective documentations, to be found in Dynax/Maxxum/a9. Todays Nikons are slightly slower and a 5D is closer to 7m/s.

EOS Bodies / Re: Sony Sensors Coming to Canon DSLRs? [CR1]
« on: December 16, 2014, 10:42:17 PM »
That means that they would have to use DIGIC CPUs sensors with DPAF (CANON sensor tech). That means they can't be SONY.

Considering that phase detect on the imaging sensor is something just about every manufacturer does that's quite a bold statement.

EOS Bodies / Re: Sony Sensors Coming to Canon DSLRs? [CR1]
« on: December 16, 2014, 11:12:12 AM »
One shouldn't expect Dual Pixel sensors manufactured by Sony. No way.

Indeed - compared to it would be a step or two backwards.

PowerShot Cameras / Re: Canon to Target The GH4 With New DSLR Type? [CR2]
« on: December 15, 2014, 11:48:01 PM »

Yeah, but just to add... with regards to lighting... its a drag to lug around a generator all the time (if you are outside). And, if you're talking about battery LEDs... those sony batteries are expensive!

Those Dedolights run nicely off a car battery or its NiMH/ lithium(preferably iron phosphate) counterpart. And you get output on par with an ace in a package the size of a monolight. 8)

Lighting / Re: Speedlites - How many are enough?
« on: December 14, 2014, 07:49:02 PM »
indeed its lowest power setting, that won't overpower anything but the dimmest ambient, is only 1/10,000 sec and that doesn't make it any better than an Einstein at 1/13,000 sec at lowest power. The problem of fast high powered flash is as much flash discharge time as anything else.

Be careful with that equivalency - the Scoro/Move(/Siros S) still run in ectc, even in speed mode.
OTOH it's hard to find a trigger that's fast enough to get one of those packs to be the limiting factor.

For those who don't want to go the LS route there is at least a half way solution - the D8x0 in crop mode syncs almost as fast as the HBlad leaf shutters w/o introducing noticeable black bands.

Technical Support / Re: What photo printer do you use?
« on: December 14, 2014, 05:18:55 PM »

LOL...same problem. Mine is sitting on the wood floor, until I find a solution for it.

Don't put it on a table. Somewhere on the lower floors of a solid rack gives the printer less leverage to slowly work the furniture apart - and you retain some more office space as a side benefit.

EOS Bodies - For Video / Re: 1dc life span
« on: December 13, 2014, 11:43:33 PM »
What do you all think? Thanks for any suggestions.

First thing that comes to mind are Canons cine lenses. They cover S35, not 36x24mm.
I.E. a camera that supersedes the 1Dc would have to rely on (something like the) CZ2/CP2 series or compete against the usability of dedicated gear. Neither feels right for a high end product.

I'd rather ask what makes the 1Dc unique, what is it's UPS and how cost effective is it?

Third Party Manufacturers / Re: Review: Zeiss Otus 85mm f/1.4 Apo Planar T*
« on: December 13, 2014, 10:54:05 AM »
As opposed to the bokeh I get on my cheaper lenses which is very "computer pixelly"...Is that generally a sign of a quality lens?
Some lenses have their spherical aberrations(those causes fast lenses to appear soft and low contrast when used wide open) overcorrected. That makes the in focus areas appear extra sharp and gets them higher marks in the commonl tests, but the bokeh appear tends to busy or nervous. (Optical image stabilization can exacerbate the issue.)
Zeiss prefers the spot on approach.

Third Party Manufacturers / Re: Review: Zeiss Otus 85mm f/1.4 Apo Planar T*
« on: December 13, 2014, 03:28:20 AM »
Is the sensitivity of the focus confirmation system related to the type of screen used (which I thought only affected the subjective perception of depth of focus)?
Focus confirm is basically the same as PDAF, just w/o driving the motor to adjust focus. The screen doesn't affect it, it gives you only a better impression of the final image.
(The screen has an effect on exposure metering though, that's something to be kept in mind when pondering the thought of using ones that the camera isn't designed to take. Those 3rd party split screens come to mind.)

Photography Technique / Re: What can old-school photogs do better (or not)?
« on: December 12, 2014, 08:51:56 PM »
film brings back good memory's. yes so costly.

Asking film teams for the left overs was a way of getting a wide range of high quality stock for (almost) free!
(They'd discard that half spent roll rather then risk running out of material because of the unknown remaining length. Which still would translate in hundreds or thousands of frames.)

Lenses / Re: Advice about the Tamron 70-200mm f/2.8 Di VC USD
« on: December 12, 2014, 07:19:30 PM »
I'm not sure what to make of Bryan's results at 200mm.
Compare them to the f/3.2 results, That much change for a 1/3 stop makes me think of either a mistake, very specific sample problem or, if it where off center, something with the field flattening.

Personally I'd ignore the outlier, for 3D-subjects the Tamron is great ;D

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