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Messages - Lawliet

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16
Third Party Manufacturers / Re: Samyang/Rokinon Tease 135mm Lens
« on: December 27, 2014, 11:52:56 AM »
14mm is a very nice offering but based on my experience with that lens you still need AF for sensors with 18mp and above, no matter how much you may stop down the lens.

That's more a case of "if all you have a hammer". W/O focus peaking or at least a good ground glass the AF makes getting at least something in focus easier. But by it's very nature it is limited to a very small area, making no statement about the distribution of in/out of focus zones in the image - an emergency solution, not the ideal one.

17
EOS Bodies / Re: Canon Confirms Development of High Megapixel Camera
« on: December 26, 2014, 12:35:37 PM »
Many of Canon lenses would be good enough for a 100 MP FF sensor, at least at f/4.
Sure, if you settle for a 20+ PMP image. .

Thanks for demonstrating why rating lenses based on data that has been obtained via a setup with more then one variable is less then useless.

18
EOS Bodies / Re: Sony Sensors Coming to Canon DSLRs? [CR1]
« on: December 26, 2014, 11:35:32 AM »
Maybe I'm just naive, but who makes RED's sensors, and why doesn't Canon go to them over Sony?
Who doesn't really matter - provide proper design specs and every major foundry can make the sensor.
Making sure that the device your blueprint describes actually behaves the way you want is one part of the challenge. The other would involve not infringing anyone's patents, at least not without having enough bargaining chips to deal with that.

And then there is the "not invented here"-syndrome that makes sticking to the highly serial readout and old lines appealing.

19
EOS Bodies / Re: Canon Confirms Development of High Megapixel Camera
« on: December 26, 2014, 07:53:17 AM »
Can you apply this technique in macrophotography?
In theory: yes.
But you run into a myriad of problems as you have to account for factors that would simply vanish in landscape photography.
And then you also want to use focus stacking to actually gain from the larger sensor estate - let's hope your subjects are patient.

20
EOS Bodies / Re: Canon Confirms Development of High Megapixel Camera
« on: December 26, 2014, 07:35:25 AM »
...and even if he got lenses with the best IQ and Resolution he would run into diffraction at F4 or more.

Only if you had removed the color filters and limit yourself to BW. While conveniently forgetting about what MTF actually measures and how arbitrary thresholds are therefore.
It gets into involuntarily comedic territory when People consider Pixel densities lower then what's currently available impossibly high though.

21
EOS Bodies / Re: High Megapixel Camera Coming in 2015 [CR3]
« on: December 24, 2014, 07:37:51 PM »
They could stick to a7 and even more to a7R and that's it!

Only if the processors can handle reading all sensor cells at all desired frame rates and apply stable noise reduction algorithms in real time. Esp. the latter part is important - most NR isn't stable, that's fine for still images, but in a video that leads to artifacts that sometimes look ugly and approximately always mess with the video compression.

22
EOS Bodies / Re: Canon Confirms Development of High Megapixel Camera
« on: December 24, 2014, 07:28:13 PM »
Anyone else thinking of a high-resolution camera being medium format, and the new line of lenses being medium format adaptable for ef?

What would be the incentive for the majority of the MF users? Coming up with a complete system costs a lot, and you can't take shortcuts and expect to draw people out of their upgrade/trade-in cycles. To the contrary it would take extraordinary effort.
On the other hand products based on sensors smaller then 645 can be challenged with a properly specced 35mm system.

23
EOS Bodies / Re: Canon Confirms Development of High Megapixel Camera
« on: December 24, 2014, 03:03:07 PM »

A new line of EF lenses? Intriguing...

There was that patent about using the aperture in creative ways...maybe?

24
Third Party Manufacturers / Re: Samyang/Rokinon Tease 135mm Lens
« on: December 24, 2014, 02:55:56 PM »
I try to do DIY.  but fail, Not sharp photos  at all, May be Samyang/ Rokinon can help me.
Surapon

Perhaps you're taking the name "pinhole" to literally? :) While the pin is easily obtained it has a subtle drawback for such endeavors: it tears the hole, leaving the edge ragged and uneven. For holes of the highest quality one would want to have access to a laser drill. A stronger foil or very thin sheet of hard, short chipping phosphor bronze and a very sharp drill would be more viable for a home project, though.
It's the same idea we follow with the number and shape of the aperture blades in more common lenses - a subtle difference, but once you notice it...

25
EOS Bodies / Re: Ron Martinsen Blasts the 7DII in his review
« on: December 23, 2014, 12:55:13 PM »
This is an AF system that is 20 times as complex as that found in lesser cameras.... of course it will be harder to learn... and of course there will be a learning curve.

Much of the learning curve could be sidestepped with proper documentation, of course.
It's like having to rely on the various scene modes for exposure, an additional layer that makes understanding the underlying mechanics guesswork.

26
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.

27
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.

28
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...
Quote
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.

29
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.)

30
EOS Bodies - For Stills / Re: Vertical curtain velocity
« on: December 17, 2014, 05:31:49 AM »
If yes, how fast the curtain could travel?
Correct.
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.

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