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Messages - bvukich

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31
EOS Bodies / Re: EOS 7D Mark II Talk [CR1]
« on: October 10, 2013, 11:22:46 AM »
My guess - greater than 22.1 megapixels. That gives you 3x1920 pixels across, allowing for easy bining of a 3x3 pixel block from the sensor into a single pixel of 1920x1080 video... add a few pixels to each side for video stabilization and the 24MP sensor looks very likely.

How is binning at 3x3 on a grid that repeats at 2x2 easy?


Photosensors are in a 2x2 grid, but you're not binning a quad of photosensors; just the reds together, greens together (x2), and blues together...  So yes, it is easy.

In the attached image you bin the following:
r1+r1+r1+r1+r1+r1+r1+r1+r1=r1'
g₁1+g₁1+g₁1+g₁1+g₁1+g₁1+g₁1+g₁1+g₁1=g₁1'
g₂1+g₂1+g₂1+g₂1+g₂1+g₂1+g₂1+g₂1+g₂1=g₂1'
b1+b1+b1+b1+b1+b1+b1+b1=b1'
And you bin down right back into a bayer pattern which you can than save as-is, or demosaic, or whatever.

That method throws away half the light collected.

The 2x2 approach bins the 2 greens, 1 red and 1 blue in the block into 1 RGB pixel.  Simple and no light lost.

Rather than do the above, why not demosaic and interpolate with a simple interpolation method like bilinear?  That way, you'd at least keep all the light.

I'm sorry, but you apparently don't understand what binning is.

You're saying instead of demosaicing just use each 2x2 block of subpixels to create one rgb pixel.  That is not binning, and would really gain you nothing.  It should probably be better than line skipping, though.  However this is not binning.

Binning is adding the signals from all the same colored subpixels a square block (the way phase one does it is slightly more complex, each color is in a square, but the squares for each color that are combined are offset).  Binning reduces noise (main reason for doing it), and should improve low light performance (since the "metapixel" collects photons like an equivalent size pixel would. The tradeoff is reduced resolution (which is not an issue for video) and increased moire/aliasing because the AA filter is effectively nullified.

32
EOS Bodies / Re: EOS 7D Mark II Talk [CR1]
« on: October 10, 2013, 01:25:04 AM »
My guess - greater than 22.1 megapixels. That gives you 3x1920 pixels across, allowing for easy bining of a 3x3 pixel block from the sensor into a single pixel of 1920x1080 video... add a few pixels to each side for video stabilization and the 24MP sensor looks very likely.

How is binning at 3x3 on a grid that repeats at 2x2 easy?


Photosensors are in a 2x2 grid, but you're not binning a quad of photosensors; just the reds together, greens together (x2), and blues together...  So yes, it is easy.

In the attached image you bin the following:
r1+r1+r1+r1+r1+r1+r1+r1+r1=r1'
g₁1+g₁1+g₁1+g₁1+g₁1+g₁1+g₁1+g₁1+g₁1=g₁1'
g₂1+g₂1+g₂1+g₂1+g₂1+g₂1+g₂1+g₂1+g₂1=g₂1'
b1+b1+b1+b1+b1+b1+b1+b1=b1'
And you bin down right back into a bayer pattern which you can than save as-is, or demosaic, or whatever.

33
Canon General / Re: Baffles the mind
« on: October 09, 2013, 02:09:03 PM »
I've had a 5D3 since shortly after it was available, and I can honestly say I haven't shot a single second of video with it.  I also have a 60D, also since shortly after it was available, I think I've shot maybe two short videos.

I just have zero interest in video. Stills are way more interesting to me.

I don't have any illusion that a modern DSLR without video would be cheaper, in fact the opposite is more likely true.  I would bet however, that compromises in stills performance have been made to accommodate video.  But complaining about that would be pretty pointless.

Different strokes for different folks I guess.

34
Canon General / Re: Irritating photography advice
« on: October 07, 2013, 11:27:04 AM »
The funniest one I ever heard wasn't towards me, but a friend that's a professional photographer.

He was knee deep in a stream taking some long exposures of a waterfall, tripod, 10 stop ND, etc... and some older gentleman came down to the waters edge to tell him that he'll never be a professional photographer if he keeps using a tripod.

Lol, what?

At that point all you can do is smile and nod.

35
Reviews / Re: Rokinon 14mm f/2.8 Wide Angle Review
« on: October 01, 2013, 01:35:27 PM »
Has anyone had experience with the cine version of this lens? I understand that it does have a slightly narrower maximum aperture, but its ring is declicked which could provide dual purpose for video if the build quality and optics are comparable.

The aperture is identical, it's just given in t-stops instead of f-stops.

36
Landscape / Re: Stars...how to focus in pitch black...
« on: September 27, 2013, 02:33:52 AM »
i tried some star shots over the weekend with limited results, see two pictures. These were taken with 5DMKIII, 24-105, tripod and 30 sec exposure, 100iso. My questions is how to focus in pitch black :-\ :-\..there is probably a really simple answer about this but i struggled to get any infocus. any advice, suggestions would be great as i want to try again...and hopefully get  better pic's

The hyperfocal distance at 24mm f/4 is only 15.8 ft, so (greatly simplified) if you focus on anything farther than that, everything behind it will be in focus.  If you have foreground elements you want in focus, as long as they are farther away than that, just focus on them and the stars will be fine.

If you're only worried about the stars, then what I'll usually do is set the lens to infinity, and then back it off just a tiny bit.  Take a test shot, and check for sharpness at 100%.

37
Landscape / Re: Stars...how to focus in pitch black...
« on: September 27, 2013, 02:23:47 AM »
I don't know if 30 seconds is long enough to matter but at some point the (relative) movement of the stars will make them look soft focused or not.

Jim

The rule of thumb to get star pictures without trails is to divide 600 by the focal length, and use that in seconds for your shutter speed.  e.g. 600/24mm=25sec

38
Lighting / Re: Cheap manual flash to use for fill lighting...
« on: September 19, 2013, 11:51:31 AM »
I don't understand where the ND filter comes in.

He wants to shoot his 85/1.8 wide open.  To keep the shutter speed below xsync, in many situations, he'd need an ND filter to achieve this.

39
Site Information / Re: Banning ankorwatt
« on: September 04, 2013, 07:17:11 PM »
In the end, the people running the show/forum have (should have) right to decide what kind of platform they want to provide. If you don,t like it........

well thats really it.  Craig is running a business, not a social justice advocacy program. This means success is measured, among other things, by the revenue stream generated by such things as google adsense for example.  It means Craig sets the rules and operates the site in a way that meets his business/personal/whatever goals.  canonrumors.com has a marketable product -- exposure to an audience of photographers who buy stuff.  Advertizers pay money for exposure on the site because its their business to expose their products to an audience they believe is attractive.  Advertizers won't pay money for exposure on a site that doesn't have an attractive potential customer base.  If craig does not manage the forum in a way that provides that attractive audience for his advertizers,  he looses money.

based on the ads that I see, the way they are presented, and from what little I know of google adsense and the various resources out there that analize site traffic and estimate worth, I'd say Craig  you must have a attractive revenue stream that has taken you 6 years or so to develop.   good for you and hurray for capitalism. 

Managing the forum is simply carying out the interests of the site, a task which I imagine is not always peaches and cream.

Actually, it's simpler than that all around.  This site was never started as a revenue stream, and I believe self supporting (financially) is the only goal of that sort.  This site exists because of a personal interest of Craig's, and the desire to provide a community for people that share that interest.

And you're over-thinking the culling of undesirables to cultivate a desirable marketing base.  No profanity, no personal attacks (and obviously no spam).  That's really where it begins and ends.  Everyone that can play by those very simple rules is welcome and wanted.  All skill levels, all experience levels, etc.

40
P.S....  Subscribed... Ole!

41
Disclaimer: I know nothing about video...

Since your voice is the most important thing, I would get a mic on you.  It would save us from having to listen to the compressor on your refrigerator as well.

Great video though, I'm about 10 minutes in, and getting really hungry :D

42
Site Information / Re: Banning ankorwatt
« on: September 04, 2013, 01:36:03 AM »
I mostly read the updates on the latest cameras, lenses and firmware but I've often wondered if people find another person annoying then why respond to them in the first place? The back and forth attacks between ankorwatt and others seemed to go on forever, why not just ignore the other poster and move on? Clearly it is obvious that people are expecting reactions so they wait and wait until they receive a response thus thinking they are validated. It is all pretty immature, really.

I agree completely.  You feed a troll and it only becomes more persistent.  That is why I mentioned the behavior of other members; they also crossed the line, but I'm hoping by removing the prime instigator, that all the users that are normally good members of this community will return to "normal" and no further warnings or bans will need to be issued.

43
Site Information / Re: Banning ankorwatt
« on: September 04, 2013, 01:29:45 AM »
Trust me, it was his behavior alone (the worst of which has been removed and/or edited by mods as it happened) that got him banned.  He has been warned too many times to count, had temporary bans several times, and had his previous account permanently banned.  We gave him more chances than most users would get because we hoped he could tone it down and become a good member of this community.

Anything mentioning the behavior of others was purely editorializing by myself.

He is a professional photographer with many years of experience, and we paid undue respect to the knowledge that we hoped he could bring to this forum, but at the end of the day the endless bickering and fighting just wasn't worth it.  I know for a fact we've lost other forum members because of his bad behavior, and dozens of others complain constantly about him.  But that's not to say he was "voted off the island"...  The mods have had discussions going back to at least February about what to do with him, and this wasn't an easy decision to make.

44
EOS Bodies / Re: 70D vs D7100 ISO Comparison at 100%
« on: September 03, 2013, 10:23:31 PM »
Mikael, you are hereby banned for life.  Don't make a new account, don't come back.  You will be noticed, and we're not going to give you another chance.

You are knowledgeable and and can bring a much needed voice of dissent at times, and because of that we regret doing this, but you bring out the worst in everyone here, and your behavior can no longer be tolerated.

EVERYONE ELSE....

Your behavior in this thread has been no better.  You should be ashamed of yourselves.  Act like adults, and have civil discussions.

45
Technical Support / Re: Using IR function in Yongnuo 622's
« on: September 03, 2013, 07:28:43 PM »
ok,  problem solved.  I  had the right settings within the camera menu,  but I did have a ai  servo on.   thanks for the help y'all.

Awesome, glad you got it sorted.

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