February 28, 2015, 10:20:39 PM

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Messages - benperrin

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1
EOS Bodies / Re: DR from 5Ds will be 2 stop better then 7D mk II
« on: February 11, 2015, 06:11:59 PM »
It is definitely possible. There was a rumor...at least a year ago now?...that indicated Canon was working on some kind of active cooling. My guess is there is a fan or heat pipe of some kind in the camera body that moves heat away from the sensor, possibly releasing it along the body.


If the 5Ds is based on the same technology as the 7D II, it should be starting out with significantly lower dark current noise. It's got slightly different pixels, though, so it may not gain the same benefits as the 7D II. Active cooling should certainly help, however if the camera has 0.6e-/s/px dark current at 33C, it's already ludicrously low, so cooling would have a marginal effect. If the dark current is the same as the 6D, then active cooling could help.


One area where it might help more than others is when shooting in sunlight. I've photographed birds on some hot days, and I remember my camera getting very hot to the touch. Some kinds of active cooling (i.e. TEC) could certainly help keep dark current lower in such situations. Heat pipe or fan should also help a little, as a warmed up sensor would still likely be hotter than ambient.


It should also be noted that studies done decades ago showed that cooling does not seem to have any significant impact on read noise, only dark current. So I wouldn't expect any active cooling system to reduce read noise, which would be the primary source of noise if DC was 0.6e-/s/px.
Thanks for the response Jon. I can't say I've ever been in a situation where my camera was hot to touch. It probably doesn't get as hot here.

Now you've provided me with some interesting reading to think over. I'll have to do some research on dark current noise. Sounds like I'll be much happier with the 5dsr than the 5d2 if the 6d and 7d2 are already much better. Once again thanks for the response.

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EOS Bodies / Re: DR from 5Ds will be 2 stop better then 7D mk II
« on: February 11, 2015, 05:33:50 PM »
So anyway, wondering if anyone has an answer to this question. There's speculation that the sensor MIGHT run at a lower temperature and might have lower read noise. Would this affect long exposure noise in any way? The one thing I hate about my 5d2 is the long exposure noise. I can fix it mostly by combining 2 exposures (usually I only want the slow shutter speed for clouds or water) but I'd like to skip that step if possible. Does anyone know theoretically of course.

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EOS Bodies / Re: DR from 5Ds will be 2 stop better then 7D mk II
« on: February 10, 2015, 06:17:05 PM »
Well fair enough. I'm sure we've all been annoyed at Canon at one point or another for holding back a feature we desperately want that would really help. They certainly seem to be slower to implement features than other companies.

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EOS Bodies / Re: DR from 5Ds will be 2 stop better then 7D mk II
« on: February 10, 2015, 05:41:59 PM »
Jrista, why do you even shoot with Canon? You seem to bash them so much. The d810a was just announced. Maybe you should just make the switch. Sounds like you'd be a lot happier than you are here.

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EOS Bodies / Re: Canon EOS 5DS & EOS 5DS R Press Release
« on: February 05, 2015, 05:31:52 PM »
Not specifying the exact dr isn't a good sign, it's not like they're shy to throw around numeric spec data in this press release in other areas :-\ ... on the other hand it's strange that they mention it at all if they don't have something to show.
It's just a press release. We'll know soon enough but my money is on d810 like dynamic range. The megapixels seem to always get the marketing though. Not long till we know. This part is better than Christmas for me! :)

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EOS Bodies / Re: Canon EOS 5DS & EOS 5DS R Press Release
« on: February 05, 2015, 05:28:40 PM »
I am a 5DM2 hold over because I never felt the 5d3 was worth spending the extra $ on.  I do scenic still photography and once in a blue moon weddings (I do great weddings, just hate it).  I have no interest in Video.  I am not a film purist but I can see their point.  This just might be the right box for the still purist.

I am frankly seeing this as a logical split between portrait/scenic and the swiss army knife approach of the 5dm3 and perhaps the 5dm4 that will do everything in one box. 

I am very interested in moving to a better camera and the Nikon 810e and Sony A7 have been getting good review from scenic photographers but I am not willing to replace all my glass and start over.  I knew that Canon would change and a little patience would prove prudent.  I am more than ready to replace my 5DM2, having said that--I have had many incredible images with this body and do not feel that I have been short changed in the last 5 years or so.  I think I will be one of the first to order or pre-order the R version.
I think I'm in the same boat as you. Looking forward to the upgrade.

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EOS Bodies / Re: Bingo! New Canon 5Ds has 50.6 MP new rumored specs
« on: February 05, 2015, 07:52:13 AM »
Canon press release saying they are using a Sony sensor? Snowball chance in hell.

Notice how they mention increased dynamic range? Have they used that language lately?

It doesn't matter who made the sensor as long as it in improved tech I guess. :)
Well they only say wide dynamic range, not increased so we'll have to cross our fingers really tight until we find out if there is any improvement. I like the idea of a quieter shutter. Definitely looking like a camera I am going to like.

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EOS Bodies / Re: Bingo! New Canon 5Ds has 50.6 MP new rumored specs
« on: February 04, 2015, 08:56:03 PM »
Thanks for cutting through that all engrossing pop up flash debate....
As a pro architectural photographer I've been waiting for this camera for a long long time. They could make the high iso 800 for all I care if 100 has clean shadows. I assumed I would get the AA filter version but this post above makes me wonder. Would I be better served by the R version if the 50mpx sensor doesn't add much moire? There are a lot of situations with repeating patterns in building materials.
This is something I'm certainly interested in talking about. Also once some post sharpening is applied do people think that the s version can match the r? Or is the r still going to maintain an advantage? Can't wait to see some real world examples.

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EOS Bodies / Re: Bingo! New Canon 5Ds has 50.6 MP new rumored specs
« on: February 04, 2015, 07:05:56 PM »
I use a 5 series, and I bought a Sunpak RD2000 because my 5D doesn't have a pop up flash.

I would be interested in this camera if it weren't for the poor high ISO range and the presumed color filter choice that caused it.  I shoot less than 15% of my shots at ISO 100.  I shoot more above ISO 1600 than at ISO 100.  I'll wait for the 5DIV.
Fair enough. I'll admit, I'm at ISO 100 about 90-95% of the time so the 5ds is probably more suited to my needs than yours. I may also purchase a 5d4 down the track though specifically for event photography. Of course we have no idea what this camera is actually capable of yet.

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EOS Bodies / Re: Bingo! New Canon 5Ds has 50.6 MP new rumored specs
« on: February 04, 2015, 06:46:56 PM »
If a pop up flash is the only way to get the shot, why bother pushing the shutter button at all?
This is my philosophy as well. There are some pretty heated posts here making responding in a rational manner difficult. I have to ask though; how many people here that are advocates for pop-up flash are even using a 5 or 1 series and are even interested in this upcoming camera?

Anyway, this topic has been a diversion from the real subject of interest. It will be interesting to see how this new camera performs in the real world and if Canon does indeed launch a 5d4 later in the year.

11
EOS Bodies / Re: Who is going to buy the new 5Ds's?
« on: February 04, 2015, 06:17:13 PM »
Stunning portfolio, mate!
Thanks mate. Enjoyed viewing some of your killer shots as well!

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EOS Bodies / Re: Who is going to buy the new 5Ds's?
« on: February 04, 2015, 05:51:47 PM »
I'll be lining up for this camera but will also read the reviews with interest. Coming from a 5d2 (which has been fantastic) I think it's time for an upgrade. I was so close to upgrading to the mk3 just for the dual cards so I'm 98% sure I'll be pulling the trigger on this. With landscape being a big deal to me and wanting to print more and in larger sizes, I'm sure this camera will be worth the money for me.

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EOS Bodies / Re: Bingo! New Canon 5Ds has 50.6 MP new rumored specs
« on: February 04, 2015, 02:28:17 AM »
oh really?

and suppose something unexpected happens and you are close but have no flash and they need a shot and there is terrible back lighting?

it's happened to me and others and it was interesting to see all the pros asking to borrow the xxD people had for the shot and tossing their 1D's to the side

or maybe you are on a trip and mostly taking landscapes but then want a few shots with friends now and then and don't wanna be dragging a flash along, just one more thing to be a menace and a drag

great if you happen to run around EVERYWHERE, ALL THE TIME, with a reflector

maybe you are coming back at night and suddenly a tree frog pops out?

maybe the Stanley Cup came for a secret visit without prior announcement and they want one pick and everyone is backlit and it has to be taken in that direction and you were not on call but happened to just have your camera with you but no flash and nobody else was close enough to make it in time? I was sure glad I was still using an xxD camera then and, for the record, so was the other guy who showed up and tossed his 1D aside and used my xxD for his shot too. He didn't thumb his nose at the xxD and get all snooty and ridiculous, he was just like awesome, this is great, gotta love the pop-up, all cameras should have this.

etc.
I would go back and forth with you all night but I don't think it would get us very far. There are solutions to all of those problems and I don't think the popup flash is the correct one.

When considering light we have to remember 3 main factors; quality, quantity and direction. A popup flash can only address the issue of quantity, which stills leaves poor quality and bad direction. Is that acceptable to you as a photographer? It might well be and that is totally fine but for me (and this doesn't have to apply to anyone else) I find that light to be lacking. YMMV.

Anyway, it's all a pointless discussion. Canon won't include a popup flash on the 5d and 1d series anyway.

14
EOS Bodies / Re: Bingo! New Canon 5Ds has 50.6 MP new rumored specs
« on: February 04, 2015, 12:05:58 AM »
You're just wrong.  What makes you think I'm taking flash dominated exposures of people up close?  I'm often using it for fill, and only occasionally of people.  I had to buy a little hot shoe mounted flash to replace the missing popup.  If I always carried a 580 I'd have to leave something behind that I want to carry, probably my 35/1.4L.
Even for fill it is terrible. Use a reflector or modified flash off camera and the results are a lot better. Small light source in relation to the subject = harsh ugly light. Keep that light source on camera and the results are worse. Also I didn't make any assumptions as to what type of images people are taking. Sorry, but it's just not a professional feature.

15
EOS Bodies / Re: Bingo! New Canon 5Ds has 50.6 MP new rumored specs
« on: February 03, 2015, 11:04:53 PM »
I'd love to have a pop up flash on my 5D because it would be useful and I wouldn't have to carry my mini flash. 
But the posers can't have that because then they won't look like real pros as they wander about.

The pop up flash is pure garbage. An on camera small light source is always a bad idea even as an optical flash trigger. There is no point in including this on a professional camera. It has nothing to do with looks. I'd rather them use that space for something I might actually use.

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