7d dynamic range against the 5d

aaahhh Amsterdam....A place I go to too often for my own good:happy:

Careful with a camera there tho...I saw someone getting an slr smashed for sneeky filming there.
 
You must mean the Sigma 10-20mm F4, not 3.5? If you're at iso 1600 or above you should put the HTP on otherwise you are throwing away 1/3 stop, from that thread on reduser:

http://www.reduser.net/forum/showthread.php?t=34434&page=26

"If you adjust ISO, but keep brightness the same by changing exposure, then the dynamic range is highest at ISO 100, stays about the same at 200, then starts going down from there. The dynamic range will vary most greatly by the picture profile settings. With low contrast settings, ISO 200 will have more dynamic range than ISO 400. But with high contrast, the difference may not be noticable.

The "plus 1/3" ISO settings (125, 250, 500, 1000) should be avoided, as explained above. The "minus 1/3" ISO settings are fine, as long as you know that they have 1/3 less highlight headroom.

Highlight tone priority trades one stop of shadow noise for one stop of highlight headroom. I use it a lot. It should always be enabled for ISO 3200 and 6400, since in those cases there is no noise penalty from HTP, so you get the one stop of highlight headroom for free."
 
Must I really? Tell the Sigma people to stop putting 3.5 on the box and lens and I will :)
Pretty nice lens, F3.5 for the whole zoom range. Maybe you must google first :)

Yeah good tip for other people: HTP is nice, first thing I turned on in my night custom when I got the 7d.
 
Haha, I did look for it, I wanted to know if it was the same lens I just bought. Found it now, and think I bought the wrong lens. poo.
 
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visualbrother said:
Must I really? Tell the Sigma people to stop putting 3.5 on the box and lens and I will :)
Pretty nice lens, F3.5 for the whole zoom range. Maybe you must google first :)

Yeah good tip for other people: HTP is nice, first thing I turned on in my night custom when I got the 7d.
Click to expand...

Highlight Tone Priority introduces noise in mids and blacks that isn't present when disabled.
 
Well I'll have to compare HTP for high iso, but the suggestion was that you may as well use it since there is no penalty there.

The reason 160/320/640/1250 look less noisy is because the highlights are being clipped according to the other thread...
 
No penalty? Of course there's a penalty, there's always a penalty whenever there's a benefit. Every setting, every change involves a compromise.

My understanding on HTP (which would back up Kholi's observation) is that it drops the ISO by a notch to preserve highlights, and it adds gains to the lower and mid tones to boost the perceived sensitivity back up.
 
I'm only quoting what Daniel Browning said in the thread linked above, he seems to know what he's talking about.
 
Well, okay, but he said "no penalty" in the specific case of ISO 3200 and 6400. Assumedly he means that because there's so much noise already, a little more doesn't make any difference?
 
Yes the Sigma 3.5 is brand new, guy in the shop pointed it out when I was going to buy the Canon 10-22 and told me the Sigma was 3.5 all the way (yes I like anything that goes all the way...........).

Ok here is a shot made with the 7d and Nikon 80-200 Zoom, shot at ISO 200 with HTP on around 17:30, lots of sunlight in the clouds and every shot like this is full of weird artifacts in the high lights.



the zoom is done in post to show what is going. Funny thing is you can actually get rid of it with some grading in Color, but still it was a bit of a shock to see first time.

The plan was to do a lot of night shooting, dark areas with loads of lamps so HTP was already turned on. Not sure if it has anything to do with this though, only saw the effect at home or would have tried a few different settings.

Image settings: Neutral with contrast set as low as possible.

Wil experiment some more later this week.
 
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