I always try to shoot in ISO 100. You have to give that up for 200 if you use HTP. Is it worth the loss of th 100 ISO?
irish1 Senior Member 277 posts Joined Feb 2007 Location: Arizona More info | Sep 28, 2007 15:52 | #1 I always try to shoot in ISO 100. You have to give that up for 200 if you use HTP. Is it worth the loss of th 100 ISO? Canon 40D, Sigma 17-70, Sigma 10-20, nifty 50, 50 1.4, 85 1.8, 70-200 4L, 70-200 f/2.8 IS, 430 EX, Manfrotto monopod, tripod and ball head, Tamrac MAS system
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Sep 28, 2007 15:53 | #2 Above should read "Is it worth the loss of the 100 ISO?" Canon 40D, Sigma 17-70, Sigma 10-20, nifty 50, 50 1.4, 85 1.8, 70-200 4L, 70-200 f/2.8 IS, 430 EX, Manfrotto monopod, tripod and ball head, Tamrac MAS system
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farrukh Goldmember  1,969 posts Joined Jul 2005 Location: Lahore, Pakistan More info | Sep 28, 2007 15:57 | #3 Go through this thread for some insight on HTP : https://photography-on-the.net/forum/showthread.php?t=382050 5D Mark II + 40D | Lenses: Sigma 150-500mm BigmOS / Canon 24-105mm F4L IS / Canon 70-200 F4L IS / Canon 85mm 1.8 / Sigma Macro 70mm f/2.8 EX / Sigma 10-20mm EX / Canon 50mm f/1.8 II / Sigma 1.4x APO TC / Kenko 2x PRO300 DG. Lighting: Canon 580EX II + Metz 58 AF-1 + Sunpak 383...
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DougPardee Senior Member 838 posts Joined Feb 2007 Location: Southern California, USA More info | Sep 28, 2007 16:22 | #4 What's your concern about it?
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gooble Goldmember  3,149 posts Likes: 1 Joined Jul 2006 Location: Mesa,AZ More info | Sep 28, 2007 17:36 | #5 Also correct me if I'm wrong but I've recently come across info suggesting that ISO 200 has a lower signal to noise ratio than ISO 100 particularly in the 30D and it may apply to other models as well.
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jdizzle Darth Noink  69,419 posts Likes: 65 Joined Aug 2006 Location: Harvesting Nano crystals More info | Sep 28, 2007 17:54 | #6 Doug Pardee wrote in post #4027350  What's your concern about it? You're not actually "losing ISO 100". When you shoot at ISO 2oo (HTP), the sensor is set to ISO 100 while the metering and exposure are set for an exposure index of 200. As a result, the raw capture is approximately one stop lower than normal, giving one stop of additional "headroom" for highlights. Does the reduced exposure mean that you get more noise in the shadows? Yes, and Canon is quite clear about it (see page 157 of the 40D manual). Very true about the noise in the shadows which is why I only use HTP when I need it.
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sbressler Senior Member 613 posts Joined Jan 2007 Location: New York More info | Sep 28, 2007 18:16 | #7 gooble wrote in post #4027747 Also correct me if I'm wrong but I've recently come across info suggesting that ISO 200 has a lower signal to noise ratio than ISO 100 particularly in the 30D and it may apply to other models as well. I heard this same thing about the XT/XTi. Any proof or further insight? FOR SALE/TRADE: Canon EF 28-70 f/2.8L | Looking for a 1D Mark III? Look here!
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