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PostPosted: Tue Jun 16, 2009 9:11 am 
Couldnt find much info on this but I did one reviewer who took IR landscape pics with the e-620 (its further down on this page):

http://www.ppmag.com/web-exclusives/200 ... e-620.html

Note: the exposure times were long (3.2 sec at iso 3200!) but he did use f/16 (I'll be using f/8 at most) and he was using a stronger IR filter than the one I have (which is the Hoya R72). I wonder what the equivalent exposure would be with the R72 at f/8 and iso 1600?


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PostPosted: Tue Jun 16, 2009 11:27 am 
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There doesn't seem to be much info on the I-ray characteristics vs R72, other than it claims to pass 700-1100nm compared to the nominal 720+ of the R72. So in that respect I'd suspect they're going to be very similar.

Also, just for info, I have recently bought two unbranded R72 equivalent filters from ebay, at under 1/3 the cost of the Hoya original. Side by side, I can't see any significant difference in the camera IR output between them so far. One of them does appear a little brighter by eye. So if people want to get in on the cheap, the unbranded ebay ones seem just fine. I'll write more on this later...

_________________
Canon DSLRs: 7D, 5D2, 1D, 600D, 450D full spectrum, 300D IR mod
Lenses: EF 35/2, 50/1.8, 85/1.8, 135/2+SF, 28-80 V, 70-300L, 100-400L, TS-E 24/3.5L, MP-E 65, EF-S 15-85 IS
3rd party: Zeiss 2/50 makro, Samyang 8mm fisheye, Sigma 150 macro, 120-300 f/2.8 OS, Celestron 1325/13
Tinies: Sony HX9V.


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PostPosted: Tue Jun 16, 2009 9:42 pm 
Thanks I got my Hoya R72 on the cheap too... from 2filter.com, it was around $32... I use it with my Oly e520 and the typical exposures I get are something like f/5.6 and 1/3 sec exposure at iso 1600 and it does autofocus fine, I compose using the LCD and live view and I can hand hold the shots at iso 800 and 1600 because of the IS. Do you think, based on those numbers, the E520 is more IR sensitive than the e-30 or e-620?


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PostPosted: Wed Jun 17, 2009 7:32 am 
Do you think this is a low level of noise for an e-520 at iso 1600? The rest of the particulars are f/5.6 and 1/3 sec shutter speed handheld with IS. I did a channel swap and autolevels:

http://gi73.photobucket.com/groups/i206 ... 0878ir.jpg

I find that if you keep saturation and sharpening to default values you dont see as much noise.


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PostPosted: Wed Jun 17, 2009 11:48 am 
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Location: UK
In general, I find IR to be quite noisy especially if you work in false colour as the green/blue channels tend to be very low to start with. So combined with ISO1600 I think that is within general expectations.

_________________
Canon DSLRs: 7D, 5D2, 1D, 600D, 450D full spectrum, 300D IR mod
Lenses: EF 35/2, 50/1.8, 85/1.8, 135/2+SF, 28-80 V, 70-300L, 100-400L, TS-E 24/3.5L, MP-E 65, EF-S 15-85 IS
3rd party: Zeiss 2/50 makro, Samyang 8mm fisheye, Sigma 150 macro, 120-300 f/2.8 OS, Celestron 1325/13
Tinies: Sony HX9V.


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