| Joined: | Mon Apr 2nd, 2012 |
| Location: | South Lakeland, UK |
| Posts: | 4066 |
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The D700 and the D3, D3S and D3X have an Infra Red LED which shines through the shutter during the exposure to monitor the shutter speed duration.
If you replace the standard Low Pass Filter (LPF) with one which transmits 720nm you will get fogging and patchy exposure caused by the IR LED. In normal use the LPF stops the IR the LED transmits.
Since then the D7000 has been redesigned using an LED which transmits at a longer wavelength which does not cause a problem for normal 720nm IR photography.
Regarding ISO, a bit higher usable sensitivity could be handy to raise shutter speed and close aperture. That really comes into play with UV because long exposures of up to a second are normal, precluding hand holding.
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Robert.