john_donkin

<p>Curt, Hosteen and Patrick,<br> Thanks for the response, guys. My principal interest is bird photography, which often can benefit from fill flash. Fluffing around with manual ISO settings to achieve a balance between shutter speed and overall exposure (as I have been doing) is not always productive - the bird usually disappears! <br> I feel Curt has confirmed my suspicions. As an example, the D7100 with Auto ISO and fill flash (with a SB 800) works perfectly in the field, with some clever exposure adjustments for background and subject.<br> Looks like it might be time for an upgrade.</p>

<p>I use a Nikon D300. With Auto ISO set at min ISO of 200, max ISO 3200, min shutter of 1/500 and Aperture priority, the camera works perfectly.<br> <br> If I use flash (either pop-up or a SB 800) the ISO reverts to the minimum ISO set as above and will not vary under differing lighting conditions. The ISO will not change under slow synch flash mode.<br> <br> I have updated the Firmware to 1.11 a and b.<br> <br> Is this normal for a D300 or do I have a hardware problem.</p>