I love my D90 but I chimp the histogram to work out exposures with old manual lenses. The specs say the D7100 will meter them. just how is that done, little lights under and over kind of thing? This may be the impetus for me to upgrade. Thanks in advance, JBD90
The D7100 has a menu item for non-CPU lenses. You enter the max f-stop and focal length and then that lens meters just like any other. AIS lenses should meter correctly at all their range of f-stops but AI lenses probably won't.
Sun 09-Feb-14 01:37 AM | edited Sun 09-Feb-14 01:38 AM by jec6613
>The D7100 has a menu item for non-CPU lenses. You enter the >max f-stop and focal length and then that lens meters just >like any other. AIS lenses should meter correctly at all their >range of f-stops but AI lenses probably won't.
AI and AIS lenses both work fine in modes A and M, as you control the aperture with the aperture ring for non-CPU lenses. P and S will not work for either type of lenses.
If you chip your AI lenses, you can activate P and S mode on them and get an incorrect exposure, but out of the box that's not an issue.
When you put your lens information into the non-CPU lens menu, it works just like an autofocus lens with the switch in manual focus mode, except that you use an aperture ring on the lens instead of the front command dial, and it doesn't support P and S modes. That's about it.
Thanks all, I had read how the FX pro series cameras deal with manual AIs lenses. This seems to be similar. They could not easily deal with zoom lenses as the focal length had to be selected. It seems the 7100 is similar. I need to start shopping and get my D90 together to go on sale. Thanks all for the info.