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It [the D3] will even work with that confounded 70-300 P, lens. The only way I can toggle auto iso is change shooting banks. Is there a firmware where the Fn button can pull up the top entry in "my menu?"
There is no way to focus an AFP lens on a D3. You can mount it, but the stepper motor won't focus. It will stay focused at the distance you focused it last time on a compatible camera.
AFP lenses work only on these cameras:
- All series 1 cameras with FT1 adapter
- Nikon Df
- Nikon D5 and D6
- All Nikon Z cameras with FTZ adapter
- Nikon D850, D810, D810A, D780, D750, D610, D600, D500, D7500, D7200, D7100 (only with the most recent FW upgrades)
- Nikon D5600, D5500, D5300, D3500, D3400, D3300 (only with the most recent FW upgrades)
There are some ways that you can map the Fn button in a useful way. The configuration menu allows you to choose Matrix or Spot, Non-CPU type lens, choose image area, ... and also the SHOOTING BANK you'll be using. This is what serves you!
First, you have to configure two shooting banks (say A and B) so that bank A has Auto-ISO ON and bank B has Auto-ISO OFF. You've done it already, so I will not explain it here.
[on the top display you will see which shooting bank you are using: near the lower L corner you will have SHOOT A B C D (with one of the letters indicating which bank you are using)
You will have noticed that in the back of the D3, above the small LCD, there is an ISO button: this serves to adjust the
base ISO level, and its value shows in the display. This is useful in association with Auto-ISO to set the LOW ISO level that Auto-ISO will use, or to set the ISO value altogether when Auto-ISO is OFF.
In the viewfinder, there will be (to the R of the f/stop) one of these: ISO (non-blinking) or ISO AUTO (blinking): this is useful when you change shooting bank to know if you are using Auto-ISO or not.
Now, let's configure the Fn button (it can be done with other buttons: Preview, and AE-L/AF-L, but the Fn is in the best position):
Click Menu...Custom Setting Menu...
f Controls...f4 (Assign Func Button)
Func button + Dials...and select
SHOOT (shooting Menu Bank) from the menu.
Press OK and you're done
Now every time you press Fn and rotate the rear or front dial (both are active), you will switch from Shooting bank A to B (and also to C and D, but one click of the dial is enough to pass between A and B and vice-versa). You will see the
ISO change to
ISO AUTO blinking and vice-versa in the viewfinder, no need to chimp through menus on the big LCD. The ISO / blinking ISO-Auto will also be visible in the small rear LCD.
Hope this answers your question
Ciao from Massimo