Tracy B. Loc: Indiana

Sorry Ed, I know nothing about Nikon Cameras. I own a Canon 5D Mark IV. Hopefully, someone who owns your camera will respond.
I found this. Look at next post.

Tracy B. Loc: Indiana

Ed, I just found this:
Download Center D7500 Online Manual ISO Sensitivity Auto ISO Sensitivity Control
Auto ISO Sensitivity Control
(P, S, A, and M Modes Only)

If On is selected for ISO sensitivity settings > Auto ISO sensitivity control in the photo shooting menu, ISO sensitivity will automatically be adjusted if optimal exposure can not be achieved at the value selected by the user (ISO sensitivity is adjusted appropriately when the flash is used).

Select Auto ISO sensitivity control.

Select ISO sensitivity settings in the photo shooting menu, highlight Auto ISO sensitivity control and press 2.



Select On.

Highlight On and press J (if Off is selected, ISO sensitivity will remain fixed at the value selected by the user).



Adjust settings.

The maximum value for auto ISO sensitivity can be selected using Maximum sensitivity (the minimum value for auto ISO sensitivity is automatically set to ISO 100; note that if the ISO sensitivity selected by the user is higher than that chosen for Maximum sensitivity, the value selected by the user will be used instead). In modes P and A, sensitivity will only be adjusted if underexposure would result at the shutter speed selected for Minimum shutter speed (1/4000–30 s, or Auto; in modes S and M, ISO sensitivity will be adjusted for optimal exposure at the shutter speed selected by the user). If Auto is selected, the camera will choose the minimum shutter speed based on the focal length of the lens; choosing fast speeds when photographing fast-moving subjects reduces blur. Press J to exit when settings are complete.

leftj Loc: Texas

Yeah I tried it a long time ago and found it to be a hugh inconveinance.

wapiti Loc: round rock, texas

"defeats the purpose of shooting on a tripod"? Please explain.

PHRubin Loc: Nashville TN USA

OK - You talked me into it. I will try BBF for a week or 2.

pshane

I am embarrassed to have to ask, but at 74 yrs old, and shooting since the 5th grade, I have not seen or heard the term 'BBF' or 'FBF', so would someone complete my embarrassment by defining these terms, please? - (seems as the 'F' part may have something to do with 'Focusing'?)

dmc Loc: Montgomery, AL

"I am embarrassed to have to ask, but at 74 yrs old..."

They simply mean 'Back Button Focus' and 'Front Button Focus'. Best to just look it up on Youtube for your camera.

bleirer

It's fine for a tripod, the focus is locked wherever you set it when your thumb is off the button. Off course your lens still has a switch to shoot manual focus when needed.

bleirer

Back button focusing. One goes into the menu to turn off the usual half press of the shutter to activate auto focusing, instead uses a button under the thumb, say af-on, to auto focus only when the thumb is pressing it. When thumb is released the autofocus is locked at that position. Only useful in a tracking mode, servo or whatever your brand calls it. In regular focusing you can keep focus locked with a shutter half while you are recomposing, but in servo you can't normally recompose easily because the focus doesn't lock with the shutter half press.

This video applies to Nikon but the idea is the same. https://backcountrygallery.com/af-on-and-back-button-autofocus/

RWR Loc: La Mesa, CA

Thanks for pointing that out.

BlueMorel Loc: Southwest Michigan

After many posts on here prompting the use of BBF I finally gave in and set it up on my camera. It didn't take me long to get used to it, and I won't go back. I wear glasses but my thumb doesn't rest near my glasses.

Chromodynamics6 Loc: Beverly Hills Ca.

BBF is a great idea for some but it doesn't work well for me. I used BBF for several years and went back after I used my sons camera for a few days. When I lift my thumb and press the back button, I am not able to keep my grip as firm and steady as when I use the shutter release button. For me it causes too much camera movement and in turn too much motion blur. I'm not able to keep the camera as steady while using two digits on the same hand to complete the operation. If I could have anything I wanted I would move the focus button to a spot on the lens that would allow me to push it with my left thumb and then switch quickly back to the shutter release button when the need arises.

FiddleMaker Loc: Merrimac, MA

I would like to try your method as I also have a D750 but I don't know what FBF stands for and where is the mirror box ?
Thanks, ~FiddleMaker

RWR Loc: La Mesa, CA

Programming the Fn or DOF button (FBF) may be worth a try.

bleirer

You might try the alternative method I suggested earlier. Keep the shutter half press set the regular way, but reprogram the af-on button to really be autofocus off. That way you lock focus by pressing the af-on button. Sounds weird I know. But you get used to it quickly because it accomplishes the same thing as BBF, the only difference is that in BBF lifting the thumb locks focus, this other way pressing the thumb locks focus, or allows you to manual focus, but it's business as usual all the rest of the time. It's stable because you don't lift the thumb to shoot, just keep it pressed.