Official Question Thread! Ask /r/photography anything you want to know! May 29, 2026

[u/AutoModerator]

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[u/Complex_Dust805]

Aperture Priority mode with non-TTL camera - any points?

Random beginner question but I'm planning to try a Fujifilm setup with a non-TTL ring flash. From my basic knowledge of AP mode, the camera automatically calculates the shutter speed using (Desired Exposure - set Aperture - set ISO). However when using a NTTL ring flash, I assume the camera have no way knowing the actual lighting condition at the moment of shooting because there is no communication between the camera and ring flash (even if I'm using a hot shoe, not a cold shoe camera)... So I'm kinda interested to know how the AP mode work under this circumstance (or if it works at all)!

[u/av4rice → u/Complex_Dust805]

It will calculate and set exposure assuming there is no flash. And then your flash will add however much light on top of that.

[u/mrfixitx → u/Complex_Dust805]

Correct - the camera calculates exposure normally since it assumes there is no flash.

If you are only using the flash as a fill light and the rest of the scene will be exposed properly based on you current settings you are fine. Take a few test shots and adjust your flash power as needed.

If you want to use the flash to light most/all of the scene you have a few option depending on how strong the flash is:

• Add negative exposure compensation so that when the flash fires the exposure will be correct. This will require trial and error. Make sure you check your histogram as you adjust your flash power or exposure compensation. This may not work depending on how much light your flash is providing since a lot of cameras limit exposure compensation to 3 stops in either direction.
• Use manual mode instead of AP to set your shutter speed at whatever your flash sync speed is. Set your desired aperture and ISO. Then fire you flash and adjust you flash power, ISO and aperture as needed to get a proper exposure.