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focus window question Anonymous
so i have a lens with a focus window

my question is at what focal lenght is this for? is it universal from my wide end to tele? like, if i'm at 17mm, it works, and at 55mm, it still works
>> Anonymous
These focus distance windows are more ornamental than functional on most lenses now. Yes, it's supposed to work at any focal length, but can you rely on it for focusing if it has no notches and like 5 numbers total?
>> Anonymous
meh, at least i can ball park it and see if i need to go more left or more right
>> Anonymous
focus windows are less useful for focus and more useful for manual flash

focus on a subject, look at the focus window for the distance from the camera to the subject, and based on the guide number of your flash, you can calculate the f/stop you need for correct exposure