Hi all, I need some help since I have never done this, if I remove the front ele ment or rear element of a lens to obtain a different focal lenght, how do I know what F stop it is? I suppose the f stop changes since thr ratio of the aperture to focal lenght has changed, but how do I calculate it? does anybody have a for mula or method out there? I would greatly appreciate it if you guide me on this! Cheers and good shooting to all!
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