For you optical types...what are the drawbacks to front mounting a lens in front of the aperture blades? In other words, the lens is front mounted on a shutter, the existing barrel has no aperture control, and the intent is to use the shutter's diaphram for stopping it down. The entire complete lens, front and rear elements are stuck out front of the diaphram still in the barrel mount. How will this affect lens performance versus having the aperture blades in between front and rear elements? I've looked at the Grimes explanation of this, but their example is using the diaphram blades of the front mounted lens, with the shutter behind, which isn't exactly what I have in mind. Other than possible loss of image circle and maximum aperture, what are the draw backs of this? Thanks, as always.
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