<p>I am not familiar with cameras, since this is my first one, and I have only had it for a couple of months. So, as I am not sure how they behave, I have a question about my New F-1 and how it operates.</p>
<p>When I mount my lens to the body, I have to press the stop-down slide for the aperture to function. To be clear, I mount with red line NOT showing, then press slide button after the lens mounted - otherwise the aperture does not operate. Just making sure this is normal because I don't remember reading in the online manual about having to press it to use my lens aperture. Thanks!</p>