Okay, after seeing some of the amazing work posted in the image sharing section regarding meniscus lenses, I decided to try a few things with some smaller petzvals I currently have....
I have a 9" F4 darlot and a 5" F4 darlot. Both are lantern lenses, but they exhibit some interesting effects if I just use the front elements. So far so good. I realize that the focal length is approximately doubled as a result, but does that also apply to the effective aperture? Will they both approximately be F8 lenses? I'm looking forward to trying some of these combinations out when the weather gets a little warmer here!
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