I voted for the 50 cuz im using a 35mm on my APS-C so thats roughly a 50mm Fullframe. Id love to use a 35 on my aps-c but i dont find any appealing 20mm lenses.
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I am now using EOS600D for 1.5 years and I am also now deciding to upgrade my camera. However, many of my friends encourage me to switch to Nikon with the following reason below:-
Let's start with the f-stop ring set at 2.8 and the focus ring set at infinity. Now I begin to turn the focus ring clockwise, getting closer to the shortest distance of 0.18m. As the focus ring passes the 0.3m mark, it begins to turn the f-stop ring counterclockwise. Ever so slightly. By the time the focus ring is at 0.18m, the f-stop ring has turned to position f/4.
What's more strange is that the aperture blades are still in the fully o
The lens is really designed to be used with a hand-held exposure meter; probably it was built in the days before through-the-lens metering was available (certainly the case for Exakta). As you move into to close focus, you need to open up the aperture some more to keep the same effective f-stop, so for example an f/2.8 aperture setting on a close focus might only give as much illumination as f/4 would at infinity. If you had a through the lens meter, it would see the reduced illumination, but a hand-held meter simply does not know the distance to the subject or the focal length of the lens, so it can't compenstate. The Flektogon had a built-in mechanical compensation as I remember it. As you focus to shorter distances, it opens the aperture up. Of course, if you start off at f/2.8, it has no where to go, so instead it rotates the aperture ring to at least tell you what its effective aperture really is.