The reason this lens is so popular is that the 50mm f/ is faster optically. That means it has a larger opening, or aperture, in front that lens to let in more light. More light means better pictures. Note that you won't be able to use these lenses completely wide open at f/ on star fields because of the aberrations that extremely fast lenses have. You will have to stop it down a stop or two until you get stars that you personally find acceptable. But even stopped down to f/4, you will record twice as much light in the same amount of time as with an 18-55mm lens at f/ at 50mm.
I’ve been using the pharma proviron for 3 months at 25mg, 2x day and it’s elevated my free test as I’ve experienced on other bayer pharma proviron. I’ve been dosing my arimadex at .25mg E3D and it’s kept my E2 in range. My mid-cycle bloods confirmed the effectiveness. Since this was my 1st time using Roidsmall, I used a pregnancy test to test the HCG. I’m currently running 250iu 2x/week and the effectiveness is also visible. I just started running the caber so it’s too soon to report on effectiveness.