Reply to Thread

Message:: [QUOTE="rmpsrpms, post: 2443636, member: 31773"]The 1:1 adapter for the Bokina is actually not just an extension. It has optics inside, thought I am not sure exactly what they do. I don't think it's a 2x teleconverter but somehow it allows the 1:2 lens to achieve 1:1. The XS is a very good camera for coins. It is what I recommend to folks looking to buy a camera for coins. Even though it's only 10MP vs 18MP for the T2...5 series, that's not a huge limitation. This is because you will rarely publish a full-size image, so some level of down-sizing is almost always done. I recommend at least a 2x down-sizing to minimize sensor aberrations. I also recommend integer downsizing to maximize downsize quality. For the T5, you would likely downsize a factor of 4x, from 5184x3456 to 1296x864. A crop to 864x864 or perhaps 800x800 gives an optimum size for web publishing. For the XS, downsizing the 3888x2592 by a factor of 3x yields the same 1296x864 image. So the difference between the two cameras is either downsizing by 4x, or 3x, to yield a publishable image. One other difference between the cameras is the Diffraction Limited Aperture, or DLA. The XS, with fewer pixels in the same size sensor, has a wider pixel pitch. This yields a smaller DLA versus the T5. For the T5, the DLA is f6.7, so any aperture smaller than that will start to show effects of diffraction. The XS has DLA of around f10, so is more forgiving of stopping-down the lens to get best DOF.[/QUOTE]