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Review statistics for Greenways
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Auto Computron (Cosina) 135mm F2.8
Latest Review Posted Tamron 02F teleview eyepiece adapter
This may be the most unique, versatile piece of kit that came out of the Tamron 'Adaptall' line. If you already own vintage Adaptall lenses, this eyepiece adapter is an incredible way to transform them into an array of spotting scopes or telescopes. I have used the adapter for more than a year, and have enjoyed every minute. For astronomy, the adapter is especially ideal for use with a 300mm f/2.8 lens, which results in a 7mm exit pupil (which is generally the most ideal for nighttime light gathering, as it aligns with the maximum diameter of a human pupil). In fact, this lens combination may actually be too ideal with the 112mm front element of Tamron's 300 f/2.8. Looking at the moon is blindingly bright (with no teleconverters or ND filters). This is (of course) a good problem to have. Everywhere you look in the sky, hundreds of stars appear. Andromeda is faintly visible in the city, mostly blocked by light pollution. As a spotting scope, the 15x magnification is effective. Images are crisp, immersive, and engaging. The depth of field can be a bit narrow for fast-moving targets, but this depends on the lens. The 90° prism makes this difficult for animals and birds at ground level, but also creates unique opportunities for small tripods, tall trees, and observations in flight. Not recommended for those who don't have a flexible neck :lol: The most remarkable aspect of this adapter is the eyepiece. It features a fantastically wide field of view, with a surprising amount o...



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