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Join date: July 2022
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on Nov 15, 2023 23:32:02 GMT
Posted: Nov 15, 2023 23:32:02 GMT
sigma 28/1.8 aspherical highspeed wide has MM. i was surprised. have Novoflex/Tamron 60-300 follow focus.has autoaperture,and MM if i dont err must check. Adaptall 2.had to get new adapter since older was worn out C/Y mount. since lens locker of AX was made a tiny but wider to stop or minimize wobbling specifications of the slit in adapter must match. also mentioned sigma(on aps-c tested fabulous also fully open special bokeh not unsharp. also in the corner almost no CA. all the mentioned worned out defects on lens dont matter on other models. only AX affected.
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Post: 770 (71 liked)
Join date: August 2016
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on Nov 23, 2023 16:59:35 GMT
Last Edit: Nov 23, 2023 17:00:11 GMT by xkaes
Around 1970, for a short period of time, Tamron dipped its toe into the pool of large format optics by making a full line of high-quality, achromatic, coated, large format lenses based on the well-known Dagor 6/4 design. Ranging from 105mm to 300mm focal lengths, these lenses were intended to be an alternative to expensive, German-made, large format lenses. To accomplish this, these lenses reduced cost by offering smaller maximum apertures -- f6.8, instead of the more common f5.6 -- and had less covering power. But unlike most Dagor-type lenses, Tamron added lens coatings to their line-up. They all have a 70° angle of coverage, and they are all symmetrical -- and quickly convertible. By simply unscrewing the front lens group, the focal length of the lens nearly doubles -- as do the f-numbers. Consequently, every Copal shutter has two f-stop scales -- depending on if the lens groups are used "combined" or "converted". The shutters were all Copal -- #0, #1 & #3 -- and appear overly large for these otherwise very compact and light lenses. They can be hard to find, due to their short production period -- which can result in much higher than reasonable prices for a "budget" lens. www.subclub.org/fujinon/colortamron.htm
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