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Feb 25, 2020 at 0:22 comment added xiota "Speedboosters" are focal reducers. They have a conversion factor ~0.7x. There are no focal reducers for DSLRs. The corrective element for lenses with FFD less than the camera body are usually ~1.4x. They are teleconverters.
Apr 13, 2017 at 12:43 history edited CommunityBot
replaced http://photo.stackexchange.com/ with https://photo.stackexchange.com/
Feb 23, 2017 at 19:48 comment added user7783780 This is a helpful and comprehensive post which has answered most of my questions. Thank you. Upvote accept.
Feb 23, 2017 at 19:47 vote accept user7783780
Feb 22, 2017 at 1:37 comment added scottbb @osullic :facepalm: Indeed. I'm pretty sure I knew that at one time. I have edited my answer to reflect that.
Feb 22, 2017 at 1:35 history edited scottbb CC BY-SA 3.0
Corrected for MC != Minolta MC/MD mount. Derp.
Feb 22, 2017 at 1:00 comment added osullic The "MC" does NOT indicate it is a Minolta mount lens. "MC" here (as it often does) stands for "multi-coated".
Feb 22, 2017 at 0:43 history edited scottbb CC BY-SA 3.0
added list of links
Feb 22, 2017 at 0:25 history edited scottbb CC BY-SA 3.0
added list of links
Feb 22, 2017 at 0:15 history answered scottbb CC BY-SA 3.0