mercer Posted July 5, 2015 Share Posted July 5, 2015 Has anyone used the Roxsen brand of speedbooster, specifically the m42 to NEX?I just picked up an a5100 body at a great price and I was thinking of using a focal reducer with it.I saw they make them for m42 lenses, so I am curious to try it with my Carl Zeiss Jena 50mm 2.8 and 35mm 2.4 Flektogon. Or is a speedbooster with an APS-C pointless? Quote Link to comment Share on other sites More sharing options...
Stakers Posted July 5, 2015 Share Posted July 5, 2015 I've been using one of their focal reducers for my BMPCC and I haven't taken it off since I got it. It's the EF to MFT adapter, but I use it a lot with my m42 glass (with Canon adapter) and its worked really well for me. I know it's not the same one you're looking at, but wanted to share my experience with their products. Haven't seen any blue spots or anything to make it unusable. mercer 1 Quote Link to comment Share on other sites More sharing options...
mercer Posted July 5, 2015 Author Share Posted July 5, 2015 I've been using one of their focal reducers for my BMPCC and I haven't taken it off since I got it. It's the EF to MFT adapter, but I use it a lot with my m42 glass (with Canon adapter) and its worked really well for me. I know it's not the same one you're looking at, but wanted to share my experience with their products. Haven't seen any blue spots or anything to make it unusable. Thanks, I didn't realize you could stack adapters, does it maintain infinity focus when you stack? I also have a set of nice Pentax K lenses... Maybe I should get the Roxsen PK to NEX and then get M42 to PK. Do you use other brands with it via the ef to m43rds? Quote Link to comment Share on other sites More sharing options...
TheRenaissanceMan Posted July 5, 2015 Share Posted July 5, 2015 Stacking adapters works just fine as long as you keep to the prescribed flange distance for that lens. If you have a Canon EF speedbooster on your micro four thirds mount, it is for all intents and purposes an EF mount and will work fine with any adapter that promises infinity focus on a Canon camera. As for the Roxsen Speedbooster, you're in luck! I actually own that exact Speedbooster for my FD glass. It's definitely not useless on an APS-C camera; in fact, I like using Speedboosters to get double the focal length choices from the same number of lenses. For example, if I have a 24mm and a 50mm, that gives me a 24mm (24 on the SB), a 35mm (24 with straight adapter), 50mm (50 on the SB), and 75mm (50 with straight adapter). More flexibility, less weight. It also just gives you another aesthetic choice with your lenses--do you want the S35 look, or the VistaVision/FF look? The Roxsen has performed fine in every situation I've used it in thus far. No issues with weird flare, strange bokeh, or softness on the edges. Just brighter, sharper, wider images. Then again, mine is for M4/3. You may get different results on the Sony. mercer and amateurmike 2 Quote Link to comment Share on other sites More sharing options...
PannySVHS Posted July 5, 2015 Share Posted July 5, 2015 Hallo, The Roxsen/Camdiox example I just tested for m43- FD was not precisely enough manufactured. It almost did'nt comeoff the camera and lens almost did'nt come off neither. So it seems like it could be a gamble. Just don´t force your lens on toit like I did, rather do some light metal work on the boosters mount, so everything can fit. Quote Link to comment Share on other sites More sharing options...
TheRenaissanceMan Posted July 5, 2015 Share Posted July 5, 2015 I've heard some horror stories about adapters and speed boosters for FD lenses. Luckily, I haven't experienced any problems with fotodiox or fotasy adapters, nor with my Roxsen speed booster. My advice would be to work gently, don't force anything, and contact the company for an exchange if anything isn't working to spec. Quote Link to comment Share on other sites More sharing options...
mercer Posted July 6, 2015 Author Share Posted July 6, 2015 I've been pretty lucky with adapters as well, other than most focusing past infinity... The regular ones anyway. Do the Roxsen speedboosters focus past? Quote Link to comment Share on other sites More sharing options...
TheRenaissanceMan Posted July 6, 2015 Share Posted July 6, 2015 I've been pretty lucky with adapters as well, other than most focusing past infinity... The regular ones anyway. Do the Roxsen speedboosters focus past?Not in my experience. I think they have a tiny screw to fine tune for infinity, though. Quote Link to comment Share on other sites More sharing options...
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