MFT Lens Turbo II Flare

Started Jul 13, 2017 | Discussions thread
brian Senior Member • Posts: 1,211
Re: Other People's Experience

Alan WF wrote:

Has anyone else seen this problem with their focal reducer?

I’ve searched for references to this problem with the LT2, and I can’t find any. This surprises me; the flare was very obvious the first time I took a back-lit photograph. I bought my LT2 quite recently, so I wonder if Zhongyi have changed the mechanical design of the lens barrel so that recent ones flare.

I’ve also not found any references to this problem with the MetaBones SpeedBooster™. This has larger optics than the LT2, so it should be less susceptible. I’d also not be surprised if the barrel was better designed to avoid reflections, given the higher quality of the design and manufacturing of the SpeedBooster. Perhaps Brian might like to comment on this.



Hi Alan:

I've seen Speed Boosters produce faint greenish ghost images when a super bright object like the sun is in the field of view.  However, I haven't seen the sort of glare you are showing - though to be honest I haven't deliberately searched for that particular effect.  The inner mechanical barrels of Speed Boosters are fairly simple with only two or three parts.  Also, the coatings are a high quality multilayer type with typically ~0.3% reflection in the visible waveband.

My schedule is chaos these days, but if I get a chance I'll shoot some trial images to see if I get the kind of glare you are seeing in back-lit situations.

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Brian Caldwell

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