0.667X teleconverter
Science fiction, but would it be great to have 0.667X TC (1/1.5X DSLR crop factor) This would allow 35mm SLR lenses to be used on digital SLR cameras but instead of loosing light, the TC would gain one stop by concentrating light and turning f5.6 into f4 but with f5.6 depth. Another gain would be full-frame usage from existing 35mm lenses.
I suppose it could be called a full frame converter.
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