Canon FD to X mount reducing adapter

JNR wrote:

Morris0 wrote:

If you want to take a quality lens and then add a so so element to it and get so so results, get one

Morris

Focal reducers vary in quality, and how particular lenses perform with various focal reducers also vary. In any event, they have several elements to take advantage of using the close-to-full image circle of a FF lens. The Metabones and Viltrox seem to score well above the lower cost offerings in detailed reviews.

Roger Cicala (Lens Rentals) did detailed analysis and came to a different conclusion than Morris (and he was surprised). Essentially, he found that concentrating the image can significantly reduce CA and improve contrast (slightly). That is what I have found with the EF100 f/2. A closer to flawless lens such as the L200 appears to hold close to even, but not improve:

L200 with Viltrox .71x reducer (EXIF of XC200 obviously is not correct due to FW version used)

All teleconverters induce at least a bit of degradation due to expanding the image and using less of the optical surface as designed. Sometimes they are a necessary evil. As for focal reducers, there clearly are instances that more fully using the FF lens as designed to concentrate the image onto the smaller image circle can actually improve optical performance, but the results tend to be highly variable.

Interesting and thank you for the correction.  Your image looks quite good.

Morris