Quantaray 500mm f8 Mirror
Most Quantaray lenses were made by Sigma and some were made by Tamron and Tokina. This lens performs like a Sigma Mirror lens. It is reasonably sharp if you can hold it steady. It has the typical ringed bokeh we see from mirror lenses. Contrast is surprisingly high. While it is not a Zeiss or even a Tamron in quality, it is still far better than any of the off-brands flooding the market.




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Minolta Celtic 200mm f4
Filter Size:
Lens mount:
Aperture Range:
Close Focus:
Macro Ratio
Year Introduced:
Tested with...
55mm
Minolta SR
f4 - ?
2.5 meters
n/a
1974
n/a

The Celtic series was Minolta's bargain option. While build quality was excellent image
quality was inferior to Rokkor lenses.
At f4 the 200mm f4 produces low contrast and soft images, which have a substantial amount of chromatic abberration.
At f5.6 it tightens up. Chromatic abberation is greatly reduced though still present. Sharpness is more than acceptable and contrast is excellent. See the tree comparioson. Unfortunately, bokeh fringing is pronounced at all usable apertures. See the mossy rock.

f5.6 - ISO 800
notice blue shift

f4 - ISO 800

f4 (left) - f5.6 (right) - ISO 800