Jörg Krüger
28 mm Lens Comparison, Center
Sample pictures of this group of lenses. The set-up is almost like at this standard lens comparison. The same chart for the border.
This chart consists of 140x170 px crops of a 7360x4912 px picture by a full frame sensor, taken from the center. As a reference, the exposure was taken from the Sigma lens at f/8, so every exposure for each lens was 1/60 s at f/8 and 1/125 s at f/5.6 and so on. Also the white balance was taken from this capture, to compare colors. The photos were taken with ISO 100 in JPG format, highest quality, without any picture "enhancement" like sharpening, saturation or noise reduction, the crop was directly taken from the ooc picture.
The focus was set manually with 16x magnification of the live view accurately onto the "4th Color Layer", the "Adox" box is just behind the Fuji box, the idea was to observe an increasing depth of field, but it was too large already at open aperture. The electronic shutter was used, the distance sensor to subject was 2,63 m.
The exposure is very constant, just the Sigma is too dark and the Pentax-M too bright. Obviously the aperture of the Pentax doesn't close correctly.
It is the first time I see that a lens has real trouble with center sharpness: you have to stop down the Hanimex HMC up to f/8 for a decent result. The Fujinon is also a bit soft wide open. The zoom lens doesn't show a good sharpness at every f-stop, but this very constant.
The leading group in my opinion is the Sigma, the Pentax-M and surprizingly the Hanimex Automatic. The Sigma is fine already at f/1.7, but you can see blurring caused by diffraction from f/16 on.
The 8-element Porst H has a tiny bit more contrast wide open than the the 6-element Porst F, otherwise the difference is negligible.
Surprizingly the chromatic aberration seems to be very well corrected for all lenses. Or perhaps the the test subject isn't that suitable.
28 mm Lens Comparison, Center
Sample pictures of this group of lenses. The set-up is almost like at this standard lens comparison. The same chart for the border.
This chart consists of 140x170 px crops of a 7360x4912 px picture by a full frame sensor, taken from the center. As a reference, the exposure was taken from the Sigma lens at f/8, so every exposure for each lens was 1/60 s at f/8 and 1/125 s at f/5.6 and so on. Also the white balance was taken from this capture, to compare colors. The photos were taken with ISO 100 in JPG format, highest quality, without any picture "enhancement" like sharpening, saturation or noise reduction, the crop was directly taken from the ooc picture.
The focus was set manually with 16x magnification of the live view accurately onto the "4th Color Layer", the "Adox" box is just behind the Fuji box, the idea was to observe an increasing depth of field, but it was too large already at open aperture. The electronic shutter was used, the distance sensor to subject was 2,63 m.
The exposure is very constant, just the Sigma is too dark and the Pentax-M too bright. Obviously the aperture of the Pentax doesn't close correctly.
It is the first time I see that a lens has real trouble with center sharpness: you have to stop down the Hanimex HMC up to f/8 for a decent result. The Fujinon is also a bit soft wide open. The zoom lens doesn't show a good sharpness at every f-stop, but this very constant.
The leading group in my opinion is the Sigma, the Pentax-M and surprizingly the Hanimex Automatic. The Sigma is fine already at f/1.7, but you can see blurring caused by diffraction from f/16 on.
The 8-element Porst H has a tiny bit more contrast wide open than the the 6-element Porst F, otherwise the difference is negligible.
Surprizingly the chromatic aberration seems to be very well corrected for all lenses. Or perhaps the the test subject isn't that suitable.