gustavodamatta2003
Orion Constellation using a Schneider-Kreuznach Xenon 25mm f/0.95 in a Fuji APS-C sensor camera
Extreme conditions: periodic clouds, light pollution from the streets LED lamps, a lens developed to a small sensor attached in a camera with larger sensor, producing strong vignetting (1-inch sensor lens in an APS-C Fuji's camera), severe post-processing crop and so forth.
In the previous test with this lens the result is very bad in my opinion but in that time I didn't do a good review.
In Adobe Camera RAW the histogram was in the extreme right side in the base ISO 200 (exposure to the right) although the aperture two f-stops closed (from f/0.95 to f/2) and 8 seconds exposure time.
Of course, a lot of light came from urban area, including that one reflected by the clouds.
In the stacking process I have utilized only 25 frames without calibration ones.
The image result was clean!
The severe crop have solved the problem about the strong vignetting - the area of the sensor where no light is present - and star aberrations near the borders no compromising the image quality significantly.
The base ISO provided better star colors and we can distinguish the orange and blue stars in the image.
Conclusions:
Schneider-Kreuznach Xenon 25mm f/0.95 is a "jewel" in terms of optics.
The only flaw is not related to the lens but to the camera sensor size unespecific to it.
Probably I will have better results in a camera with 1-inch sensor size ou smaller (2/3 inch for example).
Lens distorsion is very low compared to other ones with the same or similar focal length.
Star aberrations have the same pattern of the urban lights at night street photography. In fact, aesthetically is very bad in f/0.95 even at the center of the image. In an one-inch sensor this condition won't be different. Unusable!
Targets as Barnard's Looping is very difficult in these climate conditions and urban area with severe light pollution.
Probably in a darker area, distant from the urban center, the colors of this nebula would can be bring in the post-processing easily.
Veredict: Wonderful lens in the specific sensor to which it was developed.
Orion Constellation using a Schneider-Kreuznach Xenon 25mm f/0.95 in a Fuji APS-C sensor camera
Extreme conditions: periodic clouds, light pollution from the streets LED lamps, a lens developed to a small sensor attached in a camera with larger sensor, producing strong vignetting (1-inch sensor lens in an APS-C Fuji's camera), severe post-processing crop and so forth.
In the previous test with this lens the result is very bad in my opinion but in that time I didn't do a good review.
In Adobe Camera RAW the histogram was in the extreme right side in the base ISO 200 (exposure to the right) although the aperture two f-stops closed (from f/0.95 to f/2) and 8 seconds exposure time.
Of course, a lot of light came from urban area, including that one reflected by the clouds.
In the stacking process I have utilized only 25 frames without calibration ones.
The image result was clean!
The severe crop have solved the problem about the strong vignetting - the area of the sensor where no light is present - and star aberrations near the borders no compromising the image quality significantly.
The base ISO provided better star colors and we can distinguish the orange and blue stars in the image.
Conclusions:
Schneider-Kreuznach Xenon 25mm f/0.95 is a "jewel" in terms of optics.
The only flaw is not related to the lens but to the camera sensor size unespecific to it.
Probably I will have better results in a camera with 1-inch sensor size ou smaller (2/3 inch for example).
Lens distorsion is very low compared to other ones with the same or similar focal length.
Star aberrations have the same pattern of the urban lights at night street photography. In fact, aesthetically is very bad in f/0.95 even at the center of the image. In an one-inch sensor this condition won't be different. Unusable!
Targets as Barnard's Looping is very difficult in these climate conditions and urban area with severe light pollution.
Probably in a darker area, distant from the urban center, the colors of this nebula would can be bring in the post-processing easily.
Veredict: Wonderful lens in the specific sensor to which it was developed.