Contax 135mm f/2.8 MM lens test (3x enlargement) : 無料・フリー素材/写真
Contax 135mm f/2.8 MM lens test (3x enlargement) / s58y
| ライセンス | クリエイティブ・コモンズ 表示 2.1 |
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| 説明 | Contax 135mm f/2.8 MM lens test (3x enlargement)Subject: Gamma Cygni area Date: 2011/06/19Exposure: single 15-second exposure, ISO1600, f/2.8Filter: NoneCamera: Unmodified Canon T2i (550D)Lens: Contax 135mm f/2.8 MM (Carl Zeiss Sonnar 2,8/135 T*)Mount: Astro-Physics AP900Guiding: no guiding (15 second exposure is only 2-3 times the usual guiding interval)Processing: No calibration. Raw conversion to TIFF in Images Plus.Gamma set to 2.2 using levels in Photoshop. A 360 by 240 pixel area from each corner and another 360 by 240 pixel area from the center were combined in Photoshop and enlarged 3x using "nearest neighbor" mode to show the individual pixels enlarged 3x. Conversion to JPEG using quality 10. No other processing. Remarks: Temp 56F, RH 81%; SQM-L reading 18.92 (bright moon)Using a fine printed scale with 6 marks per millimeter and high power magnifying glass, focus was obtained to the nearest 1/12mm (83 microns) on the focusing ring using full-length 15-second test shots. The shot with the sharpest focus at the center is shown in this test. There was no attempt to focus 1/3 or 2/3 of the way out on the sensor. |
| 撮影日 | 2011-06-19 01:00:00 |
| 撮影者 | s58y |
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