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8se拍摄的m27，减焦和未减焦对比
Photographer
黄河大堤
买了个最便宜的减焦镜，星缘0.63x，实际试了一下效果很一般，几乎没有平场效果，减焦后解析出来是1500mm焦距，实际也就0.75x
Equipment
Camera533mcpro
Telescope/Lens8se
Mount蛙牌ft20
Shooting Data ( Shooting Date: 2026-07-11 )
Total Frames无减焦的300s*24张，加减焦的300s*9张
ExposureN/A
Sky Coordinates
Right Ascension (RA)19h 59m 38.8s
Declination (Dec)+22° 43′ 13.9″
FOV Radius0.3017° (18.10′)
Pixel Scale0.511″/px
Rotation Angle290.52° E of N (Clockwise)
Parity镜像
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