请问各位老师这支镜头中心到边缘衰减严重吗

施耐德SA 75 5.6实拍。上面两张柯达2460正冲，下面是foma100正冲。

右下角的裸镜，几乎无渐晕。
左下角的ND1000, 边角有渐晕。
右上角的YG黄绿滤镜, 渐晕明显。
左上角的ND1000+YG黄绿滤镜, 渐晕十分很明显了。

手机翻拍观片台上的4张底片，无后期。


iliyi42 编辑于 2026-04-01 13:48

要，但不是必须要。PS可以调过来，就是麻烦点。曝光过一点，以免边缘欠曝太多丢失细节。

好像不需要吧

58以下的头才要哈

58以下的，不上渐变镜也能拍，就是四角暗一点

这张是施耐德SA47XL镜头拍的，6X9的后背移轴，顶部我还特地PS了渐变，压暗了天空光，如果是4x5的片子应该会有暗角，这种镜头自身四角渐变不是突然变暗的，不像超出有效成像圈的那种断崖式变暗，应该可以接受

我有渐变镜，但没装，觉得影响画质，暗角正好压低天空光


这张是蔡司6X9三剑客之一的53mmF4.5Biogon镜头拍的，这个镜头应该也没有配渐变灰滤镜一说，不过这个镜头超级大，像圈却刚刚够6X9，像圈虽然不大，但是确实四角比较亮，可能这就是牛头的道理吧

另外，镜头光圈设得小一点，像圈会变大，四角变暗的情况会改善，大光圈肯定不行

问了一下万能的AI, 结论是反转片要，负片和黑白不用。

“Whether a Schneider Super-Angulon 75mm f/5.6 requires a Center GND (Center Filter) depends on the film type, subject matter, and how critical you are about light fall-off (vignetting) at the edges, rather than a hard "yes" or "no".

Here is the breakdown of when you need one:
Slide Film (Color Reversal): Yes, strongly recommended. Slide film has narrow exposure latitude, making the natural, gradual light fall-off of wide-angle lenses very apparent.Color Negative / Black & White: No, usually not needed. These films have wider latitude, and the fall-off can often be corrected during printing or scanning.Architectural/Even Tones: Yes. If your image has clear sky or smooth, bright walls at the edges, the vignetting will be noticeable.Landscape/Complex Textures: No. The natural fall-off often goes unnoticed in busy scenes.  
Key Considerations for the 75mm f/5.6:
Light Fall-off Nature: The lens experiences a gradual decrease in light towards the corners rather than a sudden drop.Movements: Using extreme movements (rise/shift) will make the fall-off unpredictable and more noticeable.Alternatives: You can dodge the edges in the darkroom or correct it in post-processing rather than buying an expensive, hard-to-find filter.”