【求助】JEOL2100F做明（暗）场象时出现的一个难以解释的奇怪现象

我估计是像聚焦的问题....

有图片吗?上传一张看看。

检查一下光栅是不是真的已经收好了

没遇见过这种情况，拍一张片子吧

是不是 成像模式 的那一按键老化了，没有转换回Mag模式。

It is a really strange phenomenum. But the strange image was on screen or on CCD image?
we had some experiences that when the intensity of TB(transmitted beam) was too strong, there was some residual intensity on CCD image.
If the image was on screen, that is unreasonable. The function of the "image" button is to choose the focal length of the intermediate len between image and backfocal planes(DP).