C6+0.63reducer 有黑角
C6+0.63reducer 有黑角
點解用C6+0.63reducer+40D 影相會有黑角?
是否T-adapter長度不合
有無好建議?
是否T-adapter長度不合
有無好建議?
鄧登凳 寫:Let me try such a combination with my ASC DSLR and tell you whether there is significant vingetting later.cwlam 寫:
I use meade 4000 0.63x reducer/flattener...
Probably, doing a flat-field adjustment as Skyobs suggested may help.
Attached the photos showing the "暗角" problem... any suggestion to minimize the problem?
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I intend to try some without the camera extension tube or without the visual back. But I am not sure whether that will solve the problem.
However, with direct t-mount to C6, I remember there was not that much vingetting as in your second photo.
Apparently, the brightness of the vingetted area may be adjusted by taking some "flat-field" photographs (I think pointing to the grey sky without "the floating ball " and the roof-top will do) and than use photo-editing software to adjust the brightness according to the "flat-field" photos.
However, with direct t-mount to C6, I remember there was not that much vingetting as in your second photo.
Apparently, the brightness of the vingetted area may be adjusted by taking some "flat-field" photographs (I think pointing to the grey sky without "the floating ball " and the roof-top will do) and than use photo-editing software to adjust the brightness according to the "flat-field" photos.
Sorry that there is much delay in testing this.
Two photos all with Celestron 6 SCT and Sony Alpha, (1) 0.63 reducer using original visual back and 1.25 inch t-ring nose. More vingetting (黑角). (2) 0.63 reducer but 2" extension tube and 2" t-ring nose. Some but less vingetting.
Suggestion: Use a 2 inch connection system and use flat field to correct remaining vingetting.
Two photos all with Celestron 6 SCT and Sony Alpha, (1) 0.63 reducer using original visual back and 1.25 inch t-ring nose. More vingetting (黑角). (2) 0.63 reducer but 2" extension tube and 2" t-ring nose. Some but less vingetting.
Suggestion: Use a 2 inch connection system and use flat field to correct remaining vingetting.
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