I am not sure where to post this since it is not a CCD or film image.
While imaging with a Meade LX200 and the Canon 10D I experience REALLY bad vignetting. In this example of M51, without dark-frame subtraction, only 8 (of 45) - 1 minute frames have been stacked. I have already subtracted a radial gradient in PhotoShop and am left with what I call the "doughnut nebula" . The images where taken at 800iso. The effect shows up almost immediately once one- or two frames are stacked.
If anyone has experience imaging with the LX200 and 10D and has any suggestions as how to reduce/eliminate this effect within the setup; it would be appreciated. I am supposing I would either need to move the camera closer or futher.
Thanks in advance.
Brian Edgerly
While imaging with a Meade LX200 and the Canon 10D I experience REALLY bad vignetting. In this example of M51, without dark-frame subtraction, only 8 (of 45) - 1 minute frames have been stacked. I have already subtracted a radial gradient in PhotoShop and am left with what I call the "doughnut nebula" . The images where taken at 800iso. The effect shows up almost immediately once one- or two frames are stacked.
If anyone has experience imaging with the LX200 and 10D and has any suggestions as how to reduce/eliminate this effect within the setup; it would be appreciated. I am supposing I would either need to move the camera closer or futher.
Thanks in advance.
Brian Edgerly
Attached Image: