Hello,
For long time ago ... I tested the different focussing tool in SharpCap with my Sol'Ex.
Only the "Contrast (Edge) Detection" was working.
But I did not use it regularly after my tests. One reason is the field of view of the camera lens of the Sol'Ex has some field curvature.
The optimum focus (in the case of full sun disc) is not at the edge of the sun disc (and not in the centre) but in an intermediate position.
But ... you can still use it with some shift of the sun disc at the optimum position.
Robin, yes, the spectrum lines are the curved "horizontal" lines with the wavelength direction vertically (short = down and long wave = up).
The vertical lines on the image are coming from dark sun spots or some dust on the slit.
For the observation with a spectrometer ... you need to set 3 different focuses.
1. the collimator lens (between the slit and the grating), 2. the camera lens (between the grating and the camera),
and finally the telescope focus on the slit.
The contrast tool could be used for the camera lens and the telescope. But for the focus of the camera lens, I always set a strong defocus of the telescope before doing the focus of the camera.
For my SharpCap SHG capture script, a motorised focuser can be used at different position during one single capture.
The INTI processing software can generate a "static" image. I can explain more if wanted.
Regards,
Jean-Francois
Note:
New feature request ... FWHM measurement on a line (ideally working on a curved line too
)
