Sergei Golyshev (AFK during workdays)
Laboratorium Solaris: breakthrough!
First test runs of hybrid H-alpha-continuum solar imaging system :)
Left - the setup in operation. The shot is Photomatix-fused HDR of three subexposures of 1/250, 1/60 and 1/15 seconds taken with Canon 60D through EF-S 17-55 f/2.8 IS USM @17 mm f/14.
Right - full-disk image of the Sun @07.06.2015 11:15 MSK taken through Meade 6000 (EFR = 960 mm, f/12). 6 panels of 180/1000 frames, stacked, deconvolved, wavelet-sharpened and manually stitched in PS using difference blending. ICE failed :(
Inset right - H-alpha fulldisk taken through piggy-backing PST with DMK23 (400 mm, f/10). 180/1000 frames, deconvolution, high-pass filtering. Orientations of images are matched.
Some considerations and observations.
1) I thought QHY5L-IIm would be good for white-light imaging of the Sun. Nope. The images show distracting vertical banding of obviously electronic nature. I'll give it yet another chance but I have doubts.
Upd: defocussed flat-field image clears the stripes very effective.
2) All these look imposing but it is effectively 20 kg so I have dismounted PST and gave it personal mounting plate. Advantage: now both tubes work with the same small counterweight - I just need to move it along the shaft when remounting.
3) Use of 2x Barlow lens gives 2,1 pixels per the unit of resolution - 1,75 arcseconds here.The use of 2,5x lens would be just fine for Nyquist sampling.
4) Cameras have difficulties reaching the focus without use of Barlow lens on 6000. Even with the diagonal. But I think that the empty casing of Meade Barlow would make a good extension tube.
Upd: proven!
Laboratorium Solaris: breakthrough!
First test runs of hybrid H-alpha-continuum solar imaging system :)
Left - the setup in operation. The shot is Photomatix-fused HDR of three subexposures of 1/250, 1/60 and 1/15 seconds taken with Canon 60D through EF-S 17-55 f/2.8 IS USM @17 mm f/14.
Right - full-disk image of the Sun @07.06.2015 11:15 MSK taken through Meade 6000 (EFR = 960 mm, f/12). 6 panels of 180/1000 frames, stacked, deconvolved, wavelet-sharpened and manually stitched in PS using difference blending. ICE failed :(
Inset right - H-alpha fulldisk taken through piggy-backing PST with DMK23 (400 mm, f/10). 180/1000 frames, deconvolution, high-pass filtering. Orientations of images are matched.
Some considerations and observations.
1) I thought QHY5L-IIm would be good for white-light imaging of the Sun. Nope. The images show distracting vertical banding of obviously electronic nature. I'll give it yet another chance but I have doubts.
Upd: defocussed flat-field image clears the stripes very effective.
2) All these look imposing but it is effectively 20 kg so I have dismounted PST and gave it personal mounting plate. Advantage: now both tubes work with the same small counterweight - I just need to move it along the shaft when remounting.
3) Use of 2x Barlow lens gives 2,1 pixels per the unit of resolution - 1,75 arcseconds here.The use of 2,5x lens would be just fine for Nyquist sampling.
4) Cameras have difficulties reaching the focus without use of Barlow lens on 6000. Even with the diagonal. But I think that the empty casing of Meade Barlow would make a good extension tube.
Upd: proven!