Thursday, 25 June 2020

Ha Full Disk 24th June


The sun is well, pretty much blank again!  This image whilst not perfect, as the focus shifts in the right hand side of the image, is useful as I think i've worked out that the focus shift is caused by the thumbscrews on the etalon cell being too tight and then pinching the tube and hence optics.  I've arranged a slightly different configuration and so are keen to try this out and see if it solves it.