Originally posted by planteater For several years I've used my K30 (together with a Sigma 150-500 and DIY solar filter) to take pictures of sunspots. Today I tried the K-70 using the Pixel Shift feature. I wasn't expecting much as I assumed the resolution of the lens was the limiting factor. However, the results are WAY better than I ever achieved with the K30 - not sure how to explain this.
Nice. I am a professional solar physicist, so I appreciate your efforts. Can you tell us more about your solar filter?
It would be interesting to try pixel-shift with a much longer lens; well, actually, with an amateur astronomical telescope. However, the real limiting factor would be "seeing", i.e., atmospheric turbulence. No matter how high your resolution, you won't get past this. Modern large professional solar telescopes such as the
Swedish Solar Telescope on La Palma use adaptive optics to keep this in check. Or we go to spacecraft to avoid it altogether. These are out of amateur reach of course, but it certainly is nice to see what can be achieved with a humble Pentax DSLR.