SkyWatcher S20204 Quattro Coma Corrector (Black)

I had to return the original coma corrector because it appeared that the box had been opened and the product used, based on scratches it had on the edge of the corrector and the open plastic bag it came in. I purchased another version and it arrived perfectly fine. I know that some products are sold as "previously opened" (or something like that) and come with a notation to that effect. This original order did not indicate that was the case. I urge all buyers to carefully examine the box before using in case this happens to you.

While the price tag will give you pause, when it comes to astrophotography… you get what you pay for in many scenarios. The construction of the FF is of good quality, it is threaded on the end to accept 2” filters, and for DSLRs…the M48 Canon or Nikon adapter is required, which Skywatcher has available here (Amazon). The M48 adapter and FF combined achieve 55mm back focus needed for DSLR. I have uploaded a “first light” capture using the field flattener with the SW Quattro 200P Newtonian. The image is a single RAW, 60 second exposure, ISO 1600, shot with a Canon Rebel T4i modified, mounted on an Explore Scientific EXOS2-GT PMC-8.

If you have a Quattro. This is the coma corrector you want. Its not designed expressly for a range of focal ratios (though it will work), its designed for your f/4. Perfectly round stars all the way to edge of frame, though I did have to dial in the back focus first.