Hello, I have a 4" f10 TAL cell mounted in a aluminum Celestron tube with a very nice 2.7" format rotating focuser (similar to Astro Physics). This scope produces a fantastic star check pattern. It does have some color on very bright objects. Most of the color can be overcome with a -violet type filter. I have a Williams 2" VR-1 I will sell with the scope for $75. All items are in great shape. Thanks for looking.