Celestron C Series Telescope f/6.3 Reducer Corrector Review

Very satisfied. Easy to attach and works great. This is the Orion Nebula using this gear on a Celestron 6se. My first night of use. Matters, especially if you're trying to do any type of astrophotography.

I was skeptical that this would make much of a difference on my 1250mm Celestron scope. However, I was pleasantly surprised by the increase in brightness along with the larger field of view. I only wish I had bought one of these a long time ago.

If you are buying this for DSO photography, know that it will NOT be a flat field. You will have a coma that will get worse as you get closer to the edges. If you want a flat field with no coma with the SCT gear then you need to get the Starzona which are much more expensive.

Hello! I have an 8" CST and a native f/10 aperture. F/10 sucks the brightness out of any subject! If you are interested in seeing anything other than planets, I personally believe and have mathematically verified that 1st : 6.3 focus reducer is a must. My scope now steers! Improves "brightness performance" for absolutely every type and brand of eyepiece; math fact. This is a must for CSTs of any size when doing visual observations of the DSO want to enjoy.

The focus gear reduces the focal length of the telescope as expected. However, in combination with star diagonal, T-piece and Canon T3i, my Nexstar 8SE does not have enough play in the focus knob to bring subjects into focus. I had to replace the male portion of the tee with a shorter one to make it work. The Nexstar 8SE is a Celestron product, the Tee is a Celestron product and the Canon Rebel series is a very common DSLR used for astrophotography. I wish Celestron had tested compatibility…

I installed this on my Celestron 8se SC telescope to increase the field of view (because I have a zwo asi224mc camera with a relatively small sensor area). It was easy to install and worked pretty well. Before purchasing I was concerned that the focal plane would move so much that I would not be able to focus within the limits of my focus knob. But that fear was unfounded, and I had no trouble concentrating. I was able to get the Dumbbell Nebula into my camera's field of view with enough…

You get a nice bright and flat center, but the vignetting and curved stars at the edges are insane for the price you pay. I use this in the C8-XLT with Canon M50 ASP-C. I usually end up cropping out most of the image due to the curvature of the field at the edges. If it weren't for the extra brightness, I'd probably just stick with the original focal length and f-factor. I also use OAG and the stars in the OAG camera are curved too. To answer other questions, I have my back focus at exactly…

I read about such correction lenses in a book about astrophotography. The purpose of a lens is to effectively decrease the f-value of your scope and increase the aperture and field of view. This lens did both for my Celestron NexStar 6SE. He zoomed in from F10 to F6.3 and increased the FOV so that objects that were previously too large for the "whole" frame were now rendered in full. The visual brightness of objects increased, and the resulting exposure time decreased. I leave this lens on the…

My main motivation for purchasing was to get the sun (and moon) in the field of view of my APS-C (24 x 16mm) camera sensor using my Celestron 8" SCT (2000mm FL) and frame sensor is not possible because the C8 vignettes.This device also offers a slightly wider field of view and lower f-number for deep sky astrophotography.Handy reference numbers for those who want to photograph an eclipse or just the entire moon: APS-C camera is About 1260mm tall If using a full frame, about 1900. But only if…