Celestron factor 0.63x focal reducer

The Celestron four lens focal reducer has multiple uses which will be very useful for both observation and astrophotography, especially in the deep sky. It will reduce the focal length of our Schmidt-Cassegrain optical tube by a factor of 0.63, varying the aperture ratio in the same way from 1:10 to 1: 6.3. Consequently, we obtain a greater visual field and reduced exposure times by factor 3 . In addition, the Celestron focal reducer acts as a corrector by flattening the field of view of Schmidt-Cassegrain curved optical tubes. In this way, we will have a completely corrected field of vision free of vignetting of 24 mm in diameter.
Applying the previously described theory, we observe how the focal lengths of Celestron SC telescopes vary:

• SC 5 "(C-5): 1250 to 788 mm / f6.3
• SC 8 "(C-8): 2000 to 1260 mm / f6.3
• SC 9 "(C-9): 2350 to 1480 mm / f6.3
• SC 11 "(C-11): 2800 to 1764 mm / f6.3
• SC 14 "(C-14): 3910 to 2463 mm / f6.3

The Celestron focal reducer can obtain an important utility also visually and its coupling is very simple thanks to the fact that it has SC threads on both ends and must be mounted directly on the telescope tube. It can also be used in combination with the Radial Guider or Off-axis Guide in photography and for CCD cameras.