Astro-Physics 0.75X Photographic-Visual Telecompressor

Astro-Physics 0.75X Photographic-Visual Telecompressor (focal reducer). It reduces the native focal length of the system on which it is used by 0.75 times. For instance , a F/6 refractor will be transformed in to a faster F/4.5 optical system. If you photograph at prime focus with a 35 mm camera on a 130mm f/6 refactor, you will achieve a 1.7 x 2.4 degree field. If you use this telecompressor, the field size increases to 2.3 x 3.3 degrees at f/4.5. This greatly increases the versatility of your refractor for imaging a wide variety of objects.

This well-corrected accessory lens preserves the high contrast and superb color correction of the main objective. While the telecompressor flattens the field to a certain degree, you may still notice some slightly elongated stars in the corners. This is less of an issue with CCD imaging when the chip size is smaller than a 35 mm negative.

For further info about this reducer we suggest to take a look at the data sheet you can find in the download tab.