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Meade f/3.3 Focal Reducer & Field Flattener for CCD Imaging
Meade's #07567 f/3.3 CCD Focal Reducer/Field Flattener converts f/10.0 Schmidt-Cassegrain telescopes to fast f/3.3 system, and a f/6.3 aperture scope becomes an astoundingly fast f/2.0! Ritchey-Chrétien f/8.0 systems convert to f/2.64 effective apertures. The device yields wider fields for imaging deep space objects and better color correction and edge resolutionas well, as effectively reducing exposure times by as much as 80%.
The Meade f/3.3 CCD Focal Reducer/Field Flattener attaches to the rear cell of Meade LX-Series Schmidt-Cassegrains, RCX400 Ritchey-Chrétiens and Celestron Schmidt-Cassegrains with apertures between 5.0-14.0". Your CCD camera attaches directly to the reducer using the supplied T-threads, due to the reducer's very minimal back focus. This is a concern; even adding a color filter wheel between reducer and camera usually adds excessive distance to retain reaching focus.
The variable T-adapter included with this device allows the choice of f/3.0 or f/5.0 focal ratios with f/10.0 Schmidt-Cassegrains, f/1.9 or f/3.2 focal ratios with f/6.3 systems, or f/2.4 or f/4.0 focal ratios with f/8.0 Ritchey-Chrétien designs.
- Multicoated 3-element (41mm effective clear aperture) optics maximize light transmission
- Compatible with all brands of CCD imagers & chip dimensions
- Yields spectacular wide-field results
- Rubber grip ring allows easy installation even when wearing gloves
- For CCD Use ONLY
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- Not used for visual observing
- Not used for 35mm astrophotography
- Not used for medium format astrophotography
REVIEW SNAPSHOT®
by PowerReviews(based on 1 review)
Ratings Distribution
REVIEWS
Reviewed by 1 customer
Displaying review 1
Pros
- Easy To Use
- Great Optics
- Widely Compatible Adapter
Cons
Best Uses
- Astrophotography
Comments about Meade f/3.3 Focal Reducer & Field Flattener for CCD Imaging:
I bought the f/3.3 FR to use primarily with a Meade DSI imager.
The FR works by pre-focussing the light cone to a point around 100mm from the rear cell of an SCT, so that the image comes to focus in a smaller area than it would at the default f/10.
This works best for small area CCDs such as the 9mm sensor in the LPI or DSI, and the FR isn't designed to be used for visual use, as due to that smaller light cone it would show a large amount of vignetting. For the same reason, it's also not usable for 35mm film astrophotography.
DSLR cameras using the inbuilt T-adaptor, but again if the image sensor is larger than around 10mm there will be vignetting. It worked on my Nikon D5000, but I had to crop the photos to the center un-vignetted area.
The FR comes as a kit with two different lengths of T2 tubing, so that the CCD camera can be moved within the light cone. Instructions are included with the kit, to use it at f/3.3 or f/5
Displaying review 1
System Extensions
- Price: $164.00
- GBP 104.71
What's in the Box
- Push-On Front & Rear Caps
- Plastic Case
- 1-Year Limited Warranty
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