Takahashi TOA130R Reducer - Discontinued -
Takahashi TOA-130 RD Reducer
The Takahashi TOA-130 RD Reducer is ready to make your Takahashi TOA-130 turn into the fast focal ratio you want for your most demanding astrophotography needs. Just put this focal reducer into place on either the 2.7" or 4" focuser and instantly transform your system into an f/5.76!
The Takahashi TOA130R Focal Reducer measures 2.7" in diameter and was designed with 35mm photography and large chip CCD astrophotography (35mm format) in mind. It fits focuser of all 2.7" focuser TOA-130 optical tube assemblies as well as the Takahashi FS-102, FS-128, TSA-102S. With the addition of a 4" to 2.7" adapter, the Takahashi TOA130R Focal Reducer is also compatible with the 4" focuser focuser design of the Takahashi TOA-130 and 150. The TOA130R is fully threaded to match all accessories.
How does the Takahashi TOA130R Focal Reducer work? Like all Takahashi optics, it begins with high quality, fully multicoated glass and changes the focal length of an f/8 to f/6 - even on older model telescope. At the same time, it also produces a flat field image, fully unvignetted, and will crisp, perfect stars to right out to the edge of space. As a finishing touch, Takahashi has also provided fully threaded metal covers to help protect both threads and optics!
Takahashi Product Number: TOA130R
|Warranty||5 Year Warranty|
Useful for medium sized detectors
This reducer/flattener is useful up to the (nowdays medium sized detectors that are full frame 35mm size (~43mm diagonal dimension. Vignetting becomes rather severe for any larger detector. It does not reduce vignetting compared to using the scope without it (a previous review is incorrect in that regard, but it does improve the field flatness. For larger detectors you must use the 67 flattener, and then you can achieve a larger actual field than is possible with this reducer.
A must for imaging with TOA/TSA/FS scopes
This reducer is specifically matched for Takahashi's triplet TOA-130 and TSA-102 scopes but will work well on an FS-102 or FS-128 as well. This has the dual benifit of acting as a 0.75x reducer (taking the TOA-130 to f/5.7 or the TSA-102 to f/6.0 - which increases photographic speed and cuts necessary exposure times by almost 50% - and a CCD/35mm flattener yeilding an image cirlce of 50mm. For comparison, a 35mm film plane or SBIG STL-11000 CCD chip both have diagonals of 44mm, meaning that both will be flat to the corners. Depending on sky darkness and chip size, some vignetting will occur, but much less than the same scope without the reducer.