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Status: Sold  Ad Category: Optics-Lens  Ad # 43256
Teleskop-Service 4-element Reducer/Flattener 0.79x (Red279)
This Photoline 4-element FR/FF based upon the Riccardi reducer design is the best I've used. It is very versatile, correcting refractors from 350-800mm focal lengths (see table below). It is the only reducer/flattener I have found that does a great job correcting my 60mm f/5.5 doublet (a particular challenge) but it does equally well with my 90mm f/7 triplet by adjusting the spacing. I'm only selling because I bought the newer version (TSRed279) that has an additional M54x0.75 male thread on the barrel so that I can thread it into the 2" focuser on my SV60EDS scope to eliminate any tilt, which is particularly critical at f/4.3. Wear and tear on the outside consistent with a used optical element but the glass is perfect.

You can calculate postage from V2M 7B9 on the Canada Post website. I prefer Interac Money transfer or PayPal.


Description of the Red279 on the TS website:
See https://www.teleskop-express.de/shop/product_info.php/info/p10025_TS-Optics-PHOTOLINE-2--0-79x-Reducer-4-element-for-Astrophotography.html (note however that the picture on the website is the TSRed279; the Red279 does not have the M54 thread on the barrel)

TS Optics Reducer and Corrector for astrophotography through APO refractor telescopes

- Reduction of the focal length 0.79x - exposure time goes to 62%
- 4-element design for very good field correction
- Easy telescope adaptation with 2" nosepiece
- On the telescope side M48x0,75 female thread for 2" filters
- Easy camera adaptation via T2 - M42x0.75
- Perfect definition and field illumination for cameras up to 30 mm sensor size
- Optimal for high resolving sensors and DSLR cameras (APS-C)

Back Focus - distances from the T2-thread to the camera sensor
depends on the focal length of the telescope:

- Focal Length to 350 mm .... 70 mm
- Focal Length to 420 mm .... 65 mm
- Focal Length 450-500 mm ... 61 mm
- Focal Length 510-600 mm ... 58 mm
- Focal Length 610-700 mm ... 57 mm
- Focal Length 710-790 mm ... 56 mm
- Focal Length from 800 mm .. 55 mm
Price: $195
Posted on: 2018-02-07 19:24:20
Last Updated on: 2018-02-13 16:24:56
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