The TPO 2" f/5 Focal Reducer will help to lower the focal ratio of your optics. The outside thread connection of M48 x 0.75 will fit most 2" eyepieces for visual use, too! Now you can connect your CCD camera and any 2" threaded camera adapter, just by using the TPO 2" Focal Reducer. Guess what? It even allows the connection of most 2" filters, too!
Third Planet Optics 2" f/5 Focal Reducer
- Additional Information
SKU OS-FR2 Manufacturer TPO Barrel Size 2" Warranty 2 Year Warranty
- Included Items
- TPO 2" Focal Reducer - 0.5X
- Questions & Answers
Product QuestionsQuestion by: The Dude and yes I abide on Oct 10, 2014 3:54:39 AMNo, this reducer is designed just for visual use or imaging on f/10 SCT's with very small CCD sensors. There is another TPO RC reducer which is designed to work with sensors up to 15mm in diameter on an f/8 RC telescope: http://www.optcorp.com/opt-field-flattener-focal-reducer-0-75x-2-rc-scopes.html.Answer by: Chris (Admin) on Oct 10, 2014 5:52:32 AMI have an AT6RC and an Orion G-3 color camera. Will this work or are there other Pt.#'s that will? I'd like to reduce this much if possible as F/9 is pretty tight on DSO's.Thank you!Question by: Ralph on Mar 6, 2017 7:01:00 PMThis might work due to the small size of the sensor on the G3 and the very flat field of the RC6, but the reducer will not work well if you ever get a camera with a larger sensor. A better bet long term would be the Astro-Physics CCDT67 (AP-CCDT67), which will cover up to an APS-C (28mm diagonal) sensor on that telescope, though with less reduction (0.67x vs 0.5x). With both reducers, you need an M48 female to either 1.25" nosepiece or T2 thread adapter to go between the reducer and the camera, and you can use either M42 or M48 spacers to vary the distance. The longer the distance between camera and reducer, the more reduction, but the smaller the corrected image circle and higher the distortion of stars at the edge of the field.Answer by: Chris Hendren (Admin) on Mar 16, 2017 9:26:00 AMShould the TPO focal reducer work well with the Orion ED80T CF Triplet Apochromatic Refractor Telescope?
Question by: Carlos on Sep 12, 2016 9:09:00 AMThis reducer was designed for ~f/10 Cassegrains with the reducer threaded directly onto the eyepiece. This cannot reach focus with a diagonal on the refractor you mention, and it is not designed for large sensors as it is not a reducer/flattener.Answer by: Chris Hendren on Sep 12, 2016 1:20:00 PMQuestion by: The Dude and yes I abide on Oct 9, 2014 4:06:29 AMThe manufacturer does not give any specifications, but given the fact that it is a reducer rather than a reducer-corrector the corrected field for imaging can't be larger than around 10-12mm when used on an f/10 SCT at ideal spacing, although the illuminated field is much larger. Adjusting spacing by moving the reducer closer to the camera will lessen the reduction but increase the illumination and image circle slightly.Answer by: Chris (Admin) on Oct 9, 2014 11:39:36 AMI just bought this reducer for my celestron 8sct
what do i need to connect to the back of the telescope for astrophotography(DSLR)?Question by: Erez Buyom on Dec 16, 2016 12:08:00 PMThis reducer is not a corrector, so while you can use it with your DSLR the stars will not be sharp all the way to the corners. You can help with this somewhat by focusing on a star off to one side in the frame rather than in the center to moderate the effects of field curvature, but you will likely have to crop the frame.
You will need at least two parts: an OS-ASCT2 to allow your telescope to accept a 2" diameter nosepiece (the focal reducer), and an M48 T ring, which both Sky-Watcher and StellarVue sell for Canon and Nikon and Sky-Watcher also has one for Sony A-mount. https://www.optcorp.com/catalogsearch/result/?q=sfft, https://www.optcorp.com/catalogsearch/result/index/?manufacturer=269&q=m48. You can also add other TPO M48 spacers between the focal reducer and the M48 T-ring to vary the spacing and magnification, but you will likely find that the image quality is better with the reducer closer to the camera (less reduction): https://www.optcorp.com/catalogsearch/result/index/?manufacturer=3007&q=m48.Answer by: Chris Hendren (Admin) on Dec 19, 2016 8:39:00 AMWhat is the length from center of reducer lens to imaging focal point for exactly 0.5x magnification? I see some that are 79mm and such. Just trying to figure out spacers. thanksQuestion by: DWKDiver on May 14, 2014 12:50:35 PMQuestion by: Ram Samudrala on May 30, 2016 4:29:00 AMThis reducer will not connect to the back of your telescope. However, it will attach to a 2" nosepiece on an eyepiece or camera, which can then be slid into a diagonal (which comes with the scope) or a 2" receiver adapter that you would need to purchase separately.Answer by: Chris Hendren on May 30, 2016 11:05:00 AMQuestion by: Curtis on Feb 20, 2016 12:28:00 PM
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