Optec NextGEN MAXfield 0.33X Reducer
The Optec NGM (Next Generation MaxField) telecompressor increases the effective speed of the Meade and Celestron Schmidt-Cassegrain telescopes from f/10 to f/3.3. This 3 fold reduction in focal length allows for 9 times greater field area and 1/9 reduction in exposure time for extended surface objects such as bright nebulae. The system is optimized specifically for f/10 Schmidt-Cassegrain telescopes to allow for the correction of field curvature and spherical chromatism that afflicts these types of instruments. At f/3.3, the maximum corrected field has a diameter of 9 mm at the image plane which makes the unit suitable for CCD cameras with imaging chips of the same diagonal dimension or smaller.
The optical design of the Optec NextGEN 0.33X was done with Zemax and optimized for four field points using wavelengths of 450, 550 and 650 nm. The goal was for the smallest blur diameters for the four field points. The system was modeled using the actual optical prescription for an SCT with the inherit aberrations of this telescope. The resulting lens curvatures of this design was made without adjusting the radii to the optical lab's tool list. Custom tools were made for all surfaces.
You will need to order a NEXGEN CCD Mounting Plate in order to attach this telecompressor to your CCD camera. Choose from a selection of mounting plates listed in the "Accessories" tab to your left.
If you do not see the mounting plate for your CCD camera, or you have any questions, please feel free to contact our Internet Sales Department by email or by phone at 1-800-483-6287. Thanks!
Photo shows the SCT mount and CCD Camera Mount, both of which are sold separately.
Optec Product Number: 17403
- Additional Information
SKU OP-17403 Manufacturer Optec Barrel Size 2" Warranty 1 Year Warranty
- Included Items
- Optec NextGEN MAXfield 0.33X Telecompressor Lens
- Violet Rejection Filter
- Questions & Answers
Product QuestionsWhat adapter is required to use Optec NextGEN MAXfield 0.33X with ZWO ASI178MC cooled? I do not understand the relation between camera back focus & length of the Optec adapter tube:
in this table the length of the adapter tube does NOT match the camera back focus given by manufacturer of the camera.Question by: Paul on Jan 10, 2016 9:02:00 AMThe key information for figuring the adapter length is this note right above the chart: Add the tube length, which is equal to 2.39 - BF, with BF measured in inches. The back focus of the ASI178MC cooled is 12.5mm or 0.49", so the appropriate adapter length would be 1.90" and you would use the 17392 prefix for a T2 thread camera. The closest off-the-shelf adapter they make is the 17392-1.89 for the Atik 314L+. This should be close enough (0.25mm tolerance), but please contact us if you wanted to pursue a custom 1.90" adapter.Answer by: Chris Hendren (Admin) on Jan 11, 2016 4:49:00 PMQuestion by: John Denny on Mar 29, 2015 10:41:00 AMYes, this will work, but you will need Optec part OP-17399-1.90. This is a special order item and is not on the website, though the cost is $60 and the shipping will be the same as for this item http://www.optcorp.com/optec-nextgen-mount-plate-any-standard-c-mount-camera.html (The 17399-1.69 is too short for the Lodestar X-2 but has the correct thread). Please contact us if you wish to order this part.Answer by: Chris Hendren (Admin) on Mar 31, 2015 1:06:00 PMHi Chris:
I have a optec reducer 0.33X and I want to use it with SCT 9.25" with moonlite mortorized focuser and ST-9XME with CFW8. The CFW has only narrow band filters that avoid to get a star for guiding, and I need to use my sbig remote guide head with a OAG.
Can I to use a OAG with this reducer and CCD?
What kind of AOG need I?
I have the old celestron OAG Can I to use it?
how is the setup of this image train?
Question by: Angel Llanas on Aug 30, 2016 7:56:00 AMHello Angel. Unfortunately, you cannot use this reducer with the SBIG ST-8 and CFW-8. The 0.33x reducer will only cover a 9mm diameter field (your sensor is 16mm across) so you will see distortion on your CCD and will not be able to use the guide CCD at all. You can just barely get to the right distance with a OP-17392-0.67 adapter if you remove the D-block from the end, but you would need a separate guidescope and guide camera. You would be much happier with the 0.5x version, which at least covers an 18mm circle (you would still need a guidescope, though.Answer by: Chris Hendren on Aug 31, 2016 11:39:00 AMQuestion by: Peter Mueller on Oct 2, 2015 9:51:00 AMUnfortunately, the Optec NextGen reducer is intended to be used only on a standard SCT, meaning that it will not work properly on an EdgeHD telescope because the spacing will be wrong for the telescope's rear flattener (which will cause the field to not be flat at the camera). The only option currently for very fast imaging with an EdgeHD is the Hyperstar.Answer by: Chris Hendren on Oct 2, 2015 11:02:00 AM
- Support / Downloads