{"product_id":"rouz-astro-fast-oag-conversion-kits-ock","title":"Rouz Astro Fast – OAG Conversion Kits (OCK)","description":"\u003ch1 class=\"product_title entry-title\" data-mce-fragment=\"1\"\u003eRouz Astro Fast – OAG Conversion Kits\u003c\/h1\u003e\n\u003cp class=\"price\" data-mce-fragment=\"1\"\u003e \u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/Capture_f2832e7d-34ea-4c2f-aa54-1263917d77f6_480x480.jpg?v=1686926206\" alt=\"\" width=\"490\" height=\"563\" style=\"display: block; margin-left: auto; margin-right: auto;\" data-mce-fragment=\"1\" data-mce-src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/Capture_f2832e7d-34ea-4c2f-aa54-1263917d77f6_480x480.jpg?v=1686926206\" data-mce-style=\"display: block; margin-left: auto; margin-right: auto;\"\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003c\/p\u003e\n\u003cdiv class=\"product_meta\" data-mce-fragment=\"1\"\u003e\n\u003cp\u003eThis kit modifies the imaging train of the Planewave CDK telescopes (CDK 12.5 – CDK14 – CDK17) to enable the use of an Off-Axis Guider (OAG) in conjunction with the Planewave 0.66x focal reducer to achieve a fast focal ratio, a much wider field of view, and autoguiding capability.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eFeatures:\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eOff-axis guiding\u003c\/li\u003e\n\u003cli\u003eFast focal ratio: f\/4.5 ~ f\/5.25.\u003c\/li\u003e\n\u003cli\u003eLarger field of view: approximately 1.5 degrees\u003c\/li\u003e\n\u003cli\u003eHigh resolution imaging with an image scale of 0.36 ~ 0.47 arcseconds\/pixel\u003c\/li\u003e\n\u003cli\u003eMono full-frame camera with filter wheel support\u003c\/li\u003e\n\u003cli\u003ePrecision focus and instrument rotation\u003c\/li\u003e\n\u003cli\u003eConverted back to native in minutes\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eArticle on testing and performance found\u003cspan\u003e \u003c\/span\u003e\u003ca href=\"https:\/\/astrogeartoday.com\/a-large-fast-astrograph-planewave-cdk14-with-a-custom-imaging-train\/\" title=\"\" target=\"_blank\" data-mce-href=\"https:\/\/astrogeartoday.com\/a-large-fast-astrograph-planewave-cdk14-with-a-custom-imaging-train\/\"\u003ehere\u003c\/a\u003e.  \u003c\/p\u003e\n\u003ch2\u003ePerformance Test\u003c\/h2\u003e\n\u003cp\u003ePerformance tests performed on the same night with native vs reduced configuration.\u003c\/p\u003e\n\u003cp\u003eThe Soul Nebula was was imaged for 10x600seconds at a longer native focal length with a very fine image scale and then the system was switched to the shorter focal length configuration and the same target was imaged again for 10x600seconds (about 2 hours).\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch4\u003eFOV Difference:\u003c\/h4\u003e\n\u003cp\u003e\u003cimg alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/2_e2f79579-cb81-4b37-9cb9-f3264353ed7e_480x480.gif?v=1686928147\" width=\"596\" height=\"402\" style=\"display: block; margin-left: auto; margin-right: auto;\" data-mce-src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/2_e2f79579-cb81-4b37-9cb9-f3264353ed7e_480x480.gif?v=1686928147\" data-mce-style=\"display: block; margin-left: auto; margin-right: auto;\"\u003e\u003c\/p\u003e\n\u003ch4\u003eIncrease in Brightness:\u003c\/h4\u003e\n\u003cp\u003eMoving from f\/7.2 to f\/4.75 increases the brightness over 200%.\u003c\/p\u003e\n\u003cp\u003e\u003cimg alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/2_b3ffd20e-d5eb-49d9-8d5f-511d72fdbfcc_480x480.jpg?v=1686926942\" width=\"577\" height=\"297\" style=\"display: block; margin-left: auto; margin-right: auto;\" data-mce-src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/2_b3ffd20e-d5eb-49d9-8d5f-511d72fdbfcc_480x480.jpg?v=1686926942\" data-mce-style=\"display: block; margin-left: auto; margin-right: auto;\"\u003e\u003c\/p\u003e\n\u003cp\u003e \u003cbr\u003e\u003c\/p\u003e\n\u003ch4\u003eSpeed – Integration Time:\u003c\/h4\u003e\n\u003cp\u003eHaving the brighter images with the reducer allows using much less integration time. Below is a comparison 10x600s at native  –vs– 6x600s with the reducer.\u003c\/p\u003e\n\u003cp\u003eBoth visual and Pixinsight SNR script verify the results.\u003c\/p\u003e\n\u003cp\u003e\u003cimg alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/Untitled_480x480.gif?v=1686928306\" width=\"580\" height=\"455\" style=\"display: block; margin-left: auto; margin-right: auto;\" data-mce-src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/Untitled_480x480.gif?v=1686928306\" data-mce-style=\"display: block; margin-left: auto; margin-right: auto;\"\u003e\u003c\/p\u003e\n\u003ch4\u003eWhat About Loss of Resolution for Imaging Smaller Targets?\u003c\/h4\u003e\n\u003cp\u003eBelow is side by side of 10x600s at the native focal length, then swapped to the reducer setup on the same night. The object will be smaller but the here we unsampled 150% in Pixinsight and there was\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eno loss in resolution\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eeven though the target was much lower by then.\u003c\/p\u003e\n\u003cp\u003e\u003cimg alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/2_719f93ce-e918-4de0-83cf-db350b756945_480x480.gif?v=1686927939\" width=\"641\" height=\"433\" style=\"display: block; margin-left: auto; margin-right: auto;\" data-mce-style=\"display: block; margin-left: auto; margin-right: auto;\"\u003e\u003c\/p\u003e\n\u003cp\u003e \u003cbr\u003e\u003c\/p\u003e\n\u003ch4\u003eResolution Test at Same Altitude:\u003c\/h4\u003e\n\u003cp\u003eIt didn’t seem fair to compare the reducer images at a lower altitude than the native. Below is a comparison with the reducer images taken the next night at the same altitude of the native images. Also 10 x 600s. To match the image scale, the reducer image was unsampled 150% in Pixinsight. The image is actually sharper with smaller FWHM with the reducer.\u003c\/p\u003e\n\u003cp\u003e\u003cimg style=\"display: block; margin-left: auto; margin-right: auto;\" height=\"390\" width=\"560\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/1_a67d42e5-fafa-4010-9660-07c850ce399a_480x480.jpg?v=1686928416\" alt=\"\"\u003e\u003c\/p\u003e\n\u003ch2\u003eDual Focal Length – Native Swap\u003c\/h2\u003e\n\u003ch4\u003eDual focal length setup to return back to native in minutes by swapping one part.\u003c\/h4\u003e\n\u003cp\u003eThis allows the user to swap back to the native focal length configuration in minutes.\u003cspan\u003e \u003c\/span\u003eThe procedure involves loosening three set screws, releasing the reducer from the OAG, and replacing the reducer with another custom machined part that maintains the original native focus position.\u003c\/p\u003e\n\u003cp\u003eThis component has a dovetail connection that simply plugs into the OAG with the camera on the other end. The focuser and OAG don’t need to be altered.\u003cspan\u003e \u003c\/span\u003eInternal baffles ensure stray light and reflections are eliminated.\u003c\/p\u003e\n\u003cp\u003e\u003cimg style=\"display: block; margin-left: auto; margin-right: auto;\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/Capture_406d4317-f7f0-4141-9d80-fc92c270f889_480x480.jpg?v=1686928477\" alt=\"\"\u003e\u003c\/p\u003e\n\u003ch2\u003eWhy?\u003c\/h2\u003e\n\u003cp\u003eThe majority of these CDK telescopes used sensors like the Kodak 16803 that had large 9 micron pixels and sensors. The resulting native image scale of 0.6~0.7 arcseconds\/pixel was in the sweet spot for resolution and good signal to noise ratio buildup.\u003c\/p\u003e\n\u003cp\u003eWith today’s modern low noise CMOS cameras like the Sony IMX571 and IMX455, the smaller 3.76 micron pixels often lead to oversampling at a native image scale of about 0.3″\/pixel. Oversampling comes at the cost of requiring a lot more integration time to build up high signal to noise ratio. \u003c\/p\u003e\n\u003cp\u003eThe resulting image is much brighter than the native one – about 240%. Image resolution is still very high at 0.37~0.46 arcseconds\/pixel (depending on CDK model). Since the system will be oversampling in almost all cases, there is no loss in true resolution. A “larger” image of small targets can be produced simply by upsampling the already sharp reducer image. \u003c\/p\u003e\n\u003cp\u003eThe field of view (FOV) is limited given the smaller sensors. The dedicated Planewave focal reducer allows smaller sensors to capture a much larger field of view, thus reducing the overall cost associated with large cameras, filters, and filter wheels.\u003c\/p\u003e\n\u003cp\u003eIncorporating an OAG into the system means no more guiding and tracking errors regardless of the sub exposure length, type of mount, lack of encoders, or perfect polar alignment.\u003c\/p\u003e\n\u003cp\u003e \u003cimg style=\"display: block; margin-left: auto; margin-right: auto;\" height=\"547\" width=\"763\" alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/1_d6bb8617-0256-4952-833b-443fd794f8ce_480x480.jpg?v=1686928535\" data-mce-fragment=\"1\" data-mce-src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/1_d6bb8617-0256-4952-833b-443fd794f8ce_480x480.jpg?v=1686928535\"\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cdiv class=\"wp-block-media-text__content\"\u003e\n\u003ch2\u003eHow?\u003c\/h2\u003e\nThe dedicated Planewave focal reducer only allows 44~47mm of spacing between the reducer and the camera sensor.\u003c\/div\u003e\n\u003cdiv class=\"wp-block-media-text__content\"\u003eWith mono-cameras that require a filter wheel, there isn’t enough space to add an OAG as well.\u003c\/div\u003e\n\u003cdiv class=\"wp-block-media-text__content\"\u003eThe\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eRouz Astro Fast-OAG CDK conversion kit\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003ewas developed after extensive design and testing with several CDKs and focusers. This configuration positions a large OAG before the Planewave reducer to find guide stars for autoguiding the telescope.\u003c\/div\u003e\n\u003cdiv\u003e \u003c\/div\u003e\n\u003cp\u003e\u003cimg height=\"266\" width=\"548\" style=\"display: block; margin-left: auto; margin-right: auto;\" alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/2_70d1f017-b1f2-4ccb-ad0f-6b3704d7fd3f_480x480.jpg?v=1686928653\" data-mce-fragment=\"1\" data-mce-src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/2_70d1f017-b1f2-4ccb-ad0f-6b3704d7fd3f_480x480.jpg?v=1686928653\"\u003e \u003cbr\u003e\u003c\/p\u003e\n\u003ch2\u003eDesign \u0026amp; Manufacture\u003c\/h2\u003e\n\u003cp\u003eThe modification calls for several custom CNC machined adapters that position all the optical and mechanical elements at very specific positions.\u003c\/p\u003e\n\u003cp\u003eExtensive testing has been done to compile charts and graphs that allow calculating adapters and spacing that are unique to each\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eTelescope – Focuser – Camera\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003ecombination.\u003c\/p\u003e\n\u003cp\u003eEach system can be designed with custom components and to fit the users requirements.\u003cimg height=\"219\" width=\"626\" style=\"display: block; margin-left: auto; margin-right: auto;\" alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/3_01ef2a4c-e347-4ad0-8f0f-f8211e26ae4d_480x480.jpg?v=1686928684\" data-mce-fragment=\"1\" data-mce-src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/3_01ef2a4c-e347-4ad0-8f0f-f8211e26ae4d_480x480.jpg?v=1686928684\"\u003e\u003c\/p\u003e\n\u003cp\u003e \u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003eTolerances need to be to accurate to the millimeter from the focal reducer’s output flange to the camera sensor. This can be fine tuned by 0.1mm by user.\u003c\/p\u003e\n\u003cp\u003eDistance from the telescope backplate to the input of the reducer is also critical, which in turn varies as the camera spacing is altered.\u003c\/p\u003e\n\u003cp\u003eFurthermore, provisions are needed to position the guide camera at a specific position which is dependent on the other spacing values above.\u003c\/p\u003e\n\u003cp\u003eGuide camera adapters and components are provided with the kit. Some suitable guide cameras are the ZWO ASI174mm or the ASI432MM tested with this kit\u003cspan\u003e \u003c\/span\u003e\u003ca href=\"https:\/\/astrogeartoday.com\/a-planetary-camera-for-long-focal-length-guiding-zwo-asi432mm-review\/\" target=\"_blank\"\u003e\u003cstrong\u003ehere.\u003c\/strong\u003e\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003e \u003cimg height=\"554\" width=\"492\" style=\"display: block; margin-left: auto; margin-right: auto;\" alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/4_5be9ae3a-4529-49cb-b80e-bd0972336905_480x480.jpg?v=1686928720\" data-mce-fragment=\"1\" data-mce-src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/4_5be9ae3a-4529-49cb-b80e-bd0972336905_480x480.jpg?v=1686928720\"\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003ch2 class=\"wp-block-media-text__media\"\u003eFocuser\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli class=\"wp-block-media-text__content\"\u003eThe\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eOptec Gemini focuser\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003ecan be incorporated into the design as it has a very low profile and offers excellent performance as well as instrument rotation.\u003c\/li\u003e\n\u003cli class=\"wp-block-media-text__content\"\u003eThe Planewave IRF90 can work with some telescopes, so can can the standard Hedrick 3.5″ focuser.\u003c\/li\u003e\n\u003cli class=\"wp-block-media-text__content\"\u003eThe Standard Hedrick 2.75″ is \u003cstrong\u003enot\u003c\/strong\u003e suitable for the CDK12.5 conversion kit.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cimg height=\"543\" width=\"447\" style=\"display: block; margin-left: auto; margin-right: auto;\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/5_d738cf35-ec14-411a-a8d1-7cf347a3da9d_480x480.jpg?v=1686928755\" alt=\"\"\u003e\u003c\/p\u003e\n\u003ch2\u003eCosts\u003c\/h2\u003e\n\u003cp\u003eEach CDK model has specific spacing requirements, one design does not fit all. Custom adapters are designed, CNC machined, anodized, with internal surfaces treated with super anti-reflective acrylic.\u003c\/p\u003e\n\u003cp\u003eDesign and consultation is project dependent:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eCustom Design with all CNC machined Parts Ready To Assemble 2,450~$2,850  (depending on options)\u003c\/li\u003e\n\u003cli\u003eSeveral options available for focusers, the Optec Gemini is recommended and can be supplied. Lower cost version is possible with Optec Leo. \u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eRouz Astro is an Authorized\u003cspan\u003e \u003ca href=\"https:\/\/rouzastro.com\/product-category\/optec\/\" target=\"_blank\"\u003e\u003cstrong\u003eOptec\u003c\/strong\u003e\u003c\/a\u003e \u003c\/span\u003eDealer. Required Optec parts will be supplied with the kit. \u003c\/h4\u003e\n\u003cp\u003ePlease use the contact form to get in touch for a quote.\u003c\/p\u003e\n\u003cp\u003e \u003cbr\u003e\u003c\/p\u003e\n\u003ch2 style=\"text-align: center;\"\u003eSee Sample Images Beside\u003c\/h2\u003e\n\u003ch4 style=\"text-align: center;\"\u003eTaken with the Rouz Astro “Fast” OAG imaging train on the CDK14\u003c\/h4\u003e\n\u003c\/div\u003e","brand":"Rouz Astro","offers":[{"title":"Default Title","offer_id":44110468907237,"sku":"ROZ-OCK","price":0.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/rouz-astro-fast-oag-conversion-kits-ock-astronomy-plus-1.png?v=1690491126","url":"https:\/\/istronomyplus.com\/products\/rouz-astro-fast-oag-conversion-kits-ock","provider":"Astronomy Plus – Telescopes \u0026 Astrophotography Canada","version":"1.0","type":"link"}