{"product_id":"baader-planetarium-m68-tilter-0-1-image-correction","title":"Baader Planetarium M68-Tilter (0 - 1° image correction)","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eCorrects for sensor tilt and optical train misalignment\u003c\/li\u003e\n\u003cli\u003eProvides a 0° to 1° tilt adjustment range\u003c\/li\u003e\n\u003cli\u003eAdds a minimal 9.5 mm to 10.25 mm of optical length\u003c\/li\u003e\n\u003cli\u003eFeatures M68 x 1 threads for large-format imaging systems\u003c\/li\u003e\n\u003cli\u003eEnables sharp, round stars across the entire image field\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eM68-Tilter (0 - 1° image correction)\u003c\/h2\u003e\n\u003cp\u003eThe M68-Tilter provides up to 1° of precise image plane correction, resolving sensor tilt within a minimal optical length of 9.5 mm to 10.25 mm. Designed for large-format sensors using the robust M68 thread standard, this component allows you to achieve perfectly round, pinpoint stars across your entire field of view, eliminating the frustrating distortions caused by mechanical misalignments.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eAchieve Pinpoint Corner Stars: 0 to 1° of Precise Tilt Correction\u003c\/h3\u003e\n\u003cp\u003eIn a perfectly aligned imaging train, your camera sensor is exactly perpendicular to the light path. However, minor flexure in a focuser, tiny machining tolerances in adapters, or the camera's own mounting can introduce a slight tilt. This results in elongated stars in one or more corners of your image, even when the center is in perfect focus. The M68-Tilter provides a 0 to 1° adjustment range, allowing you to make micro-corrections to the sensor angle, ensuring the entire focal plane is sharp and your stars are tight and round from edge to edge.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eRobust M68 Integration with a Minimal 9.5mm Optical Path\u003c\/h3\u003e\n\u003cp\u003eBuilt around the M68 x 1 thread standard, this tilter offers a wide, unvignetted aperture suitable for full-frame and larger sensors. Unlike smaller M48 or M54 accessories, the M68 connection ensures that your large sensor is fully illuminated. Critically, the tilter adds only 9.5 mm of optical path length at its zero position, making it easier to integrate into imaging trains with tight backfocus requirements, such as those using reducers or coma correctors. As you introduce tilt, the length increases to a maximum of 10.25 mm, a factor to consider in your final spacing calculations.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I identify sensor tilt that the M68-Tilter can fix?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYou can identify sensor tilt by examining a well-focused image of a dense star field. If stars in the center of the frame are sharp and round, but stars in one or two corners appear elongated or out-of-focus, you likely have tilt. The M68-Tilter is designed to correct this specific aberration by physically adjusting the sensor's angle relative to the optical axis.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the M68-Tilter suitable for my imaging setup with a full-frame camera and an f\/4 reflector?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, absolutely. Fast optical systems like an f\/4 reflector are extremely sensitive to any misalignment, making tilt a common problem. The M68 thread standard is ideal for full-frame sensors, as it provides a large clear aperture that prevents vignetting, ensuring your entire sensor receives an unobstructed cone of light.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow is the M68-Tilter adjusted?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAdjustment is an iterative process that involves taking short test exposures and making small corrections between them. You would typically use a star analysis tool in your imaging software, or careful visual inspection, to check for improvements in corner star shape after each adjustment until the entire field is sharp.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDoes using the M68-Tilter change my backfocus?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The tilter itself occupies physical space in your imaging train. You must account for its optical length, which is \u003cstrong\u003e9.5 mm at 0° tilt\u003c\/strong\u003e and increases to \u003cstrong\u003e10.25 mm at 1° tilt\u003c\/strong\u003e, in your overall backfocus calculation. Minor focus adjustments will be necessary after correcting for tilt.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy choose an M68-Tilter over a smaller M48 or M54 version?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe M68 thread provides a significantly larger clear aperture compared to M48 (48mm) or M54 (54mm) threads. This is essential for preventing vignetting (darkening of the corners) on large sensors, such as full-frame (36x24mm) or medium format, ensuring even illumination across the entire imaging chip.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy does the optical length of the M68-Tilter vary from 9.5 mm to 10.25 mm?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe base optical length is 9.5 mm when the tilter plates are perfectly parallel (at 0° of tilt). As you introduce an angle to correct the image plane, one side of the plate separates slightly more than the other. This increases the overall optical length, reaching a maximum of 10.25 mm when the unit is at its full 1° of tilt.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eNet weight (kg)\u003c\/td\u003e\n\u003ctd\u003e0.09\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompatible Brands\u003c\/td\u003e\n\u003ctd\u003eBaader Planetarium\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOuter Diameter\u003c\/td\u003e\n\u003ctd\u003e92\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eType of Adapter\u003c\/td\u003e\n\u003ctd\u003eCamera Adapter\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical length (mm)\u003c\/td\u003e\n\u003ctd\u003e9.50-10.25 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOuter Connection (eyepiece\/-camera-sided)\u003c\/td\u003e\n\u003ctd\u003eM68 x 1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInner Connection (lens sided)\u003c\/td\u003e\n\u003ctd\u003eM68 x 1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAdapters Family\u003c\/td\u003e\n\u003ctd\u003eM68 System\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/baader-planetarium-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eBaader Planetarium 2-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Baader Planetarium","offers":[{"title":"Default Title","offer_id":52913173823773,"sku":"BAA-2458170","price":308.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/BaaderPlanetarium-M68-Tilter-0-1-image-correction-1_07a8ba05-e5e9-4a75-aa50-6a937036447b.jpg?v=1789087168","url":"https:\/\/davidastro.com\/en-us\/products\/baader-planetarium-m68-tilter-0-1-image-correction","provider":"David Astro","version":"1.0","type":"link"}