{"product_id":"zwo-d32-ar-protective-window","title":"ZWO D32 AR Protective Window","description":"\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eThe \u003cstrong\u003eZWO D32 AR Protective Window\u003c\/strong\u003e is a \u003cstrong\u003e32 mm\u003c\/strong\u003e replacement window for ZWO ASI cameras. It is \u003cstrong\u003e2 mm\u003c\/strong\u003e thick — nearly double the 1.1 mm of the smaller D21 and D25 windows — figured to \u003cstrong\u003e1\/4 λ flatness\u003c\/strong\u003e, and carries an \u003cstrong\u003eanti-reflective coating\u003c\/strong\u003e. It sits directly in front of the sensor and seals the sensor chamber against dust and humidity.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eZWO produces the D32 in AR only.\u003c\/strong\u003e There is no D32 UV IR-cut window. If you need IR-cut on a D32-bodied camera, it has to happen in the imaging train — see the limitations below.\u003c\/p\u003e\n\n\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eThis is a good match if you own a \u003cstrong\u003eD32-bodied ASI camera\u003c\/strong\u003e — the ASI1600, ASI294, ASI183, ASI533, ASI585, ASI990, or ASI991 series — and need to replace a window that is scratched, fogged, or contaminated beyond cleaning.\u003c\/p\u003e\n\u003cp\u003eBecause there is no IR-cut alternative in this diameter, this is simply \u003cstrong\u003ethe\u003c\/strong\u003e window for these bodies rather than a choice between two coatings.\u003c\/p\u003e\n\n\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e32 mm diameter, 2 mm thick:\u003c\/strong\u003e the D32 form factor, covering ZWO's 4\/3\" and 1\" class sensors\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAnti-reflective coating:\u003c\/strong\u003e reduces reflection losses and internal glare at the window surfaces, a common origin of halos around bright stars\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOptically clear:\u003c\/strong\u003e passes UV and IR straight through — all wavelength control happens in your imaging train\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1\/4 λ flatness:\u003c\/strong\u003e the window sits in a converging beam directly ahead of the sensor, so surface figure feeds straight into star shapes\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e2 mm substrate:\u003c\/strong\u003e thicker glass than the D21 and D25 windows, matched to the larger clear aperture\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDust and humidity seal:\u003c\/strong\u003e the window is the sensor chamber's only physical barrier\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eReplacing a scratched or contaminated window\u003c\/strong\u003e on an ASI1600, ASI294, ASI183, ASI533, ASI585, ASI990, or ASI991\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMonochrome deep-sky imaging\u003c\/strong\u003e, where a filter wheel handles all wavelength selection anyway\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNarrowband imaging\u003c\/strong\u003e, where you want no extra coating shaping the passband\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInfrared and methane-band planetary imaging\u003c\/strong\u003e, which requires infrared to reach the sensor\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOne-shot-colour imaging\u003c\/strong\u003e with a UV\/IR-cut filter carried in a drawer, wheel, or threaded ahead of the camera\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMatch models:\u003c\/strong\u003e ASI1600 series, ASI294 series, ASI183 series, ASI533 series, ASI585 series, ASI990 series, and ASI991 series\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eASI585 Air is not included\u003c\/strong\u003e in the D32 match list — ZWO calls that exception out specifically\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDiameter is not interchangeable:\u003c\/strong\u003e D32 fits 32 mm bodies only. Smaller planetary bodies take the D21 or D25; ASI6200 \/ ASI2400 \/ ASI2600 take the D60\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNo IR-cut option in this size.\u003c\/strong\u003e Carry a UV\/IR-cut filter in a ZWO filter drawer or filter wheel instead\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNo installation direction:\u003c\/strong\u003e ZWO confirms the window has no preferred orientation, so the coating works either way round\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReplacement procedure:\u003c\/strong\u003e see ZWO's official guide, \u003ca href=\"https:\/\/i.zwoastro.com\/wp-content\/uploads\/2025\/12\/c36da643469647ac8334179b49aa8b11.pdf\" target=\"_blank\" rel=\"noopener\"\u003eHow to Replace the Camera Protective Window\u003c\/a\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMechanical part only\u003c\/strong\u003e — no electronic function, no camera communication\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003e\u003cstrong\u003eImportant Limitations\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eThis window does not cut UV or IR\u003c\/strong\u003e, and ZWO does not make a D32 that does. On a one-shot-colour camera behind a refractor with nothing in the train, infrared will focus at a different point than visible light and soften the image. Put a UV\/IR-cut filter in your train\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNot a threaded filter.\u003c\/strong\u003e It is a bare optical window that only works installed inside the camera body\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReplacement means opening the sensor chamber.\u003c\/strong\u003e Dust introduced during the swap lands on or near the sensor — work in still, clean air\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFits 32 mm bodies only\u003c\/strong\u003e, and not the ASI585 Air. Check your camera against the list above before ordering\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSold as a single window.\u003c\/strong\u003e No tools, gaskets, or retaining ring included\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003e\u003cstrong\u003eFrequently Asked Questions\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eWhich cameras use the D32 AR window?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe ASI1600, ASI294, ASI183, ASI533, ASI585, ASI990, and ASI991 series. The ASI585 Air is excluded.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs there a D32 UV IR-cut window?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eNo. ZWO makes the D32 in AR only. If you need IR-cut on one of these cameras, use a UV\/IR-cut filter in a filter drawer or wheel ahead of the camera.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhy is this window 2 mm thick when the D21 and D25 are 1.1 mm?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe larger clear aperture needs a thicker substrate to hold its figure. Keeping 1\/4 λ flatness across 32 mm takes more glass than across 21 mm.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDoes the window have to face a particular direction?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eNo. ZWO confirms there is no specific installation direction.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eMy ASI1600 window is scratched — can I just leave it out?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe camera will focus and operate without it, but the sensor chamber is then open to dust and humidity, which is a far worse problem than the scratch. Replace it.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eI have an ASI585 Air. Does this fit?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eNo. ZWO excludes the ASI585 Air from the D32 match list even though other ASI585-series bodies are included. Check before ordering.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWill this fit my ASI2600 or ASI6200?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eNo. Those bodies use the 60 mm D60 window. This is 32 mm.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs this good for beginners?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe part is simple; fitting it is not, since it means opening the sensor chamber. If you are not confident working clean, have it done rather than risk dust on the sensor.\u003c\/p\u003e\n\n\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eIn short: a 32 mm × 2 mm anti-reflective window at 1\/4 λ flatness — the only protective window ZWO makes for the ASI1600, ASI294, ASI183, ASI533 and ASI585 bodies. There is no IR-cut version in this diameter, so plan on a UV\/IR-cut filter in your train if you shoot one-shot-colour.\u003c\/p\u003e","brand":"ZWO Optical","offers":[{"title":"Default Title","offer_id":53804465782895,"sku":"D32-2-AR","price":35.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/f8fc754efe2799ca917eee21d7350efd_560cc259-2914-4c06-9428-4b4114c23ba7.jpg?v=1784083596","url":"https:\/\/ontariotelescope.com\/products\/zwo-d32-ar-protective-window","provider":"Ontario Telescope and Accessories","version":"1.0","type":"link"}