{"closeOnBackgroundClick":true,"bindings":{"bind0":{"fn":"function(){$.fnProxy(arguments,\'#headerOverlay\',,\'\');}","type":"quicklookselected","element":".ql-thumbnail .Quicklook .trigger"}},"effectOnShowSpeed":"1200","dragByBody":false,"dragByHandle":true,"effectOnHide":"fade","effectOnShow":"fade","cssSelector":"ql-thumbnail","effectOnHideSpeed":"1200","allowOffScreenOverlay":false,"effectOnShowOptions":"{}","effectOnHideOptions":"{}","widgetClass":"OverlayWidget","captureClicks":true,"onScreenPadding":10}

 13 of 33 
Orion Telescopes
Meade 3" Field-Flattener for Series 6000 APO Refractors
Accepted Payment
In Stock
  • Minimizes field curvature in the edges of the field, providing pinpoint stars across the image
  • Designed for the 3" focuser of older Meade Series 6000 refractors
  • 48mm x 0.75mm wide t-thread connection on camera side
  • Optimal back focus requirement of 51.5mm
  • NOTE: does not work with the newer 2.5" focuser

Learn more
Item #  55821
Mfg Model #  07585

The Meade 3" field flattener, designed for photography with the Meade Series 6000 refractors that include the 3" Crayford focuser, flattens the focal plane for astro-imaging without affecting the focal length of the telescope. When imaging with a DSLR camera or dedicated CMOS astro camera, the far edges of the field of view will appear sharper when using the field flattener with your refractor telescope.

This 3" Field Flattener features M48x0.75 threads on the camera side, wider than the typical T-mount (M42), to minimize vignetting and provide better illumination of full-frame camera sensors. Thus, for DSLRs you will need an M48 DSLR adapter — a wider version of the standard T-ring. For dedicated CMOS astro cameras, which usually require less backfocus than a DSLR camera, you will need to add spacing as needed to fill the 51.5mm of required distance to the Field Flattener. M48 (2") spacers are available on the market separately.

The field flattener weighs 17.9 oz (507g), and the mechanical length added to the telescope when attached to the focuser is 89mm. Telescope-side threads measure 92mm x 1mm pitch, male. Camera-side threads measure 48mm x 0.75mm pitch, male. Please note this flattener is designed for the older 3" focusers. It will not attach to any refractor using the 2.5" focuser. Compatible telescopes include the Meade Series 6000 (versions with the 3" focuser), as well as the older Orion EON 115/130 which used the 3" focuser.


Limited Warranty against defects in materials or workmanship for two years from date of purchase. This warranty is provided by Meade for the benefit of the original retail purchaser only. For complete warranty details contact Meade at 800-626-3233.

  • Warranty
    Two year

Orders received by 1pm Eastern Standard Time for in-stock items ship the same business day. Order received after noon will ship the next business day. When an item is not in-stock we will ship it as soon as it becomes available. Typically in-stock items will ship first and backordered items will follow as soon as they are available. You have the option in check out to request that your order ship complete, if you'd prefer.


This product is available to ship Standard delivery within the 50 US states. Delivery is not available to US territories/protectorates or APO/DPO/FPO addresses. Delivery is available to Canada.

{"closeOnBackgroundClick":true,"bindings":{"bind1":{"fn":"function(event, startIndex, itemCount, newItems) { QuickLookWidget.assignEvents(newItems); $(\".Quicklook > .trigger\", newItems).bind(\"quicklookselected\", function(event, source, x, y) {\'#_widget776964205007\', event, source, x, y); }); }","type":"itemsloaded","element":".PagedDataSetFilmstripLoader > .trigger"},"bind0":{"fn":"function(){$.fnProxy(arguments,\'#_widget776964205007\',,\'\');}","type":"quicklookselected","element":".Quicklook > .trigger"}},"effectOnShowSpeed":"","dragByBody":false,"dragByHandle":true,"effectOnHide":"fade","effectOnShow":"fade","cssSelector":"ql-category","effectOnHideSpeed":"1200","allowOffScreenOverlay":false,"effectOnShowOptions":"{}","effectOnHideOptions":"{}","widgetClass":"OverlayWidget","captureClicks":true,"onScreenPadding":10}