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If you’re a Nebulosity v3 user who’s migrating to v4, there are a number of new features to be aware of. First, if you bought v3.0 and never upgraded through v3.1, 3.2, and 3.3, you missed out on a number of new features (remember, all upgrades within a major version – v1, v2, v3, v4, etc. are free!). You missed out on:
• Native support for a number of new cameras for both Windows and Macs
• Enhancements to the scripting tool (focuser commands, TEC commands, etc.)
• Screen overlays to aid in composition
• New language translations
• Control for external focusers
• Enhanced GUI during Align and Combine (lets you pick a “master frame”, censor frames, etc).

In v4, we’ve got more new goodies (some of which were in v3 pre-releases)
• New percentile-based stacking modes to reject noise, planes, hot pixels, etc.
• New synthetic flat tool to remove gradients and vignetting
• Ability to link to FocusMax v4 for auto-focusing (Windows)
• Ability to use Nebulosity as it were an ASCOM Camera, so other programs can script and control Nebulosity’s captures.
• Can now name filters for both on-camera and external filter wheels and have multiple saved sets. Can even have “short names” used in filenames.
• Can use these filter names, series index number, and capture time in any combination you like when capturing a series (Preferences).
• Complete rewrite of the dialogs / GUI to work well with variable system font sizes and Retina / High DPI screens
• Simplified camera TEC / filter control into a single control
• Optionally have the image capture routines run in a separate “thread” so that USB or camera issues won’t lock up Nebulosity
• Support for Atik cameras greatly enhanced with the One’s filter wheel supported on both Mac and Windows and with most all Atik cameras now supported on the Mac (thanks Nick!).
• For Mac users, I can no longer say 10.6 is fully-supported. Too many libraries Nebulosity depends on just can’t run on 10.6 anymore. 10.7 is the new official minimum version.
• For Windows users, 32-bit versions of the OS (e.g., XP) are still supported but this has been now called “deprecated” meaning it is slated to go away down the road. You’re fine for now, though.