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Nope. But there is now in Lightroom 6/CC. You can merge photos via HDR and get a DNG file (not a dang bit map). You can also now do a pano merge and get a DNG result!

If you used Aperture, move on to Lightroom 6/CC where you can now do HDR and panos inside and do round trips to lots of plugins like Photoshop, Pixelmator, Topaz Labs, Nik, and Perfect Photo Suite.
 
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