P: Horizontal flip, opens upside down after "Edit In Photoshop"

It's safer to shoot raw + JPEG. That way if you have some image files with clipped shadows or highlights you can use the raw file with Nikon Capture NX-D to recover them. Then export the raw files to JPEG and rotate using any other photo editor that has that capability. Make sure to use a high JPEG Quality setting like 100% in the Capture export settings since you'll be resaving the file after the flip (i.e. compression artifacts) When you resave it the 2nd time you can use a lower quality setting like 80% and over-write the current file. Send those files to your friend. Once completed you can delete the raw files.

What photo editing software are you using now?

Once again, thanks so much. From what you say it might be safer to shoot just in RAW. I can then make high quality JPEGS from the RAW file? (sorry for such a basic question).  Just downloaded Nikon Capture NX-D. So far, I see it will rotate RAW images, but, at least so far, I don't see the ability to flip the image horizontally. Odd, to me, if its not included. Is there an easy way to do this flipping...ideally without paying for an expensive program? 

"If I use RAW, Ill need a RAW image processor, in other words a more complex program, to manipulate the images, though I frankly dont plan to do much, other than flipping them horizontally at this point."

This post is a discussion on using Lightroom Classic and I wrongfully assumed that's what you were using. Concerning the emulsion direction you are correct in that it should be facing away from the camera (senior moment) which will prevent the need to flip horizontal. Does that make sense now?

Concerning the camera settings you'll need to test it for yourself using the auto focus and auto exposure settings and see how consistent focus and exposure are in the camera files. Concerning lighting I use an electronic flash (Canon 270EX) set to a fixed 1/16 output with 1/200 shutter speed, which is the fastest usable flash sync speed.

Concerning raw vs JPEG raw provides more exposure latitude, since no processing is applied to the image data. Slide film (Especially Kodachrome) uses a very high contrast emulsion, which is designed for use with a slide projector. This can cause camera JPEG files to have areas of the image pushed into both black and white clipping, which is not recoverable. What can help if you want to shoot JPEG only is to set the camera's picture style to a lower contrast setting like Camera Neutral. Again, raw file format provides more latitude and ability to recover shadow and highlight areas that would otherwise be clipped in the JPEG image file. You'll need to test it with a variety of slides to see how well it works. 

Here's a Luminous Landscape article Mark Segal and I wrote on scannerless capture using a digital camera. It focuses on negative film, but may still be of interest.

https://luminous-landscape.com/articleImages/CameraScanning.pdf

While Im at it I might as well ask.... Im digitizing 600 slides of a friends professional artwork. How will these images be used in the future? Not entirely sure. Is "safest" method to shoot RAW files, in that "anything" can be done with them in the future? Or, would a high resolution jpeg be sufficient. From my limited exploration, manipulation of the jpeg seems easier, even the photo app in Windows can flip images, crop etc. If I use RAW, Ill need a RAW image processor, in other words a more complex program, to manipulate the images, though I frankly dont plan to do much, other than flipping them horizontally at this point. RAW "safer"? Thanks

Very helpful. Thank you. I see, RAW may be sufficient. Numerous instructional vids have said emulsion towards camera, but that necessitates a horizontal flip to get to original orientation, as far as I know at this point.  I'm also debating, use autofocus + autoexposure (hey, I paid for the latest processor) or, as some vids say, strive for a shot at f8 and iso 100 (using Autofucus A and limiting the ISO range)....though this seems (even with lume cube on highest setting) to give me a shutter speed thats so slow I dont know, for certain, it will stop any camera shake. Thoughts? Thanks again.

A couple of points, which may be helpful. If you position the slide with its emulsion facing the camera facing away from the camera there is no need to flip the image files. Also why are you shooting raw + JPEG? The LrC processed raw file with your adjustments, keywording, rating, etc. can be exported to JPEG file format.

To flip horizontal the raw and JPEG files you've already imported select all of them and in the Develop module's bottom right panel click on the switch next to the Sync button (Auto Sync). Then go to menu Photo and click on Flip Horizontal. You can also use CTRL/CMD + S to save the orientation data to the JPEG file, but LrC only writes this metadata to an XMP sidecar for the raw file. Place the Auto Sync switch in the off (Sync) position to stop further auto syncing. 

Hello. Can I ask a, perhaps, only somewhat related question. I'm new to shooting RAW + jpeg images. I'm duplicating slides with my Nikon z50. After shooting, I need to flip them horizontally. Does anyone know if there is a way, preferably an easy way, to horizontally flip the RAW + jpeg at the same time, maintaining their size and maintaining a RAW + a jpeg image? My windows photo program flips the jpegs but not the RAW, or, if it flips the RAW, it converts then to jpegs. Any easy way to flip both at the same time, preferably with the same program? Thanks a lot!!!