I’m afraid that I cannot speak knowledgeably about the auxiliary tele lenses by Moment or Sandmark, being more interested in the stronger, longer optical advantage offered by (I hope) digiscoping with my Celestron Regal spotting scope.

I’ve not a clue as to why the auxiliary long lenses don’t work with the iPhone12’s native camera, but can attest that the same applies to my spotting scope; it does, however, yield a nice, full-screen robust image when using any of the third party camera and raw camera apps.

As for why I use the Lightroom Mobile app for pp? I’m just used to Lightroom! I’ve played a bit with Snapseed and am impressed with it, but I suppose that Snapseed is just too much of a new trick for this old Lightroom dog.

Why do I use the third party app? Because I am far more comfortable with manual control of raw exposure with the third party raw camera app than I am with the native camera...AND for the ease of using an auxiliary long lens with my iPhone!.

ALSO... I find that the third party apps considerably facilitate use of EBTR (exposure beyond the right) to assure use of my iPhone’s full “overhead” raw dynamic range for capture of maximum possible image data quality ( S:N ratio and tonal spectrum) with the 1X and 2.5X cameras.

I do hope all this is more helpful than confusing!

Best regards,
Dave

Hi, Dinah:
First? Let me list those third party raw camera apps I have tried(mostly with iPhone11ProMax and fewer with iPhone12ProMax)

All offer a camera for raw capture with iPhones.
LightroomMobile offers a raw camera as well as in-camera raw post processing; I use it for convenient in-camera pp.

Here’s the list:
HalideMarkIi
Lightroom Mobile*
ProCamera
Moment
ProCam
645*
PureShot*

•the ones I use

I’ve tried them all and they all claim to have an “intuitive” interface. IMO that all depends upon who is doing the intuiting!

I’ve settled on Pure Shot and 645 (from same developers) for several reasons:
I’m 81 and have hand tremors, and I find the “stepper” adjustments of ISO and shutter duration easier to control on the touch screen than the “slider” controls the others use. Also I like the “exploded” R,G, B,Luminosity histograms very useful as well as the steady replicability of onset of the “zebra” warning of when you begin using the “overhead” extra dynamic range beyond the “rated” DR used for 8 bit Jpeg exposures. Also, the user manuals for PureShot and 645 are (in my personal opinion) far and away the most lucid and well organized user guides of any offered for the other raw camera apps.
I keep Lightroom Mobile strictly for pp; it offers no in-camera histogram and its zebras seem a bit less replicably reliable than those of PureShot and 645. It’s histogram for editing is excellent.

The above is just one guy’s take on some of the raw apps available. Try a few; what’s “intuitive” to you may not have been so to me!!!

Hoping all this may have been some help.

Watch this space; I have just begun evaluating the raw camera app “Camera Pixels” ...could be promising?

Best regards,
Dave

Moment lenses. I haven't used them but a photo journalist friend uses several of them in her work. They seem to have the least impact on image quality, although they are pricey. This is one situation where you should not count price in your decision - you'll want to get the best available.

As is always the case, there are those who cannot wrap their heads around the fact that cellphone cameras are significan, REAL cameras used to capture video and stills in a wide variety of casual and professional settings. They don't get it and probably never will.