I have used NightCap with my iPhones for NV photos since 2018, but earlier this year, I became a beta tester for a new iPhone camera app called AstroShader (AS). It is available in the App Store for free. The developer has done a lot of work to create it and continues to make improvements, with 5 updates since last November. Where NightCap averages multiple 1 second photos over a user-selected period of time, AS does the same, but then takes it a step further, by aligning and stacking multiple averaged images, automatically, within the app. AS also has some powerful editing tools for processing the image on the phone. Results are quite good, but take a little longer to produce than NightCap.
Essentially, AS is an EAA app for phones, but is made much more powerful with NV. Here are two image examples, both taken with NV in prime focus with my 8" f:4 Newt with a 2x Barlow lens element ahead of the NV sensor, making it an f:8 system, and iPhone 12 ProMax attached to the NV ocular. For these two images, I used an ISO of 974, with a stack of 60 - 5s subs. Processed in AS, cropped in Photos on the phone. So all processing was done on the phone. Original images were saved to PNG (with file size of ~25MB), processed and then saved as a JPEG (~2MB) to save space. I also took photos of M81-82 and M65-66. All came out quite good, requiring very little processing. The images below were severely compressed to fit here and are each less than 50 KB, so much of the detail is lost to post here. In the original PNG images, the dust lane in front of NGC 4565 is quite distinct with visible structure.
The AS app isn't perfect... yet. Stars are not always well aligned, resulting in some star bloat or elongation, but detail on complex structure is often revealed better than NightCap. I still prefer NightCap for globulars, and I have yet to use AS with NV for nebulae, but that will come with summer nights.
NGC 4565 Needle galaxy
M51 Whirlpool galaxy
Edited by GeezerGazer, 19 April 2023 - 02:22 AM.