Nothing really is spectacular it seems. The MZ 7-14/2.8 is good enough accept
at 7mm. If doing astro, AF is a blessing as starry sky AF is so consistently
good.
https://www.dpreview.com/articles/9708502215/go-wide-a-look-at-four-top-ultra-wide-primes-for-micro-four-thirds
The PL 9/1.7 is quite small and not bad. If one looks at the raw files with a
converter that doesn't process the imbedded corrections, it has a ton of barrel
distortion!
There are very few astro images with it to be found so not sure how the
converters correct the distortion and whether they stretch the stars in corners
or not.
I've never seen a coma analysis using a converter that doesn't do the
corrections.
https://www.lenstip.com/641.7-Lens_review-Panasonic_Leica_DG_Summilux_9_mm_f_1.7_ASPH_Coma__astigmatism_and_bokeh.html
https://www.lenstip.com/465.7-Lens_review-Olympus_M.Zuiko_Digital_7-14_mm_f_2.8_ED_PRO_Coma__astigmatism_and_bokeh.html
It looks better than the MZ zoom at 7mm but that is the weakest focal length
for distortion with that lens.
OM systems needs to get off their duff and optimize a UWA prime for such use
since the cams are so durn easy to use for this application.
No wings on my stars please, Mike
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