Milky Way - 32mm f/1.4 - (PIC).

Andy01 wrote:

Nice image.

In the astro forum most purist actually seem to favour a Daylight WB setting to avoid the blueness. It is a personal taste thing though.

Hi Colin,

Yeah, if NASA followed the Purists their artists and photographic retouch unit would have nothing to do. Most of the planet images we see (including those of the surface of Mars and the planets themselves, even the Milky Way) are "false color images". Sometimes they're entirely created and other times they show false color spectrum (including many of the recent Pluto images). The Milky Way has a very different look when we see it through different wavelengths.The human eye generally only sees a limited number of colors from distant objects like this.  I'm not too worried about what the folks on the astro forum think about this because I've seen them go off at people for shooting with Tungsten in the past - and I think that the effect can be flattering in many ways.

I am quite surprised by the roundness of most stars. I was expecting to see more elongation at 15 seconds on a 32mm lens on APS-C. In FF equivalent terms this would be Rule of (32 x 1.6 x 15) = 768. Most modern sensors tend to start generating star elongation (trailing) around 200-300. The old Rule of 500 is usually successful only on old film cameras or old low-res digital. I know that I start seeing it at anything over 20 seconds (and even at 20 seconds in places) on my 6D ii + 14mm f2.4, which is 280, so a long way from 768.

The lack of Coma was VERY surprising to me with this lens. The same applies with the EF 50mm f/1.2L USM lens as well but I really did expect to see noticeable Coma with the 32mm lens.  And the 50mmL lens has a lot more PF/CA visible (it's possibly corrected more on the 32mm).  It much stronger/worse with the EF 24mm f/1.4L USM II lens and Canon had managed to correct it somewhat with lens optics curvature and optical coatings that corrected both the falloff and reduced coma.  But it's still there.  Even Sigma couldn't eliminate it from their own similar lenses.
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The lack of obvious elongation (star-streaks) was great to see although this shot has just the tiniest amount because it use data from a 15 second shot.  They say that the rule of 600 applies to APS-C so that ought to offer about 18 seconds of exposure before streaking with a 32mm lens (I guess 20 seconds would apply).  I've usually applied the 500 rule which gives me 15.6 seconds with this lens.
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Like you, I've noticed that 20 seconds with the 22mm and 24mm lenses is the safe zone. I'd love to purchase an effective EQ tracking mount sometime soon but I might not use it enough to warrant buying one.