Frogfish
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newdom wrote:
Awesome, I'll tell my photos from this lens and hopefully the fringing will disappear overnight. Shall we also tell the multiple professional reviewers that found CA with this lens that they should fix their reviews?
Dustin Abbott mentions coma is well controlled in the center for astro (less so in the corners), and tests other forms of CA on closeup charts only. He also gets his lenses sent from Samyang and they are clearly carefully selected as I haven't seen a review from him with any of the normal issues. Either that or he has lottery level luck. A single review and your own experience doesn't 'prove' anything, nor are you in a position to make a general sweeping call on the lens as a whole for the rest of us.
It's a superb lens, otherwise. Incredibly sharp and lovely colour/contrast/rendering. Awesome value for money.
I can't remember where I saw the first lot - they were in some yellow light bokeh on an early video and they stood out. You can see some in this video:
Generally though apart from a bit of fringing the bokeh looks really nice in this lens and we're getting lots more videos finally on youtube to look at. Samyang themselves say they are using polishing on the aspherical elements rather than the more reliable method of precision moulding that Sony are using for their GMs, so there will be more variation. There is for sure some CA and probably field curvature, but it's a cheaper lens and different lens manufacturers choose how much optical correction to deploy vs character and cost. Samyang do a great job and these cheaper lenses are a fantastic option for those of us that can't afford Sony GMs.
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I realise you are trying to find ways to defend your assertion but seriously ? You are going with DA was sent a plum lens by Samyang (and you claim not just for the 24 but all his SY lenses) that miraculously cured CA? And no he didn't say it was well controlled in the centre but less so at the edges. Note nobody said it's totally CA clear, just extremely low.
Here's the definitive review again, try re-watching it and let's see if you come back with the same quotation. You are currently at conspiracy level Defcon 1.
OK covering the Onion Rings first since this is an easy cover ... the only sign is a crop of edge bokeh at high res. Otherwise literally no-one, including Immortality in his review here, has claimed or complained of Onion Rings. The only person I've ever seen call it 'pronounced' is you.
It should come as no surprise, well it doesn't to most of us, that a lens pitched for Astro should be well controlled in not only CA but coma & edge distortion. What was most interesting was the comparison with the Sony 20mm (behind the SY24) and the Sony 24 (the best of the three). Also do note that, as far as I'm aware, unlike Sony lenses there is no in-camera corrections made. You either have to find a profile for your software or make them manually.
Compare that to your assertion on the SY24 : "Seems like Samyang's weakness is correcting CA. Their 24/1.8, while otherwise a great lens, still suffers quite a lot ... " You are miles off base with that statement.
And multiple professional reviewers claim CA is an issue ? Again to reiterate : note that nobody said it's totally CA clear, just extremely low. What was notable was that not one reviewer below claimed CA was an issue in their Cons column, not one. Here are professional reviews when used on a FF camera (not APSC) :
Christopher Frost : "a very small amount of PF in the corners, but very small. At f2.8 nothing". Later in the review he said the same, "a little PF at f1.8 gone by f2.8. Coma - even at f1.8 barely a trace of coma smearing. Much less than you would expect to see from a lens of this type".
Dustin Abbott : "very little evidence of Long. Abb, and no evidence of Lat. Abb. Long abb (f1.8 on an A1) almost no Magenta but a little more Green fringing but not pronounced. "
Digital Camera World : Color fringing and barrel distortion are very minimal, even when uncorrected.
SonyAplha : Chromatic aberrations are low but present. Coma performance is quite good with very little smearing in the corners at F1.8 which is very good for astrophotography. You gain a little bit by closing at f2.8 (they show photos of coma crops into the corners).
Shotkit : "Chromatic aberration seemed to be non-existent" (personally I can't agree with their assessment but it is very very low).
Ephotozine : Summary - There are some signs of CA and some barrel distortion, not too excessive and correctable anyway in camera or in software.
Lenstip : Noticed Longitudinal at f1.8 (from their charts it's mainly when the lens is used on APSC) but also stated " It is not a level you can call bothersome so also in this case our assessment remains positive."
But also said re. Latitudinal " On the edge of full frame this aberration increases on stopping down the aperture from f/1.8 to f/5.6, ranging from practically zero to 0.03%. As any result below 0.04% we qualify as a very low level, here we have no reasons to complain."
On Coma : When it comes to coma correction we don't have any major reservations. In the corner of full frame, even at the maximum relative aperture, images of a diode are deformed in a moderate way, a medium level nothing more.
Not all were convinced with Goldstein at PhotographyBlog saying there was 'clear evidence' and calling them 'prevalent'. Though note prevalent doesn't mean strong. Also note there he's talking & showing crops not the full scene. From his full scene pics PF can be seen on close examination of his A7r4 shots at full resolution. But again it's not unless you deep dive into those high res images.
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