1bwana1
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 Re: Nikon Z 135mm f/1.8 S Plena Image Thread | |
Vento wrote:
1bwana1 wrote:
Vento wrote:
Where, of all things, the real special feature of the Plena and the major differences to the Sigma you'll find in the amount of optical vignetting.
This may not bother everyone, but should still be neutrally weighted and addressed in a review of a lens like the Plena, whose main criterion is precisely the unique selling point in the area of optical vignetting and light fall off.
It could be because of all the compromises a lens must make, optical vignetting is the most easily addressed in post. Also to be considered is that vignetting is often added in post rather than diminished. So, the value of the small differences in vignetting between these two lenses is small in practice. I think few would pay the price premium for this. The other benefits of the Plena may provide more value to most.
The "Light Falloff" yes, but not the effect of the optical vignetting, which leads to the truncation of light circles towards the borders of the frame, aka cat's eyes bokeh.
That's where the Plena's unique selling point lies, the rendering of out-of-focus point-light sources with an unrivaled low amoiunt of optical vignetting.and it was also the inspiration for its name.
I'm far from a pro at PP, so maybe I'm missing something, but it would be news to me that there are easy ways to reverse the negative effects of optical vignetting, resulting in a clearly visible cat's eyes bokeh, swirly bokeh's in PP so easily.
The Plena is very good with correcting those things. But it's bokeh balls also become more "lemon" shaped out near the edges as Ricci pointed out in his presentation.
This plus the Sigma 9 blades VS Plena's 11 blades makes a difference. The expanded image circle does as well. Also the modern ASP Grinding and polishing to reduce texture and onion rings in the Plena makes a difference. Of course this is also not unique to the Plena. There are other lenses out there that have those nice smooth rounded Bokeh balls out to the edges.
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