hennie wrote in post #17229721
Amount of blur can be calculated using optical laws.
How to objectively determine quality / pleasingness of background blur?
I'll do my best to explain. To keep it simple, we'll just focus on 85 and 135 since I have readily available samples.
The 85L blurs more than the 135L with the same subject framing, however, being much wider, it also draws in more of the background, making items in the background smaller, and thus more recognizable.
I tried to frame these images similarly, and the 135 is more focused on the subject with a larger background. As the distant background is drawn closer and closer, it starts becoming a large muslin backdrop effect.
the 135 FOV cuts off all of the pavers on the left side, and less flowers are shown. The longer the lens, the better the isolation effect you can create. Essentially with a wider lens, you can get more blur if it's really wide aperture, but since it's wide, you cant really isolate as well which is relevant in the background blur debate since it has the ability to declutter based on FOV.
Simplest solution is to own them all
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Sony A7riii/A9 - FE 12-24/4 - FE 24-240 - CV 21/3.5 - FE 35/2.8 - SY 35/1.4 AF - FE 50/1.8 - FE 85/1.8 - EF 135/1.8 Art - F 600/5.6 - CZ 100-300 - Astro Rok 14/2.8 - Tamron 28-75/2.8 RXD, 70-200/2.8 VC