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News Panasonic 100-500mm f5-7.1 announcement

Quentinquirelino said:
Yes, it's basically the same.

Initial exposure, yes. But light captured, not. If you crop, you are literally cutting light away. If you would do the process analog, you would actually see it getting darker, when magnifying the picture, if you don't adjust for it. In digital, your computer, camera or whatever, does the adjustment for you in the background.
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It would be good to get to some agreement on this (and I accept I may be wrong)...

- Cropping keeps the same image brightness so the exposure remains the same. But you crop away 50% of the pixels (APSC) so the "total light" is halved. This matters if you upscale to the original dimensions because you'll introduce noise.

- Using a TC reduces the image brightness so you need to up the ISO to keep the SS and f-stop the same. This also introduces noise.

I think in principle the end result for a given image size is probably the same in terms of noise, but of course there is also the option to increase the exposure using a TC rather than up the ISO which will get back what you lose in "total light" terms. You don't have this option with cropping of course.

But of course, all this discussion is paying no attention to fancy NR techniques which will potentially level the field.
 
GeorgeHudetz said:
Another review:

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I love Hugh Brownstone’s videos. One, his voice is great, even if, most of the time, he rambles off on deeply nested sub points, some of which are only tangential to the subject at hand, or even sometimes concerning quite a different subject, but that’s ok, because… two, he knows what he’s talking about, probably gained from years of experience in taking photos, sometimes in mono, which, if I’m honest, I think are really very good, even if… three, he mixes real world shots with test subjects that I think give a good feel for a lens, even if, four point five, they are not rigorous optical evaluations. But, five, he has a certain style; I even like his B&W video treatment. And finally, six, errr, where was I?
 
GeorgeHudetz said:
They work optically, but they don’t report the extended focal length when used with Panasonic lenses. Not ideal for stabilization. I don’t recall if the correct f-stop is reported or not.
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Huh. Didn’t they all change that? I seem to recall that most Panasonic lens FW updates last year had “compatible with Sigma TC” on it.
 
pdk42 said:
I love Hugh Brownstone’s videos. One, his voice is great, even if, most of the time, he rambles off on deeply nested sub points, some of which are only tangential to the subject at hand, or even sometimes concerning quite a different subject, but that’s ok, because… two, he knows what he’s talking about, probably gained from years of experience in taking photos, sometimes in mono, which, if I’m honest, I think are really very good, even if… three, he mixes real world shots with test subjects that I think give a good feel for a lens, even if, four point five, they are not rigorous optical evaluations. But, five, he has a certain style; I even like his B&W video treatment. And finally, six, errr, where was I?
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:D LOL!

A great example of why I find his videos so frustrating! I've tried watching them at 1.5x and 2.0x but it doesn't help.
 
The Rigger said:
That's a pretty low bar. My Jeep is lighter than the Sigma 500/5.6.
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Because a jeep is a toy, no car…
To be honest: the Sigma 500/5.6 is very lightweight, maybe one of the most lightweight 500mm on the market. In comparison most of the other long lenses from CaNiSo and TaSiLao these have more lightweight constructions, or totally different aperture…
 
Quite expensive if you compare it to Sigma 150-600, at least here in Finland. 2189€ vs. 1479€. It is almost 1€ for each saved gram in weight.
 
actually if nice I might sell the 70-300 and go for this one. I only bring the 70-300 if I know I'm going to use the 300 (a lot).
 
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