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rscheffler wrote:
The Sigma 28-45 looks to be optically extremely impressive. But it's aimed at a different user willing to tolerate its size, weight and especially its limited zoom range for that amazing optical performance. As you suggested, one is almost always going to pair it with another lens, which is one more thing to carry, and more weight. I was very skeptical about Canon's 28-70/2 back in 2018 (no 24mm, size, weight, price), then I used one a few times and quickly changed my mind and accepted the cost of entry, given that it would effectively replace numerous prime equivalents. Maybe I'd feel similarly about the Sigma, but at the moment the zoom range topping out at 45mm is a major detraction, at least for me.
The Canon 28-70/2.8 is a more mainstream 'standard' zoom, that likely in order to fit within certain parameters (size, weight, range, price), is what it is. Sure, pick a certain specification and there will be better alternatives. But as a total package, it will have relevance within Canon's RF lens walled garden.
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within RF lens walled garden, sure
rscheffler wrote:
And it appears to address a major criticism: lack of fast and 'affordable' options (affordable of course being very subjective).
It addresses that critique, yes. I don't think the RF 29-68mm and the Sigma FE 28-70mm are thát incomparable you can't conclude the RF lens is significantly less affordable. The RF lens adds ILIS, and the RF lens is compatible with the R8 which is good value for money, however, at some point adding more lenses being relatively poor value for money "because you're locked up in the RF lens walled garden" you'll go beyond the tipping point where the FE system overall has the best value for money.
rscheffler wrote:
The number of Canon users at whom this lens is targeted also shooting with other mirrorless systems is probably single digit percentages. Therefore the majority won't have the option of the lens choices you stated above.
While true, it's another example new adopters should think twice before entering that RF lens walled garden, for instance by getting that R8. The price difference between the RF 29-68mm f/2.8 stm and the Sigma 28-70mm f/2.8 fills a large part of the gap between the price of the A7CII and the R8. Generally, when buying the second or third lens, the A7CII is turns out to be no only the better value for money option, but also the more affordable option.
Lets not forget you don't have to shoot Canon RF to shoot a compact 28-70mm f/2.8, as the FE system offers that option as well. A single platform can do the job, unless you have specific needs only the RF mount can fulfill for you.
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