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Tom R5R7 replied to the thread A New Constant f/4 Aperture RF-S Zoom Coming.
Yeah, even on in the 10D says, 17 was tight. But the standard "kit" lens 18 was even tighter. And for all the concerns about...
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rombe3jr replied to the thread Canon Says it’s up to Sigma to Make Full-Frame RF Lenses.
Canon wants 30% of the sale price as a fee for anyone using the RF mount. Pay or get sued.
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InternalRevenue replied to the thread A New Constant f/4 Aperture RF-S Zoom Coming.
I somewhat feel the same but 17mm ends up just a little too tight often enough for my video projects that I still kept and use the 15-85...
Tom R5R7 replied to the thread A New Constant f/4 Aperture RF-S Zoom Coming.
I used the Canon 17-40 f/4L on my 10D and 30D cameras back in the day. At the time, it was about the sharpest ultra-wide Canon had, with...
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Aldherrian replied to the thread A New Constant f/4 Aperture RF-S Zoom Coming.
This supposed RF-s 15-70 F4 is a lens I would have gladly bought to upgrade from the EF-s 18-135 and update the EF-s 15-85.
Both are...
neuroanatomist replied to the thread A New Constant f/4 Aperture RF-S Zoom Coming.
It doesn’t scale like that, as @AlanF stated. For example, my RF 100-400mm f/8 has a front element of ~50 mm in diameter. 400 mm / 8 =...
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zapper replied to the thread Canon Says it’s up to Sigma to Make Full-Frame RF Lenses.
Thanks for the clarification - this helps a lot. I've noticed that the lens corrections appeared to be working despite what I thought...
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phree_ed replied to the thread A New Constant f/4 Aperture RF-S Zoom Coming.
How I would have liked a replacement to the 15-85 for my R7 but sorry Canon - too late. I got tired of waiting and just three days ago...
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zapper replied to the thread A New Constant f/4 Aperture RF-S Zoom Coming.
But no commercial lens is a simple lens. In a complex lens, the size of the rear and intermediate elements can scale with sensor size...
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mb66energy replied to the thread A New Constant f/4 Aperture RF-S Zoom Coming.
15-70 f/4 would be a great video lens for me - especially when it is equipped with motorized zoom (PZ). Could "replace" the cinema lens...
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zapper replied to the thread A New Constant f/4 Aperture RF-S Zoom Coming.
Right, if D = f/N, (D=entrance pupil, f=focal length, N=f number) and f and N both are scaled by the same crop factor for an equivalent...
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kreb's cyclist replied to the thread Will it Finally Happen? A New Macro Lens Longer Than 100mm With Variable Magnification.
If this turns out to be true, this would be an instant purchase for me. I've been using the old EF 180mm for years.
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nadroj replied to the thread Canon Says it’s up to Sigma to Make Full-Frame RF Lenses.
I did quite a bit of research on this when I bought the Sigma 17-40mm f/1.8 and while it's difficult to find solid answers, what I found...
Andreasb replied to the thread A New Constant f/4 Aperture RF-S Zoom Coming.
FINALLY!!! Why has it taken so long for Canon to realize that there is a real need for an all around 24mm equivalent zoom for apc-c...
AlanF replied to the thread A New Constant f/4 Aperture RF-S Zoom Coming.
The crucial point in these discussions is as follows. Above a certain focal length, 50-100mm or so, the natural image diameter of a...
neuroanatomist replied to the thread A New Constant f/4 Aperture RF-S Zoom Coming.
My point was not about equivalence nor to show that, but merely to show the reason that I would never set an APS-C camera to ISO 25,600...
neuroanatomist replied to the thread A New Constant f/4 Aperture RF-S Zoom Coming.
Indeed, there is a size/weight advantage when designing lenses for a smaller sensor for focal lengths in the ultrawide, wide, normal and...
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zapper replied to the thread A New Constant f/4 Aperture RF-S Zoom Coming.
These examples definitely show the advantage of a larger sensor, but they aren't taken under the conditions of equivalency, where the...
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zapper replied to the thread A New Constant f/4 Aperture RF-S Zoom Coming.
Another FF vs APS-C comparison, between lenses I own:
Nikon Z 24-70 f/4 S: ø: 77.5 x L: 88.5 mm; 500g
Sigma RF-S 18-50 f/2.8: ø: 69.2...
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AJ replied to the thread A New Constant f/4 Aperture RF-S Zoom Coming.
15-70/4 looks like a handy range. Nice to see RF-S support from Canon. Yes, f/4 is not sexy but selective focus is not the point of...
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zapper replied to the thread A New Constant f/4 Aperture RF-S Zoom Coming.
Very true. Equivalency only holds over the range where FF ISO = crop ISO * scale factor. Breaks down at both ends of the ISO scale - I...
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zapper replied to the thread A New Constant f/4 Aperture RF-S Zoom Coming.
Yes, APS-C needs the same exposure as FF. But to get an equivalent image (same exposure, FOV, DOF, motion blur, and image quality...
neuroanatomist replied to the thread A New Constant f/4 Aperture RF-S Zoom Coming.
Benefits of collecting more total light, and not just at base ISO. At lower ISOs, the DR advantage is what is most noticeable -...
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zapper replied to the thread A New Constant f/4 Aperture RF-S Zoom Coming.
That is partially correct.
- Yes, the apertures must be different, by the crop factor of 1.6 (the FF is bigger by 1.6). Notice that I...
neuroanatomist replied to the thread A New Constant f/4 Aperture RF-S Zoom Coming.
Much like the adage that you can lead a horse to water, but you can't make him drink, @Xpenelas shows us that you can lead a fool to...
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