An appropriate facial expression for the stale (wilful?) misapprehensions in this thread.
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Canon EOS R7 Mark II Rumored Specifications Round-up
- Thread starter Canon Rumors
- Start date
If the R7Ii gets an R6 body with cooling it will most probably grow weight. The birding set up requires low weight. The Rf100-400 is pretty light, but apenditure comprise at the long end.
If the price really would be around 2300$, would an OM1 mark II with their oly 100-400 lens not a better value proposition? Micro 4/3 gives crop factor 2. Is the lower MP an issue? The sensor is smaller, hence probably not? Probably same weight range, however a bit more expensive?
If the price really would be around 2300$, would an OM1 mark II with their oly 100-400 lens not a better value proposition? Micro 4/3 gives crop factor 2. Is the lower MP an issue? The sensor is smaller, hence probably not? Probably same weight range, however a bit more expensive?
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Practically speaking, it will likely end up being a wash. The m4/3 sensor will have about 1/2 stop more image noise than the APS-C sensor (e.g., ISO 2200 on the OM-1 II would look like ISO 3200 on the R7II), and the OM lens is 2/3-stop faster. So about 1/6-stop overall advantage of the OM system despite the slower aperture of the Canon RF 100-400, and the RF 100-400 is about half the weight of the OM 100-400 II. The OM-1 II weighs the same as the R7 so if weight is your primary concern then the Canon will be the lighter system by at least 500 g and probably more.
400mm on 2x will give more reach, but the significantly higher MP count of the R7II (even if it stays at 32 MP) will allow deeper cropping for the same output. You'll get more 'pixels on duck' with the Canon setup.
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I can back up what Neuro said from personal experience with the R7 + RF 100-400 and that OM setup (shhhh, don't tell anyone 
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I made exactly this evaluation when getting started in bird photography. The OM1 is a nice camera, but the M43 size advantage is undermined by the 100-400 lens being the same weight as the RF100-500. The R7 + RF 100-400 was substantially lighter *and* cheaper than the Olympus kit when I was comparing them - the Canon combo was only slightly more than the OM1 body and almost $1500 less when adding the lens. Furthermore, for birds pixel density is a better metric than crop factor since you're rarely 'filling the frame'. The OM1 and the R7 have basically identical pixel density, so in terms of 'pixels per duck' at equivalent focal length they're a wash. (that changes if you consider video though - crop factor will apply to video as it's typically full-width of the sensor)
The OM1 MkII does have better AF than the existing R7 (mostly in consistency rather than absolute capability). I think it's a working assumption that an R7II in line with these rumors will fix the AF weaknesses of the R7 and elevate it close to the R5II which is at least on par with the OM1. Of course, the rumored R7II seems like a mismatch with the RF 100-400 and pairing with the RF 100-500 will now likely end up being $1000-1500 more than the OM setup so the value question flips the other direction.
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