From 6D to RP? (R?)

christ0f wrote:

Hello,

Now the RP is in a very good price so I was considering a change of my still good, old 6D. The main reasons are: it's lighter, better AF and video that I do occasionally and focus stacking - doing lot of macro with my 100 2.8 (non-L)

The Focus stacking works well with a tripod.  I've had both good and bad results stacking images from the R-cameras.  But other members here have done well with it.  From memory, the EOS RP offers Focus Stacking but not the EOS R.  The feature is also on the R6.

I have some doubts:

- the viewfinder, I'm simply used to that from dslr, I have seen few of mirrorless, and thought Fuji X-T3 has a one that is ok, but I guess RP is not in the same league

The viewfinder on the RP is electronic and it's actually quite useful and I believe you get 100% scene coverage with it. The EOS R viewfinder is easy and enjoyable to use.  The EOS R6 viewfinder seems similar to using an Optical Viewfinder to me.  I sometimes forget until I notice all the icons floating about when looking through it.

- dynamic range - what I already read, I'm not gaining here, which is a pity after those years

Digital Cameras have been taking wonderful pictures for over two decades.  Early models in the late 90s and early 2000s had poor DR.  At first, people complained about the megapixels and then it was the Dynamic Range.  Modern digital mirrorless cameras are capable of excellent Dynamic Range.  We've reached and surpassed what has been before.  And every single year, folks keep expecting DR to increase.  And if there's a minor improvement they cheer and if there's no increase they lament.

- high iso noise - I'm often doing some fire-camp sessions, using ISO 6400

The R cameras are quite decent with noise.  The most recent models (R5/R6) offer a slight improvement over prior models but that's to be expected.

- generally ergonomics: I'm not sure how I also survive without the top screen..

You'll love it.  And that top-screen can be rather fragile if you're rough with your gear.  I certainly don't miss it on the R6 or on my wife's RP.

- battery life

Battery life is good.   It takes a dip with the new R5 & R6 which use more power and come with a new battery type that is kind of backwards compatible.  I think you'll find that the CIPA ratings for battery life are very modest on the R cameras.

I'd get the set probably with native 24-105 L and 35 1.8 (to replace my Sigma 35 1.4, making set really light). Still keeping 16-35/4 via adapter.

Those would be my first two choices for lenses for any new R-camera user.  These two lenses are excellent value and offer VERY good performance.

Many of the ticks here would be probably solved by R (not RP), but that is more expensive and I don't know why... has not the focus stacking on board. R5/R6 looks ideal on paper, but R6 is 2.5x more expensive that RP and 1.5 than R.

Advantages of the R would include sensor resolution, DR and the protective shutter curtain to prevent the sensor from being exposed during lens changes.  I feel that the R is more robustly built than the RP and that the R6 is tougher again.  The trick here will be the choose the right camera for you at this time.
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The R6 is an excellent camera but I personally feel that it's overpriced.  That said, it's still worth the money if your budget allows it.

From your experience, I guess many of you have switched from 6D or 5D II/III to those - do you have some comments?

I've come from the 6D and 5D III and bought an RP for my wife, then an Ra for myself for Astrophotography - followed by an R6 so that I could use the RF lenses myself.  I was ready to buy an RP for my own use if the newest announcements were not ambitious enough.  Though the R6 met my expectations, I still find the price to be a steep in this day an age. 
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If or when you buy an EOS RP, you'll find it is very similar to the results from your EOS 6D.  Oddly enough, I can say the same about the R6.  But with the R6, it feels like you're handling the old 6D.  The EOS R feels like a more advanced camera (design wise) than the RP when holding it.  But the RP is at a good price now and it does offer an excellent entry point for anyone wanting to enter the Full Frame mirrorless range.  I'd probably suggest the Grip-Extender for the RP because (1) it just looks good and (2) because it's an affordable accessory that will increase your grip on the camera whilst still allowing access to the battery etc.
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If you find an EOS R at a good price (which it ought to be selling at these days), it's going to offer you slightly more with performance and features.  It also looks quite nice. The optional battery grip is overpriced and unnecessary but it's available.
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I feel that all future R cameras from Canon will become more expensive.  That's partially the consequence of the impact of smartphones on camera sales.  If you buy an RP, any RF lenses (and EF lenses) can be used on future R models if you decide to buy a different camera in future.  The pictures from your RP will be similar to those from your EOS 6D but the really big difference is that you get to use Live View in a way that was impossible on the 6D.  I can remember trying to focus on a subject with the 6D and I had to use Manual Focus if I used an Extender.  That's no longer an issue with the R cameras.  And with the EOS R (not the RP), the larger sensor resolution means you'll get a little less noise or grain in your images.  Canon has suggested that this is due to the noise being averaged out over a larger number of pixels.  There's a LOT of customization available on any of the R cameras and you may never need or use all the features.  But if your EOS 6D is aging and you need something to offer Full Frame in Mirrorless, then it's worth the jump.