So I finally made the jump from my old 7DII to the R6 Mark II and man the autofocus is insane but I feel like my glass is holding me back now. I’ve been using the EF 100-400mm L II with the control ring adapter for years and it was always my sharpest lens but on this new body everything looks a bit soft when I crop in heavy. I guess I’m used to the 1.6x crop reach and now that I’m full frame I’m pushing the files harder than before. Im mostly shooting songbirds and raptors out here in the PNW so light is usually pretty crap which doesnt help. I need something that can actually resolve the detail for those tiny feathers without looking like a mushy mess.
My constraints:
- Budget is around $4,500 max
- Must be hand-holdable for 3+ hours
- Native RF preferred to lose the adapter bulk
- Needs to handle a 1.4x extender without losing too much contrast
I was looking at the RF 100-500mm but I’m worried the f/7.1 on the long end is gonna be a nightmare in the timber. Is the 200-800mm actually sharp enough for professional prints or is it just for hobbyist reach? I’ve got a trip to the coast in three weeks and really want to have this sorted before I head out. Should I just bite the bullet on a used 400mm f4 DO II or is there a better RF native path I'm missing...
The Canon RF 100-500mm f/4.5-7.1 L IS USM is the most reliable choice for your R6 II. Its noticeably sharper than the old EF lens and works well with the Canon RF 1.4x Extender.
- L-series glass provides consistent sharpness for heavy crops.
- Light enough for 3+ hour hikes.
- Better weather sealing for PNW rain. The f/7.1 isnt a huge issue since the R6 II sensor manages noise well... just keep shutter speeds high.
Building on the earlier suggestion, its basically a fight between the super versatile Canon RF 100-500mm f/4.5-7.1 L IS USM and that wild reach of the 200-800. Honestly though, if youve got $4,500 to spend, you could almost snag a used Canon EF 400mm f/4 DO IS II USM and a Canon Mount Adapter EF-EOS R if you dont mind the extra inch of metal. That f/4 is just incredible for those dark, moody PNW mornings when everything else is struggling! But if youre dead set on native glass for the coast trip, the 100-500 is just so sharp its scary. I've seen guys pull insane detail out of those files even with a heavy crop. Just bump that ISO and dont be afraid of a little noise... the R6 II handles it like a champ! Youre gonna have such a blast out there, the autofocus on that body is seriously life-changing!
Regarding what #4 said about "I totally get that transition from the 7DII," I really think you might want to look at the Canon RF 600mm f/4 L IS USM if you can find one used, though it stretches the budget. If that is too much, honestly, be careful with the zooms if you are really after that fine feather detail at a distance. I would suggest keeping these things in mind:
- Primes are just leagues ahead for resolving fine feather texture compared to the zooms you're looking at.
- Even a slightly older used prime lens will give you way more contrast in those PNW timber settings.
- Make sure to check the weight balance if you go with a big prime, as it can be tiring for 3 hours. I really feel like you will regret the variable aperture zoom if you are used to the 100-400 L II quality. Just my two cents, but maybe save up a bit more for a prime and keep the adapter for now.
I've been thinking about your reach issue and I felt the exact same way moving from crop! I ended up trying the Canon RF 200-800mm f/6.3-9 IS USM and it is actually amazing. I love it! Its been super reliable even in our gray PNW weather. Since you're worried about f-stops, modern noise reduction is a total lifesaver. Its a fantastic way to get that reach back without breaking the bank!
I totally get that transition from the 7DII, the loss of that extra reach can be super frustrating. I went through the exact same thing a while back and spent way too much time obsessing over pixel peeping my raw files.
- When I switched over, I spent a lot of time testing out different glass configurations in the local woods.
- I found that my hit rate actually went up when I stopped worrying about the aperture numbers and started focusing on how the autofocus tracked in low light.
- For me, the weight was the biggest hurdle. Carrying around heavy gear for a full morning really wears you down, so I ended up choosing a setup that felt balanced on the body even if it meant sacrificing a little bit of light gathering. At the end of the day, my current setup isn't perfect for every single situation, but it keeps me out there shooting longer. Those heavy crops are always gonna be tough, but getting the composition right in-camera usually beats the best lens for saving a bad shot anyway. Good luck with your coastal trip, hope the weather treats you better than it usually does here!