What is the best budget telephoto lens for the Canon EOS R10?

Question

Honestly so fed up with this 18-45mm kit lens that came with my R10. I bought this camera thinking I could finally get some decent shots of the bald eagles near the lake here in Seattle but man everything just looks like a tiny grey smudge. I tried cropping in but the quality just falls apart and its super frustrating because I am missing all these great moments while I am trying to squint at my screen. I really thought the kit would be enough to get me started but its basically a glorified paperweight for anything further than ten feet away.

Ive been looking at the official Canon site and some of those RF lenses are more expensive than the camera itself which is just... no. I cant justify spending two grand on a hobby right now. My wife would actually kill me lol. I need something that works well with the crop sensor on the R10 but doesnt feel like I am carrying a literal log around. The R10 is so nice and small it feels weird to put a massive lens on it anyway but I guess I dont have much choice if I want the reach.

Here is what I am looking for:

Budget: Absolute max $750 but would love to stay around $500 or $600 if possible.

Reach: Needs to be at least 300mm or more because these birds dont let you get close.

Weight: Not too heavy since I like to hike trails and dont want a neck ache.

Stabilization: Since the R10 doesnt have in-body stabilization the lens has to have it or my shaky hands will ruin everything.

I keep seeing people talk about the RF 100-400mm and then some other people saying to adapt old EF glass with a mount. I am just confused if the old lenses are gonna be slow or if the image quality is gonna be trash compared to the native ones. Is that RF 100-400 actually good in anything other than direct sunlight since the aperture is so small? I dont want to waste more money on something that frustrates me as much as this kit lens does. What should I actually buy?

RainyRaccoon · Accepted Answer

Honestly, just grab the Canon RF 100-400mm f/5.6-8 IS USM. I went through the same dilemma when I started shooting local wildlife. I tried the whole adapt old EF glass thing with a used Canon EF 70-300mm f/4-5.6 IS II USM and it just felt bulky. The adapter adds extra length and weight that kinda ruins the balance of a small body like the R10. I was skeptical about the f/8 aperture at 400mm too. But honestly, modern sensors handle higher ISO so well that it barely matters in daylight. I spent a weekend tracking ospreys and the autofocus on the native RF lens was way stickier than my adapted lenses. Plus, on your R10, that 400mm reach effectively acts like 640mm. It makes a massive difference for eagles. TL;DR: The Canon RF 100-400mm f/5.6-8 IS USM is the move. Its light enough for long hikes and the image stabilization is rock solid for shaky hands.

Ava Nicole Foster · Answer

Just found this thread today. If you are looking for a reliable setup that wont break the bank, looking at older EF glass is a decent option. You just have to be okay with the extra weight and size. Like someone mentioned, the native RF glass is light, but third-party lenses often offer more reach for the money.

Sigma 100-400mm f/5-6.3 DG OS HSM Contemporary for Canon EF. This lens is very sharp and fits your budget perfectly if you buy used. Youll definitely need the Canon Mount Adapter EF-EOS R to use it, but the autofocus remains fast and reliable on the R10.

Sigma 150-600mm f/5-6.3 DG OS HSM Contemporary for Canon EF. If you want the best possible shots of those eagles, the extra 200mm makes a massive difference. Its basically a log to carry on long hikes, but the stabilization is very effective for shaky hands. Either choice is a safer bet than staying with that kit lens.

Karesdog · Answer

> Is that RF 100-400 actually good in anything other than direct sunlight since the aperture is so small? I totally get the anxiety about that f/8 aperture, but honestly, modern sensors like the one in your R10 handle high ISO way better than people realize! I spent a week tracking red-tailed hawks with the Canon RF 100-400mm f/5.6-8 IS USM and the results were fantastic even under heavy clouds. Because the R10 has that 1.6x crop, you are actually getting a 160-640mm full-frame equivalent field of view which is insane for a lens that weighs basically nothing... Technically, the Nano USM motor in there is a beast and it focuses instantly. If you are worried about noise, just run your shots through Adobe Lightroom Classic using their AI Denoise or DxO PureRAW 4. It is a total game changer! It usually goes for about $650, so it fits your budget perfectly. You dont need to lug around a giant white lens to get crisp eagle shots. This lens is the perfect match for the R10 speed. You wont regret it, trust me!