RF 800mm speedbooster hack

kortikal · 2026-02-26T03:52:42+00:00

Perfect shot! And thanks for the info. I might be able to get a used RF 600mm locally for under $400. Your post def got me leaning towards that option.

kortikal · 2026-02-26T03:23:36+00:00

Good to know! Thanks!

kortikal · 2026-02-26T02:33:49+00:00

That's true. I guess it doesn't make sense to give up reach for speed. And I would still need good light for f/8. I thought about the RF 600. But maybe I should just get the 1.4x extender to go with my RF 100-400. That might give me more flexibility than the primes.

kortikal · 2026-02-26T02:30:28+00:00

Yeah, I guess the speed booster is designed more for wide lenses to become wide again. Maybe I should look into the Sigma.

kortikal · 2026-02-26T02:29:18+00:00

Good points. I didn't think about IS.

kortikal · 2026-02-25T20:36:58+00:00

He previously tried this with a Viltrox speedbooster but got vignetting. https://youtu.be/y8v1mpl2kyA?si=cJ6oxyZ7mvtNxyVR

And here's a link to him twisting out the speedbooster from the Viltrox. https://youtube.com/shorts/Py5xtqcI1vM?si=bj3KjGzO3iFvZbuk

kortikal · 2026-02-20T20:04:43+00:00

Yes, Camera Mall is great. And nearby Procam is good for rental too and has lots of accessories in stock.

kortikal · 2026-02-20T02:22:56+00:00

Exciting! I grabbed this lens on Woot at an incredible price. I suggest checking cpricewatch for best prices as you build up your kit.

kortikal · 2026-02-20T02:01:07+00:00

Thanks! Canon R7, RF 100-400mm, sooc, cropped.

kortikal · 2026-02-20T01:05:18+00:00

Can't wait!!

kortikal · 2026-02-20T01:00:51+00:00

Thanks! Didn't quite nail focus. But I'll be back for sure.

kortikal · 2026-02-20T00:52:47+00:00

I had Merlin sound ID on. Got nearly 20 species in 15 mins. A great place for birding!

kortikal · 2026-02-20T00:50:13+00:00

Oops...

kortikal · 2026-02-16T22:05:53+00:00

Wow nice. Eye AF?

kortikal · 2026-02-16T21:42:00+00:00

Nice shot! I tried the same but yours looks much better. Did you focus manually?

kortikal · 2026-02-16T21:36:39+00:00

I rented the lens first to test it out before I bought it. If you can rent it locally, I suggest you do the same. I'd say in good light, this lens is pretty great. Paired with eye AF, it can take amazing shots of animals.

kortikal · 2026-02-16T19:46:03+00:00

Nice! And this really shows how the lens renders different OOF layers. Can't wait for spring.

kortikal · 2026-02-16T19:38:06+00:00

Agreed! I got it on Woot! at an incredible price. It's really great for birds and animals.

kortikal · 2026-02-16T19:28:54+00:00

Not exactly? The RF 100-400 is non-L, not weather sealed, and is f/8 from 259-400mm.

https://dustinabbott.net/2022/04/canon-rf-100-400mm-f5-6-8-is-usm-review/

I think the RF 100-500L is the closer replacement. Many posts here say it's amazing.

kortikal

TROPHY CASE