About 11-25mm f2.0.
Very similar with "going crop" from ff.
Focal length x 1.4, aperture +1 stop
Speed booster can't change the aperture. It changes the focal length by 0.71 times. The f-number is reduced by the same factor because it is focal length/aperture.
There's the same amount of light passing through, it's just concentrated into half the area. Putting another lens on the back of your lens can't create light out of nothing.
thanks for correcting me on that. I appreciate the correction.
So id imagine this is a GOOD THING then to be able to get even wider!
Wider than what
There are already a few wide zooms for m43 that start wider than that combo { though not at F/2.0} Olympus 7-14mm F/2.8 , Olympus 9-18mm F/4-5.6 , Panasonic 7-14mm F/4 and 8-18mm F/2.8-4 . Unless you already have the Canon lying about I would go with a native optionThe Canon lens is large for m43 then throw in an adapter. How often would you shoot a landscape at F/2 ? For low light tight spaces or starscapes and so on I can see an appeal but not so much for typical landscapes .
a FF lens, a APSC lens and a m43 lens and place a piece of paper behind them while shining a light from the front. You will see the image circle illuminated on the paper. This is the area that the lens casts an image over. FF will be the largest and m43 the smallest with APSC in between.
I can imagine some shots where a wide F2 would be nice - in any case you always stop down.
With a .64x crop factor vs. .71x, the lens will also be brighter also by the same factor - a 10.24mm f/1.8 lens at widest.
Just beware that the .64x version is not compatible with some cameras (can damage the shutter I think).
Rhonda, It IS a good thing, but don't expect it to be as wide as the 16-35 is on a 35mm body. It will 'see' the equivalent of around 22-23mm on a 35mm body when mounted on your G9. About 1.4x, rather than the 2X you would normally expect on MFT.
You are being a bit obtuse their Bob, granted that it concentrates the same light exactly as you say but this is always usually expressed as an extra stop worth of light.
Another way of looking at it is to fit your focal reduction adapter to you camera body and look through it at your sensor - ye-gads it has grown and looks just like an aps-c one ....
This white paper might have been produced by the original designers of the Metabones Speedbooster but it still is a relatively unbiased report on the science of focal reduction adapters and what they can do.
Well, by now I'm sure you have seen a bunch of responses that run the typical spectrum of online forum responses. But with less vitriol and direct attacks than you'd get on any political forum.
