Dusk with the 2x SLR Magic Anamorphot
Olympus 40-150mm f/2.8 Lens Review at Fotozones.
Ikelite housing for the GX7 (Ikelite)
Metabones Speedbooster + Sigma 150-600mm= 850 mm f/4 (CameraStuffReview).
FL-LM3 is compatible with GM5/LX100 (Dpreview forum).
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Dario Viola: “A 500mm f8 zeiss mirotar on the field, Contax CY mount the lens is a mirror tele photo, so very compact, no iris control so is fix on f8, complicate focusing, but it delivers an interesting image: https://vimeo.com/114368240”
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R.J. DeGuzman43rumors: “Got my E-M5mk2 in yesterday and the rear dial didn’t work! D’oh! Oly shooters be sure to check your dials. With all the free time I had, because I didn’t have a fully functioning camera to play around with, I made a quick video clip: https://www.youtube.com/watch?v=XBX2-h62jAM”
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4 Responses
“Speedbooster + Sigma 150-600mm = 850mm f/4” is doubly wrong. First, it’s either “425mm” or “850mm equiv.”, but never 850mm. Second, it’s f/4.5, not f/4, because one stop more than f/6.3, which is the original aperture of the lens, is f/4.5. So it’s a real 425mm f/4.5 lens and an 850mm equivalent lens with a real aperture of f/4.5 and an 850mm f/9 equivalent lens, but in no way this is or will ever be an 850mm f/4 lens.
That said, it’s an interesting approach to use a Speed Booster with a supertele lens, as long as you don’t need every mm focal length of it – which unfortunately is often the case, though, when shooting wildlife, especially birds.
After all, for whatever can be done with a 150-600mm plus SpeedBooster, the upcoming 300mm f/4 plus MC-14 (resulting in 420mm f/5.6) will very probably be the better choice, except that it doesn’t zoom and isn’t quite as fast. It will definitely be sharper and much smaller and lighter, though.
I’ve used the camera EXIF information for the aperture.
Metabones claims 1 stop, but both the Olympus OM-D E-M1 and the Panasonic GH4 register the combination as 426 mm f/4. And exposure is correct using f/4.
f/8 (f/9) equivalent is correct in terms of depth of field, but not for exposure or field of view.
For a correct exposure it really is f/4:
f/4 426 mm at micro-43 using the speed booster @ 100 ISO 1/1000 sec yields both in terms of field of view and exposure settings the same result as a 850mm f/4 full frame lens @ 100 ISO 1/1000 sec, but a different depth of field
Regards,
Ivo Freriks
When I say equivalence, I mean overall equivalence, like dpreview’s Richard Butler explained it in a rather good article some time ago. Hint: the same exposure at the same ISO is not equivalence, the same exposure at equivalent ISO settings is.
Regarding f/4, I still doubt your findings. The Speed Booster cannot provide more than one stop of aperture improvement, whatever it electrically reports to the camera, which may likely be a rounding error. I own a Speed Booster myself, although only a fully-manual one for Minolta SR/MC/MD – it’s should be the same glass, though. By the way, if it would offer a greater aperture improvement than one stop, it would have to reduce the focal length further, too, than just to 0.71x. You can’t have one without the other, and while Metabones would probably be glad to be able to make a stronger focal reducer for normal M43 cameras (not just for Blackmagic video cameras, like they already do), we can be pretty sure that any currently available adapter isn’t one.
Hi Hubertus,
I know Richard’s article and I really liked it, just like Tony Northrup’s video’s about this topic. You’re right about overall equivalence and perhaps I should have used 850mm equiv. in the title.
Both focal length and aperture seem to me not to be the easiest parameters to use in combination with overall equivalence. There’s a conflict between actual exposures settings, FOV and DOF.
If a photographer with a 400mm f/4 lens and a camera with a full frame sensor decides to crop his image 2x, he probably will not say that he shot the image at f/8 equivalence (would you?). And he will probably say he shot the image @ 400mm and not 800mm (equivalent).
On the other hand, I don’t even know one photographer using a compact camera (with crop factors like 6), who says he’s using a 25mm f/3 telelens, or (in overall equivalence) his 150mm wide open at f/18.
f/4 will be a rounding error. I agree with you.
It will be very interesting to compare the 425mm f/4.5 Metabooster + Sigma combination with the forthcoming 300mm f/4 plus MC-14 (resulting in 420mm f/5.6). In theory a teleconverter enlarges lens errors and a focal reduces (Metabones) decreases lens errors.
Both Sigma and Olympus make very good lenses. I don’t know on forehand which combination will win optically.
The Olympus has AF, where the metabones combination is only MF.