Metabones Speed Booster, a self-killing flop?

In article ,
RichA wrote:

Apparently, this expensive ($400+ depending on converting what mount to what
mount) device, designed to speed-up a lens by 1 f-stop (and in the process
reducing the effective focal length by about 30%) causes the light rays to
slant so much entering the sensor, that some of the light never makes it into
the pixel, resulting in a net SLOWER aperture than the original lens has! In
other words, it negated its own claimed function!!! However, on long focal
length lenses this effect will be lessened because the light rays from the
principal lens are more perpendicular to the sensor. The Speed Booster is a
reverse-teleconverter really, that fits between the lens and the camera.
That the device doesn't kill lens resolution and adds only a small amount of
colour error is impressive, however. Unfortunately, the Holy Grail of
blinding sub-f/1.00 f-ratio speed is still in the hands of $1000 Voigtlanders
and $12,000 Leica lenses.

There are knock offs by the buckets on the bay. $100-ish. Nikkor to Fuji
are available... Again, YMMV.
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teleportation kills

In article , android
wrote:

In article ,
RichA wrote:

Apparently, this expensive ($400+ depending on converting what mount to
what
mount) device, designed to speed-up a lens by 1 f-stop (and in the process
reducing the effective focal length by about 30%) causes the light rays to
slant so much entering the sensor, that some of the light never makes it
into
the pixel, resulting in a net SLOWER aperture than the original lens has!
In
other words, it negated its own claimed function!!! However, on long focal
length lenses this effect will be lessened because the light rays from the
principal lens are more perpendicular to the sensor. The Speed Booster is
a
reverse-teleconverter really, that fits between the lens and the camera.
That the device doesn't kill lens resolution and adds only a small amount
of
colour error is impressive, however. Unfortunately, the Holy Grail of
blinding sub-f/1.00 f-ratio speed is still in the hands of $1000
Voigtlanders
and $12,000 Leica lenses.

There are knock offs by the buckets on the bay. $100-ish. Nikkor to Fuji
are available... Again, YMMV.

I found one! Now, if I just could find a wired EF to EF-M at the same
pricepoint... Then I just might...

http://tinyurl.com/p2jn7zw
--
teleportation kills

RichA Wrote in message:
On Wednesday, 3 June 2015 00:49:39 UTC-4, android wrote:
In article ,
RichA wrote:

Apparently, this expensive ($400+ depending on converting what mount to what
mount) device, designed to speed-up a lens by 1 f-stop (and in the process
reducing the effective focal length by about 30%) causes the light rays to
slant so much entering the sensor, that some of the light never makes it into
the pixel, resulting in a net SLOWER aperture than the original lens has! In
other words, it negated its own claimed function!!! However, on long focal
length lenses this effect will be lessened because the light rays from the
principal lens are more perpendicular to the sensor. The Speed Booster is a
reverse-teleconverter really, that fits between the lens and the camera.
That the device doesn't kill lens resolution and adds only a small amount of
colour error is impressive, however. Unfortunately, the Holy Grail of
blinding sub-f/1.00 f-ratio speed is still in the hands of $1000 Voigtlanders
and $12,000 Leica lenses.

There are knock offs by the buckets on the bay. $100-ish. Nikkor to Fuji
are available... Again, YMMV.
--
teleportation kills

I saw a test between some of the knock-offs and the Metabones. The Metabones slaughtered them for sharpness, colour correction so for what it's worth, it's the best out there right now. As a lens focal length reducer, it's ok.

If you mean the test that I've linked below then I think that
you're exagerating... And other combos might yield other results
and this test was made on one of those pitiful quarterframe
sensors.

http://www.dpreview.com/forums/post/53156458

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