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A reverse teleconverter which, Instead of increasing focal length and making a lens slower, it decreases focal length and makes a lens FASTER!

Product White-Paper:
http://www.metabones.com/images/metabon ... 0Paper.pdf


Product link:
http://www.metabones.com/product/speed-booster

Sounds rather interesting...then I saw the pricing....and the lack of a M43 variant at present.

I will have to a better read but I dont quite understand the "speed boost"....maybe later when I get home.

As the article states, this sort of thing is very common in astrophotography under the term "focal reducer". The article is wrong to state, however, that this couldn't be done with DLSRs. After all, DSLRs are often used with telescopes and focal reducers.

Cheers
Steffen.

Just re-read the white paper in regards to gaining aperture...the math makes sense...this is looking pretty interesting

aim54x wrote:Sounds rather interesting...then I saw the pricing....

I did not think the pricing too bad, when you compare it to that of 'normal' teleconvertors. It will be interesting to see some results from production versions of the product from real time photography.

Geoff M wrote:

aim54x wrote:Sounds rather interesting...then I saw the pricing....

I did not think the pricing too bad, when you compare it to that of 'normal' teleconvertors. It will be interesting to see some results from production versions of the product from real time photography.

It will definitely be interesting to see these in action. As for being cheaper than a 'normal' teleconverter you have to factor in who it is made by (a Kenko teleconverter is cheaper than this) and its role. I run my M43 and CX cameras as secondary cameras, I do not use them for anything important so I am adverse to dumping money into a converter that may (most likely will) leave me stranded without AF or metering, for that sort of money you can get yourself a nice piece of M43 glass, and almost a piece of Fuji X glass, and two of the Nikon 18.5mm f/1.8 lenses for CX)

Steffen wrote:As the article states, this sort of thing is very common in astrophotography under the term "focal reducer". The article is wrong to state, however, that this couldn't be done with DLSRs. After all, DSLRs are often used with telescopes and focal reducers.

You'd need medium format lenses, though, otherwise the image circle would not be large enough. Also, the first link says the mirror gets in the way. Maybe neither consideration applies to telescopes.