Questions tagged [focal-reducer]

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2answers
148 views

Is there a speed booster which will let me use an FX lens on a DX camera with wider focal length and aperture?

Since we have teleconverters that increase the BFD (back focal distance) of a lens and magnify the image, would it be possible to design a teleconverter that decreases the magnification and therefore ...
0
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4answers
830 views

How to calculate focal reducer crop factor for APS-C to MFT?

As far as I can tell, the crop factor determines the size of the projected image circle and should match the ratio of sensor diameters (with standard mount forward / backward distance). My ...
0
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3answers
209 views

Can I use an FD-EF adapter with an EF-EOS-M speedbooster?

I have an EF-EOS-M speedbooster for my M50. I just got a great deal on a FD 135mm 2.5 lens, and was wondering if I can put it together with an FD-EF adapter and the speedbooster. There doesn't seem to ...
2
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2answers
6k views

Can I use a Speedbooster with a Canon EF-S DSLR?

Could you please give me some advice about a speed booster? I have a Canon EOS 750D. Lately I have been taking quite a few night event photos. I do not have a fast lens (and can't afford one) and my ...
0
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2answers
559 views

Can a focal reducer be used with a teleconverter?

Can you use a focal reducer with a teleconverter? I don't believe it would be possible to do it but, is it? If I were to use a full-frame 50mm lens on a 2x teleconverter with a 0.71x focal reducer ...
0
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2answers
4k views

On a Micro 4/3s camera with a Speedbooster adapter, does a 50mm lens still effectively become a 100mm lens? [duplicate]

I'm admittedly rather new to the world of interchangeable lenses, and have just purchased a Panasonic GH4 and adapted it to a full frame lens with a Metabones speed-booster. I've been using a 50mm ...
4
votes
3answers
2k views

Using a focal reducer to match a lens to a crop sensor camera

Context So I've recently watched a video about how Tony Nortrup is referencing that you should buy the lens that perfectly fits your image circle, to get the most sharpness out of it, or so I'm ...
3
votes
1answer
1k views

Do focal length changing lens adapters affect the F-stop of a lens?

My question concerns things like the ultra wide angle adapter for the Sony Alpha/Nex/e-mount line 16mm f/2.8 prime pancake lens, which changes the focal length of said lens from 16mm to 12mm. Since ...
0
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1answer
162 views

How do focal distance reductors affect image quality?

I have a bunch of lovely old full frame K mount lenses (like the 50mm f1.2 and the 135mm f2.5) and the idea of using them in a proper mirrorless body (I have the K-01 and that's a hell of a brick) ...
4
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2answers
954 views

Is there something that is the opposite of a teleconverter?

I shoot a Nikon D80 that has a 1.5 crop factor. I'd like to find something like a .67x teleconverter so any full format lens I attach would then have their original focal length and would in theory be ...
14
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2answers
2k views

How can a speedbooster improve the light performance of a lens?

I have been reading couple of times now about those new speedboosters for mirrorless cameras. They are being reviewed as improving the low-light performance of a lens by one full stop. In my ...