Technical question about Fuji X and Metabones speedbooster

Here is the English X-Pro1 manual http://www.fujifilm.com/support/digital_cameras/manuals/pdf/index/x/fujifilm_xpro1_manual_en.pdf

Here is the general link for all Fujifilm manuals http://www.fujifilm.com/support/digital_cameras/manuals/

(As for your original question, I'll leave that to someone who knows more than I)

You must find the menu item "Shoot without lens". There is no electronic connection between camera and lens so this is necessary. There is another menu item which allows you to enter the focal length in use but it has no effect on picture taking - only for your exif info.

Obviously you will shoot in either manual exposure or aperture priority (so put the shutter on A and select your aperture on the lens).

The evf/LCD will automatically brighten to counter the effect of closing the aperture unless you also find and select the item "Preview WB/exposure in manual mode" in which case you will have WYSIWYG.

You can still use auto ISO or fix it as you wish and also have recourse to plus/minus EV.

Obviously manual focus only but with magnified view and/or highlight peaking or split screen (not so good) depending on your setup preferences.

Vic

You'll need to use the correct focal length to get accurate frame lines when using the optical finder. Multiply the lens' focal length by 0.71 to get the lens + adapter focal length, which should be given to the camera.

Thanks so much for the detailed answer. I didn't actually know about the "Preview WB/exposure in manual mode" setting, that's gonna come in really really handy with my regular adapter

Okay, so the frame lines need to be corrected with the speed booster, that answers the other half of my question

Really appreciate the help

JonPB said:

You'll need to use the correct focal length to get accurate frame lines when using the optical finder. Multiply the lens' focal length by 0.71 to get the lens + adapter focal length, which should be given to the camera.

Click to expand...

Should the multiplier be "1.71" ???

Apologies.... You are right about the multiplier!!! I found an article with an explanation and formula ... https://www.lifewire.com/focal-length-multiplier-for-lenses-493735

Hi, I think the math is: 50mm SLR lens x 1,5 APC factor x 0,71 reducer factor = 53mm

and with the aperture is similar, hope that helps

raiz1 said:

Hi, I think the math is: ... 1,5 APC factor ...

Click to expand...

"Equivalence" and "crop factor" should only be used when comparing one format to another. Here, the sensor size stays the same, so that shouldn't be a consideration.

A 50mm lens is a 50mm lens, no matter what camera it is mounted on. When adding the optics of a Speed Booster (or any other focal reducer with the same optical power) behind it, the combined unit literally becomes a 35.5mm lens. There's nothing equivalent about it: the combined unit is a 35.5mm lens. Mount that lens unit in front of a 24x36mm sensor, and you'll see the same 35.5mm lens magnification, only with a smaller image circle than the unmodified 50mm lens.

If you want to compare a 50mm lens with a Speed Booster on a 16x24mm sensor to the same 50mm lens without a focal reducer on a 24x36mm sensor, then you're comparing one format to another and crop factor becomes a useful concept. That is because "crop factor" refers to the sensor size: the 16x24mm-to-24x36mm crop factor is 1.5 because the smaller sensor is essentially cropping out the inner portion of the larger sensor, and any linear dimension of the 24x36mm sensor divided by the same dimension of the 16x24mm sensor is 1.5, e.g. height (24mm/16mm=1.5) and width (36mm/24mm=1.5). In this case, a 50mm lens + Speed Booster = 35.5mm lens, which has the same field of view as a (35.5mm lens * 1.5 crop factor = ) 53.25mm lens on a 24x36mm sensor.

There are a lot of convenient shortcuts in photography that work great in the field but which can obscure what's actually happening when certain assumptions are broken, like when changing sensor sizes or using a focal reducer. I hope talking about what they're derived from has helped make these ideas a bit clearer.

Given the high price of these things ($650.00 range), I'd be interested to know about the image quality you get with and without the speedbooster, and whether or not you think the image quality is affected in a negative way by the speedbooster optics.

--
Tom Schum
Every day a new paradigm.

Honestly, I lack the competence to judge such a thing but I have read multiple reviews and the general consensus seems to be the following:

Among the focal reducers Metabones seems to be the best, closely followed by the lens turbo II. The problem is that lens turbo doesn't have a Minolta MD to Fuji X option and I have no clue if stacking adapters is a thing (probably the wrong forum for that).

At 1/4 the price, I would probably have grabbed a Lens Turbo II long ago, if that one existed for MD to Fuji X.

I found a really nice comparison here: http://fujixtras.blogspot.dk/2013/09/metabones-nikon-f-to-fuji-x-adapters_2749.html

Also phillipreeve.net/ seems to be a great source for everything about adapted lenses.