FS7: Washed out image from FS7 & Metabones

B

Berk

Well-known member
Hello everyone
I have searched the forum but I couldnt find an answer regarding phenomena we are experiencing with our FS7 - metabones speedbooster combo.

Little bit of background about our workflow;
We shoot at 4K in RAW and use Canon L series lenses (24-70mm, 70-200mm, all version 2)

When there is strong head-on light towards to camera (either as reflection from the surface, or overexposed white background) the image gets washed out, looses the contrast and all its sharpness.

Has anybody experienced it? or Metabones has released a new version w better coating that i am not aware of?

Ps: I could provide samples
 
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I'm surprised buy how many people use speedboosters instead of the Mark4 as the standard adapter when using Canon glass on the FS7. It adds glass, so don't use it unless needed for the shot. I sometimes rent out my camera and all anyone asks for is a speed booster while I always carry both. Can't say I've had any bad experiences though.

I think the speedster Ultra introduced black flocking on the interior which should help. I'm not sure about that hough. Does anyone know if the Ultra was an optical improvement?

Looks like they just introduced a whole new lineo f adapters with positive locking mechanisms and other improvements.
 
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I don't know if there is a cure. I read somewhere that its a side effect of the focal reduction some lenses are better some worse the biggest offender is the 24-105.
 
I have only noticed a bit of the "washed out" image with my Speedbooster Ultra one time and it was with my Canon 2.8 24-70 ll while using a teleprompter, more glass! I don't use the SB anymore with a prompter and watch out for flares.
 
The "washed out" phenomenon you are observing is a lens flare; specifically it is referred to as a "veiling flare". It is almost certainly showing up because the speedbooster doesn't have the quality coatings that expensive lenses have.

I know that primes have significantly lower incidence of ghosting flare than zooms do, but I don't know if that applies to veiling flare as well. If you have a prime, it might be worth a test. Also, typically wide angle lenses will flare less than telephoto lenses because the light source will appear smaller.
 
Metabones Smart Adapters, & SpeedBoosters, with a "T" in their designation have an internal coating intended to minimizes reflections within the adapter barrel. If I remember correctly the "T" stands for "Transmission".

A SpeedBooster Ultra has five glass elements in four groups so increases any lens tendency to flare.
 
Berk said:
When there is strong head-on light towards to camera (either as reflection from the surface, or overexposed white background) the image gets washed out, looses the contrast and all its sharpness.
Click to expand...

Are there any UV or protective filters on your lenses? Even high quality ones have a tendency to introduce light falloff that reduces contrast especially in strong backlit situations.
 
I've noticed milky-white internal flares using a number of different adapters with the FS7. It is the cameras least appealing feature. Certain focal lengths seem to be worse than others, and it doesn't matter if it's awn a Speed booster or not.

BTW Lenny, It was the commilite adapters that needed flocking, not the metabones.
 
Is the rear element of the Speedbooster flat or near flat? If so then that's the answer. It acts as a mirror and reflects the sensor / sensor seal glass which are also quite reflective despite also being coated (the seal glass). Almost all of my older macro lenses (Kiron 100mm f/2.8, Tamron 90mm f/2.5) have this exact issue, that's because their rear elements are flat or near flat. If big areas of the frame are bright, the lenses lose contrast, sometimes when stopped down and in certain conditions a hot spot is visible. Reflections between the rear element and the sensor can also manifest themselves as an inverted ghost image of bright elements of the frame, looking almost exactly the same as those caused by filters.
 
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