Gear Talk > Lenses

Samyang 35 1.4 adds grain?

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FunkyJam:
Hey,

I recently acquired the Samyang 35 1.4 and yesterday while I was testing it I found something strange. So, when I use f22 and I look thru the viewfinder I realized it has alot of grain. Is this normal? I have a Canon 50 1.8 and I never noticed something like that. I used a 7D.


Is it a bad copy?

Thanks alot as always ;)

Policar:
That's normal.  Put the 50mm f1.8 on, stop down to f22, and press the depth of field preview button--it will look the same.

Most lenses are always wide open through the viewfinder then they stop down briefly before each photo is taken.  The Samyang is fully manual and does not do this; it's like the DOF preview button is on all the time.  The grain is the texture of the ground glass.

FunkyJam:
Thank you alot ;)

ecka:

--- Quote from: Policar on July 14, 2012, 12:59:30 PM ---That's normal.  Put the 50mm f1.8 on, stop down to f22, and press the depth of field preview button--it will look the same.

Most lenses are always wide open through the viewfinder then they stop down briefly before each photo is taken.  The Samyang is fully manual and does not do this; it's like the DOF preview button is on all the time.  The grain is the texture of the ground glass.

--- End quote ---

+1

I think that the grain comes from 7D's grainy focusing screen, not the lens.

infared:
I think you are BOTH right....The graininess you are seeing is actually a combination of the defraction of the light from the smaller aperture of the lens...hitting the focusing screen.  The refracted light causes/allows you to see the fresnel of the focusing screen....

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