Luminous Landscape Forum

Equipment & Techniques => Digital Cameras & Shooting Techniques => Topic started by: Murray Fredericks on February 21, 2010, 04:22:02 pm

Title: Microlenses and TSE Lens
Post by: Murray Fredericks on February 21, 2010, 04:22:02 pm

Hi All,

Doe anyone know if the microlenses on the sensors of the 1d4 and the 50d affect the image when shifting using the tse lenses? This is a no no with the phase one P30 for example...

Cheers

Murray

Title: Microlenses and TSE Lens
Post by: Hoang on February 21, 2010, 07:19:16 pm

Quote from: Murray Fredericks

Hi All,

Doe anyone know if the microlenses on the sensors of the 1d4 and the 50d affect the image when shifting using the tse lenses? This is a no no with the phase one P30 for example...

Cheers

Murray

I have never heard of any issues regarding microlenses on DSLRs having issues with Tilt/Shift lenses.

Title: Microlenses and TSE Lens
Post by: Bart_van_der_Wolf on February 22, 2010, 08:13:34 am

Quote from: Murray Fredericks

Doe anyone know if the microlenses on the sensors of the 1d4 and the 50d affect the image when shifting using the tse lenses? This is a no no with the phase one P30 for example...

Hi Murray,

I can't answer your answer for the specific models mentioned, but if they respond anything like my full frame 24x36mm 1Ds3, then the answer is:

• Yes, in a positive sense with regards to light fall-off. The Canon microlenses mitigate the normal light fall-off due to light rays striking the sensor array surface at an angle. That fall-off is already relatively small due to the retrofocus design of lenses with shorter focal lengths.
• No, not significantly with respect to Color Cast (color shift due to reflection/refraction differences between mostly Red and Blue).

Despite an increased light fall-off e.g. with the TS-E 24mm f/3.5L II at f/8 when shifting from -0.16 to -0.6 F-stops at the max. 12mm horizontally shifted edge of the Full-frame image (so at 48mm off-axis), the R-B Color shading only increases from  -0.027 to -0.098 F-stops at the most extremely shifted corners (less than 0.1 stops more blue in the corners). On a cropped sensor the negative effects are even smaller.

I'd say you'll be hard pressed to see the effects, but there is some effect. The effects on resolution are stronger, so one probably will restrict oneself to less shift anyway, especially on the wide angle TS-E lenses.

Cheers,
Bart