Why are TS-E lenses more susceptible to adapter internal flare?

Mr Keyboard · Apr 14, 2016

I have seen quite a few threads about image quality degradation (e.g. flare, lower contrast) due to adapter internal flare when adapting TS-E lenses onto Sony bodies. I don't understand why there is such a difference. Also,when upgrading from Mark III to Mark IV, Metabones makes the opening in adapter larger and claims this improves performance of TS-E lenses. I don't understand this either. Isn't the opening on Canon DSLR bodies just 36x24? Why is there a need to larger opening?

brightcolours · Apr 15, 2016

Mr Keyboard said:
I have seen quite a few threads about image quality degradation (e.g. flare, lower contrast) due to adapter internal flare when adapting TS-E lenses onto Sony bodies. I don't understand why there is such a difference. Also,when upgrading from Mark III to Mark IV, Metabones makes the opening in adapter larger and claims this improves performance of TS-E lenses. I don't understand this either. Isn't the opening on Canon DSLR bodies just 36x24?

No, quite a bit bigger.

Mr Keyboard said:
Why is there a need to larger opening?

Compare it to the A7 series:

TS-E lenses (any tilt/shift lens in fact) directs the image projection fron a side. That is why with those lenses a smaller opening is a hindrance sooner than with other lenses.

Mr Keyboard said:
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Flickr https://www.flickr.com/photos/tianmingchen

Lightshow · Apr 15, 2016

Mr Keyboard said:
I have seen quite a few threads about image quality degradation (e.g. flare, lower contrast) due to adapter internal flare when adapting TS-E lenses onto Sony bodies. I don't understand why there is such a difference.

The imag circle the the lens projects is much bigger than most lenses, for example the TE-E 17 can cover a medium format sensor, so it's much more likely to have issues with adapters that don't have a good non-reflective light path.

Mr Keyboard said:
Also,when upgrading from Mark III to Mark IV, Metabones makes the opening in adapter larger and claims this improves performance of TS-E lenses. I don't understand this either. Isn't the opening on Canon DSLR bodies just 36x24? Why is there a need to larger opening?

Mr Keyboard · Apr 15, 2016

brightcolours said:
Mr Keyboard said:

I have seen quite a few threads about image quality degradation (e.g. flare, lower contrast) due to adapter internal flare when adapting TS-E lenses onto Sony bodies. I don't understand why there is such a difference. Also,when upgrading from Mark III to Mark IV, Metabones makes the opening in adapter larger and claims this improves performance of TS-E lenses. I don't understand this either. Isn't the opening on Canon DSLR bodies just 36x24?

Click to expand...

No, quite a bit bigger.

brightcolours · Apr 15, 2016

Mr Keyboard said:
brightcolours said:

Mr Keyboard said:

I have seen quite a few threads about image quality degradation (e.g. flare, lower contrast) due to adapter internal flare when adapting TS-E lenses onto Sony bodies. I don't understand why there is such a difference. Also,when upgrading from Mark III to Mark IV, Metabones makes the opening in adapter larger and claims this improves performance of TS-E lenses. I don't understand this either. Isn't the opening on Canon DSLR bodies just 36x24?

Click to expand...

No, quite a bit bigger.

Mr Keyboard said:

--
Flickr https://www.flickr.com/photos/tianmingchen

Click to expand...

Click to expand...

I can see the mount diameter is indeed much larger, but the opening right above CMOS does not seem larger than 36x24 except it has more space on the side for mirror movement.

The inside is much larger than 36x24 (the green sensor part is quite a bit smaller, look again), and the mount itself is even larger (lenses are designed for this mount).

So that, + the off-axis projection of the image by the lens, make the need for the differences.

Mr Keyboard said:
--
Flickr https://www.flickr.com/photos/tianmingchen

Mr Keyboard · Apr 15, 2016

Thank you!

danielarev · May 9, 2016

Hi all

I own a Sony a7. I use a Metabones iii version to attach my Canon 17 and 24 tse lenses to the camera. I am experiencing light reflection issues, whenever a light source is at front angle relative to the lens. When this happens, i get light reflections "smeared" across the frame. If i dismount the adapter+lens off the camera and use a flash light, infront of the lens at an angle- i can clearly see a light spot at the side "walls" of the adapter that probably bounces into the camera's sensor once mounted. I have used some "super black" anti reflective material to cover the inner parts of the adapter. It helped to reduce these reflections, but still did not solve the issue. I know that Metabones have used flocking material on their iv version, and i have read this still does not help.

If anyone out here has any kind of a solution or any kind of good advice, i will be forever grateful.

Cheers

Daniel

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Why are TS-E lenses more susceptible to adapter internal flare?

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Lightshow

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