Hasselblad XCD 28P

[dchew]

Exactly what I was trying to demonstrate with my posts. In actual application if performs well enough. I am not even sure that the color cast issue is due to lens misalignment. It is not symmetrical in my case. The strong color cast at the edges appears to be a function of the f4 aperture in this pancake design? Oblique ray angle? Does anybody understand this better?

I’ve dealt with color casts for several years. I think asymmetric color cast is more normal than abnormal. Not sure why, but I think it has more to do with sensor construction than the lens.
Dave

 

[areallygrumpyoldsod]

Really? Could you give it a try at f4 with an LCC or a uniform white subject?

I already did - hence my comment - but I am waiting for a far less windy day to do so again in more controlled conditions outdoors.
The attached are of an image I snapped this morning and processed my way - WB as shot but Lens correction for HC 4/28mm applied. The target was not vertically aligned hence the top to bottom shift.
Yes - we need actual lens correction profiles for this lens in Phocus, LRC and DxO (PR3/PL6).
AND NO I will not post uncorrected images.

 

[FloatingLens]

I hoped that Hasselblad will update their automatic lens correction data to fix this issue on the 50c. It seems for the time being, one has to create a Scene Calibration at the larger apertures which can counter the effect. It also handles the light falloff well.

See re-export of my original test image taken at f4 below:

 

[TechTalk]

...Lens correction for HC 4/38mm applied...

There is no "HC 4/38mm" lens from Hasselblad. The lens correction tool shows you applying the Adobe lens profile for the HCD 4/28 from the H-system. Is that the lens you were using?

 

[areallygrumpyoldsod]

There is no "HC 4/38mm" lens from Hasselblad. The lens correction tool shows you applying the Adobe lens profile for the HCD 4/28 from the H-system. Is that the lens you were using?

post corrected

 

[tenmangu81]

I hoped that Hasselblad will update their automatic lens correction data to fix this issue on the 50c. It seems for the time being, one has to create a Scene Calibration at the larger apertures which can counter the effect. It also handles the light falloff well.

See re-export of my original test image taken at f4 below:View attachment 206426

Processed with Phocus last version ?

 

[FloatingLens]

Processed with Phocus last version ?

Yes, Phocus 3.7.5, which introduced XCD 28P support. But the lens correction info alone does not fix it in my particular camera lens combination.

 

[usm]

Yes, Phocus 3.7.5, which introduced XCD 28P support. But the lens correction info alone does not fix it in my particular camera lens combination.

Could you provide a raw file? Have to see it. Thanks

 

[TechTalk]

post corrected

Were you shooting with an XCD 28P lens and applying the lens profile for an HCD 28 mm to the image?

 

[FloatingLens]

Could you provide a raw file? Have to see it. Thanks

Stay tuned.

 

[areallygrumpyoldsod]

Were you shooting with an XCD 28P lens and applying the lens profile for an HCD 28 mm to the image?

YES - LRC has no profile for the XCD 28P lens.

 

[SrMphoto]

I have created a temporary LrC profile for the XCD 28p images:
- Distortion: +8
- Vignetting: Amount +93, Midpoint 0.

 

[FloatingLens]

Could you provide a raw file? Have to see it. Thanks

For anybody who's interested, here are some Dropbox links (3F format):

Test scene XCD 4/28P at F4

B_03850.fff

Shared with Dropbox

www.dropbox.com

White LCC target for Phocus Scene Calibration (XCD 4/28P at F4):

B_01228.fff

Shared with Dropbox

www.dropbox.com

 

[tenmangu81]

Thanks Johannes !!
Scene calibration and lens corrections seem to do the job. Otherwise, the magenta cast is terrible !

 

[FloatingLens]

Yeah, as one of my first images I managed to pick a notoriously bad example since the periphery is grey clouds.

 

[tenmangu81]

I have created a temporary LrC profile for the XCD 28p images:
- Distortion: +8
- Vignetting: Amount +93, Midpoint 0.

Is this working also for correcting the magenta cast (if any) ? I don't have any XCD28P (yet).

 

[SrMphoto]

Is this working also for correcting the magenta cast (if any) ? I don't have any XCD28P (yet).

There is no magenta cast with X2D.

 

[FloatingLens]

There is no magenta cast with X2D.

No vignetting also?

 

[MGrayson]

No vignetting also?

There’s a lot of vignetting if not corrected .
Phocus corrects it fine.

 

[0beone]

Funny (or not) but in shooting snow scenes, I see the cast mostly predominant both sides of the image, as in not like a traditional vignette... go figure. I have sent an image to Hasselblad for review.