Does Orange filter on an APO lens change the focus plane?

[IkarusJohn]

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3 hours ago, stefanusj said:

Yellow filter is a useless filter for me. almost zero effect on skintone, except on the mustard closeup photos. just kidding.

I suppose it depends on the lens and the camera.  For portraits on the 50 Summilux ASPH, mounted on my Monochrom, it makes skin tones more flattering.  For landscapes, the drama of the red filter is great.  Orange gets sporadic use …

[xiaubauu2009]

15 hours ago, stefanusj said:

Yellow filter is a useless filter for me. almost zero effect on skintone, except on the mustard closeup photos. just kidding.

Hahhaahah, I used to have yellow one, but didn't:t really see that much of difference, and now I can:t even find it anymore

hahahah.

[stefanusj]

hahaha, yupp the orange is the best value (skintone effects and only 1 stops darker).

2 hours ago, xiaubauu2009 said:

Hahhaahah, I used to have yellow one, but didn't:t really see that much of difference, and now I can:t even find it anymore

hahahah.

 

Edited March 18, 2022 by stefanusj

[xiaubauu2009]

On 3/16/2022 at 7:20 PM, fotomas said:

Instead off guessing I made a quick test with the APO-Summicron 90 ASPH on an M 246. Here are the results:

Distance was about 1,7 m. Fully open, focussed with the EVF on the center of the chart.

First a overview with the total scene:

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2. Detail with no filter

3. with a clear UV/IR cut filter

4. Yellow filter

5. Orange filter

6. Red filter

7. Dark red filter

8. IR 715 filter

As you can see there is a slight focus shift to back-focus the longer the wavelength got. The filters used are the top models from B+W or Heliopan.

Looks like the IR cut product the sharpest image?

[fotomas]

vor 3 Stunden schrieb xiaubauu2009:

Looks like the IR cut product the sharpest image?

Yes - so it is.

[jaapv]

9 hours ago, fotomas said:

Yes - so it is.

Which is no surprise. Any M camera has a residual IR sensitivity - which means that you get a (quite underexposed) unsharp IR image overlaid on your sharp visible-light one.