Lightroom/Camera Raw: Lens Correction Profile REQUEST for Canon EF 300mm f/4 IS USM + 1.4x III

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There is a profile without the teleconverter (which I use all the time) but not with. Can't find this anywhere. This is a great combo lens - lens + extender but a profile would really help CA removal. Tried the DNG_Profile_Editor, but that is really beyond me. If this exists, please help!
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Hugh Howarth

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Posted 1 month ago

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Rikk Flohr, Official Rep

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According to this: https://helpx.adobe.com/camera-raw/kb/supported-lenses.html there is currenlty a profile. I have this lens and have used the profile in the past. Make sure you are looking at a raw file and not a JPEG when you are using this as the profile is not available for JPEG. 
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Hugh Howarth

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Thank you very much for the reply. I am looking at the supported lens page you link to and there is no profile for the 300mm WITH 1.4 extender. There IS on for the 300mm f2.8 but not the f4 (unless I am totally blind). Using the extender has introduced more CA than without and I am looking to automate the removal of that. Thank you again.
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Rikk Flohr, Official Rep

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Odd, I have one available. But in any case, lens profiles are more concerned with Distortion and Vignetting. Chromatic Aberration is not really a function of Lens Profile but rather internal calculations by the Camera Raw engine. 
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Todd Shaner, Champion

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Make sure 'Remove Chromatic Aberration' is checked in the Lens Corrections> Profile panel. To remove the remaining chromatic aberration use the 'Defringe controls in the Lens Corrections> Manual panel. Sample the CA fringe with the eyedropper at 1:1 Zoom view. You may need to manually lower the Amount and adjust the Purple Hue sliders to prevent desaturation of objects with similar color (purplish).

The below example was shot with an old Olympus Zuiko 300mm film camera lens that has lots of CA. The default Purple Hue 30/70 settings work well and Amount 5 reduces the CA without affecting similar color objects. YMMV.