SD14 Colorchecker Shots: full specrum + lens filters Comparison

I promise no graphs, spreadsheets or numbers!

I keep the SD14 with it's dust protector removed, mainly for full-spectrum shots or the occasional IR attempt.

One way to revert to visible light shots is to put a UV/IR blocking filter on the lens - far more convenient than messing with and possibly breaking the dust protector. For various reasons, I ended up with three such filters.

With any one of those three on the lens, shots made in the Real World (shrubbery, rolling hills,etc.) come out OK on my monitor screen but hard to compare. Thus it is, with today's bad weather, I was led to use target shots to better compare them. Firstly, color-balanced in SPP and "exposure"-corrected more or less:

Deliberately OOF for easier color-pickin' . . .

Please view original size to see captions and CMY correction amounts

486 is the B+W dichroic UV/IR blocker - kind of close to the dust protector, hence reasonable colors. The other two are optical-type with their capture affected by smooth roll-offs at each end of the spectrum. 'no filter' almost looks reasonable (slight pink cast) but there's very little UV/IR in my living room!

Lighting is a warm LED strip-light for which I use Incandescent WB.

Here's another illustration, Incandescent WB, but NO color-balancing:

Sorry, pane positions are ordered different than the precious illustration.

Again, the 486 looks OK due to it's spectral similarity to the dust protector. Not shown here, however, is the green-hued sides of an image you get with a wide-angle lens (dichroic filters are sensitive to incoming ray angle).

Here, it is obvious that the optical filters are weighted blue-green, the BG38 less so.

The no-filter shot shows the tendency to purples, indicated best by the lower-saturated green patch. Outside, green foliage OTOH comes up brighter red/brown because of the reflected IR.

I showed the SD14 but any Sigma DSLR would give similar results ...