Thank you, Lars.

I stitched three vertical framed to create the image.  Now I found a bit of glitch between the central and the right frames on the rainbow.   

Akira, I didn't notice any glitches - probably just absorbed by the scenery. Great rainbow pano! 

Yoyoi Kusama,

great Japanese artist,

currently exhibited in Cologne.

Phantastic.

If you can, go there.

You have to book online.

It is sold out 14 days in advance.

No chance obtainig a ticket on site.

Yes you need to add an Aperture Follower Tap, so that the camera know the lens is at minimum aperture value smallest opening,,,

The "tap" is only needed for cameras which have an "smallest aperture switch" rather than an "aperture ring feeler".  Those are cameras that are not able to meter correctly using the aperture ring.  Models like the D70, D100, and unfortunately also D7500 (which ditched the aperture ring feeler that the D7200 still had).  They aren't really the best cameras to use with the modified TC-16A anyway.

Those cameras with an aperture ring feeler (D3 to D6, D200-D500, D600-D850, D7000-D7200) only know about "at smallest aperture" by counting the distance in stops from fully open.  That means that for a TC-16A identifying as TC16-A, the aperture has to be set at fully open (which the camera will treat as F1 with respect to matrix metering).  For a TC-16A identifying as a 70-210mm 1:4 (by cutting two traces or pins inside), the aperture ring has to be set 6 stops away from fully open (if fully open means F2.8, you have to set the aperture at F22).  The camera will consider "fully open" as F4 and count from there.

If you cannot do that (like with a mirror lens), you can set the camera controls to leave aperture setting to the aperture ring, and then M and A mode likely work (they won't recognize when you set the aperture ring more than 6 stops away from open I think).

Yesteryear - Leica Q2 - Summilux 28mm @ f/1.7 macro mode

I wish more product photography was like this!