This specific event was rehashed here beyond all reason almost a year ago.

Couldn't agree more. For some photography incredible sharpness wide open is not always advantageous.

These days I shoot mostly with fast manual focus prime lenses on my Nikon Z body including those from Voigtländer, TTArtisan, and others. My three Voigtländers, which are all f/1.2 lenses, are not clinically sharp wide open, but rather have what many refer to as a Voigtländer glow, which inparts a slightly soft and dreamy quality to images when used at f/1.2 to f/2.

For my photography I find their rendition much more useful then some clinically sharp as a scalpel fast autofocus primes available today. And for me the VLs also have an additional advantage of being very small and lightweight for very fast lenses even though they are all metal and glass.

And for what it's worth, given the title of this thread, all my manual focus lenses have either 10 or 12 aperture blades.

It goes for a lot more when new but used filters on eBay are much less expensive.

Yes, that link is for a used filter which is what I believe is what is actually being offered to the OP on eBay. Even though the item for sale on eBay is marked as new, I believe that is because they are unopened and unused filters. However, if the seller is not a primary distributor or dealer but is reselling an item that has been purchased, I believe they need to be marked as used even when they are sold in unopened like new packaging. I have contacted the seller for an update.

Other than the possibility of wasting a few dollars, what other dire circumstances are you alluding to?

It is most likely used. If so it should say so in the offer. The seller has 99.4% positive feedback. First thing I would do is see how much that's specific filter iat that size is sold for new. The ad should also indicate the condition. Finally, you can always contact the seller and ask about it.

eBay customers and sellers generally use PayPal which is very secure.

My day to day preference is fast manual focus prime lenses. I rarely shoot zoom lenses anymore. Again, I was responding only to a very specific statement you posted.

I read your post carefully. I was specifically responding to the first sentence in it, "Primes offer faster maximum apertures." I was just pointing out that there are also very fast maximum aperture zoom lenses. The Sigma 18-35mm has great bokeh and also isolate subjects when used wide open.

""Primes offer faster maximum apertures."

Not always. Specifically, I used to own a Sigma 18-35mm f/1.8 DC HSM | Art crop sensor lens which had an f/1.8 maximum aperture throughout the focal range. It was also extremely sharp edge to edge. It was like having a bagful of fast, high quality prime lenses, including a 20mm, a 24mm, a 28mm, and a 35mm... and, of course, everything in between! It had internal zooming and internal focusing and was built like a tank. It was not small or light, but its size and weight were extremely reasonable considering its capabilities and professional build.

I use fast manual focus wide angle prime lenses most of the time. They are tiny and sharp with great contrast and a lot of character. Using primes lenses forces me to frame my images much differently than I would if I used zoom lenses which I love..

I'm sure there were older cameras that had cables with proprietary connectors before there were universal standards.

That would depend on whether it's some sort of proprietary cable designed specifically for that camera and no longer made. However, I would be surprised about that. It is more than likely you could find a cable to replace it.