Not a mirrorless user but I do use a lot of old lenses on my Pentax bodies. The only real issue I've had is image degridation using the adapters with a lens to get the proper flange distance. Just about unusable. Not likely to be an issue with mirrorless but thought I'd mention it anyways.

I don't use Lightroom so I like to use explorer to sort and cull pics before using Rawtherapee to process. Rather than use plugins I just switched my camera to use the DNG format for raw. Windows supports it natively so no viewing issues.

The symbol at either end of the Latin quote are a superimposed chi & rho, representing Christus. They are both associated with Constantine the Great of the Eastern Roman Empire and are fairly common in the Catholic & Episcopal church.

I remember the echoes as well. Could be annoying as hell at times.
As far as I know, the long haul circuits for voice and data are either fiber or satellite, at least in the western countries. Third world countries I just can't say. I think there might be a few diehard Telex/Teletype users on the old copper lines, just because the circuits are in place.

To nit-pick the nit-pick of my nit-pick (does that make sense? ) and risk boring the couple people finding this entertaining; the time delay between flipping the switch and the bulb turning on is governed by the signal propigation velocity rather than the electron drift velocity.
A (very) imperfect analogy is to think of a simple row of dominos. When you tip the first domino it tips forward a small distance and so on down the line. Each domino falls forward slowly but the last one falls relatively quickly. When you flip the switch the first electron 'bumps' the next one down the conductor until the last electron energizes the bulb. Each electron moves forward at the drift velocity but the signal (light on) reaches the bulb in short order.
Back in college physics one of our labs was to measure the signal velocity of a conductor. I've long since forgotten the details but I'll go out on a limb and say we measured it at around 1700 miles/second. Just don't place too much faith in that number as my memory is most likely in error.
If you're old enough to have used the trans-oceanic copper cables there would be noticable delays in the conversation because of the signal velocity.

Just to make a nit-picking correction. Electromagnetic waves travel at the speed of light. Electricity traveling through a conductor varies depending on the material, amperage, & wire diameter. In copper, figure roughly 1mm/sec. You're looking for the election drift velocity.

The version I recall goes:
Little Johnny is tearing around the house and getting on Mom's nerves so she sends him outside to watch the builders working on the house next door.
A couple hours later, after regaining her sanity, she calls him in for lunch. While their eating she asks him if he learned anything. He says, "I learned how to say 'Just move it over a pussy hair.'"
Mom is aghast and tells him, "Young man, you will not use language like that in this house! Go get me a switch right now."
Johnny replies, "The hell I will! I'm not a f*cking electrician!"

Been shooting Pentax for years and just a couple points to add.
No one has yet mentioned Pentaxforums.com Best resource for all things Pentax.
Also, Ricoh has stated they are supporting the Pentax brand for the foreseeable future so it's not going to disappear (at least not soon.)
There are rumors floating around about some special promotions/events being planned for the 100th anniversary of Pentax next year but the details are being withheld.

Most likely you are thinking of the m42 mount. Developed by Contax and later adopted by Praktica, Pentax and others. Leica used the m39 mount extensively. The m47 was only used by Tokina and had a handful of adapters to other forms.
You are right about Hanimex being a distributor. They were based in Australia and later expanded into the UK. Rarely seen in the US.

I agree Hanimex lenses have a bad reputation. This one, being Tokina, performs reasonably well for a mirror lens. Has the usual center hot spot and donut bokeh but is somewhat sharper than the current crop of Samyang/Opteka/etc. lenses. As it has a 4 digit serial number it would seem to be a limited run as well.
Browsing Google turns up no examples under Tokinas marque, only Hanimex, but the m47 mount identifies it as Tokina decisively.
I'm mostly curious about Hanimex's use of the m47 mount as Tokina dropped it almost as soon as it came on the market and why Hanimex felt the need to relabeled it as the H mount.
As the only other 300mm/6.3 I can find on Google is also a Tokina, I'm speculating on very little evidence that Tokina revived this design for the mft system lens.

I recently bought a vintage Hanimex lens on auction and have been curious about it's pedigree. It's a 300mm f/6.3 mirror lens with a 47mm screw mount, which would indicate a mid-60s Tokina origin. There were adapters to m42, Minolta, Exacta, etc. However, Hanimex apparently marketed it as using a 47mm H mount.
Can anyone confirm that Hanimex relabeled Tokinas m47 mount as the H mount? Actually stumped Roger Hicks over on the AP forums with this question.
I would also be curious if Tokina revamped the design when they released the 300mm mirror for the mft system. The specs seem to be the same except for the mount.
Robert

New to the forums but a long time Pentax user. If you get into using the vintage glass make sure to educate yourself about the 'Ricoh Pin'. Some old Ricoh lenses have an aperture pin that can cause the lens to jam on the body.
Robert