I'm a Nikkor F mount guy myself. Ran across these recently & thought this might be a good use for my old F mounts one day . . .

https://www.amazon.com/Improved-AM-MUG%C2%AE-226228-668-Button/dp/B00PF6GWBA/ref=sr_1_2_sspa?dchild=1&hvadid=78134099294859&hvbmt=be&hvdev=c&hvqmt=e&keywords=camera%2Blens%2Bcoffee%2Bmug%2Bnikon&qid=1613416456&sr=8-2-spons&tag=mh0b-20&spLa=ZW5jcnlwdGVkUXVhbGlmaWVyPUExSDBRWFJQRTM4UElBJmVuY3J5cHRlZElkPUExMDA1MzIwN0tQRE85WDY2Tk82JmVuY3J5cHRlZEFkSWQ9QTAxMzA5MTZXOTI5WTZNRjFSNkYmd2lkZ2V0TmFtZT1zcF9hdGYmYWN0aW9uPWNsaWNrUmVkaXJlY3QmZG9Ob3RMb2dDbGljaz10cnVl&th=1

People keep saying Nikon is losing money. Is that really so or is Nikon actually not selling as much as in the past?

Thailand is not China.

For a long time now, Japanese made products have focused on world-class quality only. From what I can tell, this was a conscious, deliberate move on the part of the Japanese & I believe it has worked well for them. Forexample, Miroku Corporation is a Japanese gun manufacturer & their own models, as well as the Browning and Winchester models, among others, that have been produced there have been famously world class. Most or all Japanese manufacturers make only their best quality, flagship models in Japan while their lesser models are outsourced usually elsewhere in Asia.

But there really is no reason I can see why Japanese designed cameras can't be assembled outside of Japan to the same world class standards as in Japan, provided the cameras, lenses, accessories, etc. themselves continue to be of the very best design to begin with & sufficient quality control measures are introduced, followed, & rigorously enforced. I admit it is at least unfortunate that outsourcing Nikon's best cameras sends a horrible signal, & this will be very hard to overcome.

All of the Japanese camera makers have been badly hurt by smart phone cameras that continue to advance in quality & features w/each new model. This destructive technology has devastated the world's camera industry overall & will continue to eat into all of the manufacturers' sales & not only the Japanese brands. All that will be left of today's camera manufacturers will be selling professional cameras & lenses as well as some other optics lines & if Nikon's gambit works, the other manufacturers will outsource production, too.

I also use the SB-700 and find it a very good & easily managed flash. Also own two SB-400s, one of which I use on my backup camera & the other my wife uses on her D-3300. I can recommend both. In general, I believe Nikon flashes will work best on Nikon cameras because Nikon unwisely, I believe, does not share either their flash/I-TTL specs or lens specs w/OEM manufacturers. I believe @ least for their DSLR lines, they should do so as they are now pretty clearly targeting upper end mirrorless markets and I believe allowing OEMs to produce great & clearly compatible flashes and lenses would actually help Nikon sell camera bodies.

Long ago my Nikon D80 shutter required replacing; understand it was a common malady of that particular model Nikon. Don't know how many shutter actuations when the problem developed. Indication was the dreaded "ER" message. I sent it off to Nikon who repaired it quickly & inexpensively. No problems since & still use the camera occassionally.

Another green car color, this time American. Highland Green was the color of the Mustang GT driven by Steve McQueen in the movie "Bullitt". I like that movie & I like that color of green.

In Minolta speak, an MC lens stands for "meter coupled". Looks like a later, autofocus lens to me but I have never seen one like that specific one. Yet the lens overall design looks like other Minolta autofocus lenses.

Not what you're looking for but in the case of jpegs, the photographer sets up the camera in order to create the images s/he desires in the same manner as the photographer who post processes. In either case it's the photographer who is in charge, not the camera or the computer/software.

Thank you for the very thoughtful & balanced insight and perspective.

Some of the early Minolta MC & MD lens coating were problematic. I found this on "The Rokkor Files" site.

"The quality of the coatings on these lenses (early MC & MD) is as a general rule not as good as those on later MC and MD lenses, and in some cases radioactive compounds of thorium and lanthanum were added to the glass mixture to increase the refractive index. This is apparent in some of the faster lenses such as the 58mm f/1.2 and 85mm f/1.7, where some early versions that included this glass have had their radioactive ingredients progressively decay, discolouring the glass, and giving the images taken with the affected lenses a very warm cast."

Most describe the discoloration as "yellowing". I have one such lens & viewing through it there is a noticeable yellow cast as are the photos taken w/that particular lens. It's a very nice lens otherwise, but is unusable to me in its current state.

I have come to believe videography will supplant photography. From the video one can capture any image to make a photograph if desired.

I have noticed a growing number of well executed & powerful videos lately that are really very moving.

"if 3rd party glass cost the same or greater than the camera manufacture glass, which lens would most folks pick, the 3rd party glass or the camera company glass?"

I believe they would purchases the best lens regardless of brand name.

Another point. It's pretty obvious that often the camera body manufacturers decide not to produce lenses we need. Who knows why for certain, maybe they anticipate insufficient volume would be sold, they need to allocate RDTE resources elsewhere, etc. At least for those lenses, why not encourage the lens manufacturers to make them & to share information to help them do so. Everybody wins IMO.

People buy these lenses for three main reasons, I believe. One, they are often less expensive. Two, they are better lenses than are comparable lenses made by the camera body manufacturers. And three, these particular lenses are not made by the camera body manufacturers in the desired focal length(s) and/or having the desired features.

Photographic manufacturers would all be better off if they would take a collaborative approach.

I believe Canikon & Sony would be better off sharing their information with the lens manufacturers and that doing so would be better for everyone - the camera body makers, the lens makers, and we consumers. The manufacturers would sell more of everything and we consumers would buy more of everything and we would have greater satisfaction with our photographic equipment.

One month ago I successfully had my 1982-purchased & dearly beloved Minolta X-700 fully serviced by Gary's Camera Repair for $60.00 plus shipping. Everything worked out very well and I am well satisfied. Here's the link, but under Gary's repair list (left @ Home Screen), I don't find Mamiya listed; you might email to inquire as I found Gary very responsive & candid.

http://www.garryscamera.com/

I also entered "Mamiya camera repair" on my search engine & found many interesting links, among them this company that does claim to service Mimiyas & other brands.

https://www.precisioncameraworks.com/mamiya

Others here have offered great alternative suggestions, but if one plans to use a camera of this vintage, I believe a thorough going over, cleaning, gasket replacing, & lubrication is a good idea & I also believe this might best be done by someone knowledgeable, experienced, & w/access to replacement parts (likely only cannibalized used parts will be available) if needed.

Good luck & I hope you have as much fun as I am having using my old 35mm camera!

Guessing but perhaps blue tooth was turned on, it could not connect, & therefore D7500 won't fire?