There are a couple of them here link

Well, that got people talking didn't it?

The 80 - 320 is a very capable lens. I wouldn't part with mine.

We are the traditional camera users. We are useless as far as a modern manufacturer is concerned. Today's audience wants instant results without fiddling of any sort and will amass thousands of images to our hundreds in any given period. We demand quality. They demand quantity and they certainly don't want to change lenses in the middle of doing it. We are happy(?) to lug a K1 around - and even a tripod to support it with our K mount 400 - 600mm zoom mirror lens or a 50mm macro on a bellows. They want it to fit in their designer jeans back pocket and be capable of doing all those things "whip it out quick and shove it back". They want their faces in front of everything; we want to capture subtle nuances of (to them) boring things. Sorry folks. we are yesterday's business models and we won't make corporate postage stamp money against the megabucks demanded by today's big businesses. Once upon a time, you saw single lenses being offered on Ebay. Today, with the writing on the wall, you see piles of them (literally) and piles of old cameras too. Stack em up and get shut of them while you can. It's a gloomy prospect but I tell myself, "act your age (75) and accept what you can't change."

#7 really does the biz for me.

And don't forget the need for good composition as well as 'seeing'. These are very nicely composed.

Beautiful and more beautiful and then, WOW!

Another 'sharpening' trick with Topaz is to process the full size job then resize it to a much smaller format. Then sharpen it again. This is indeed a 'trick' and once you've done it you can't process it any further!
On the other hand, don't give up on the mirror lens. This was shot with the Pentax 400 - 600 zoom mirror at 420mm, hand held
.

I think you will find a problem with 50mm. You simply can't mount it sufficiently close to the sensor. You MIGHT get it to focus as a dedicated macro lens?

How many variants are there of this? Mine is f2,8. Tiny difference but different it is.