Teleconvertor

These have the useful properties of doubling the focal length while maintaining the same close focusing as the original lens.

I use a Teleplus MC7 seven element one I bought from Jessops in Stoke on Trent back in April 1996 which has works well.
It has a very useful property of having the rear element adjustable to enable life size (1:1) reproduction when used with the 50mm so-called Standard lens for Macro work with the reproduction scale as well as the focus distance marked from when the main lens is set to its minimum focus.

Flash and the Minoltas!

Because the X9 and XD7 do not use though the lens metered flash you need to use either a completely manual flash setting the exposure using a chart in connection with the lens aperture settings or so called computer flash.

The X700 and 500 models can use TTL flash and so I got the Minolta PX360 X700/500 compatible TTL flash unit with a guide number of 36 which covers focal lengths from 35mm upwards. The FDC indicator indicates if the TTL-OFC metered flash was within range

It can be used with the other two bodies with three automatic settings controlled via a sensor on the bottom front of the flash gun or completely manually with the option to reduce the Gn output down to 1/16th if needed.
The head tilts up for bouncing for a softer, less harsh impact.

It was that which led to Minolta discontinuing the 320X flash issued at the launch of the XD7 as it carried over the choice of three aperture settings with the built in sensor for those bodies not TTL-OFC flash equipped in 1981.
I will add the Vivitar 283 flash or even the Olympus system T32 would provide similar control if you were not using TTL flash or own a model without it as an alternative.
If you use a studio flashhead unit for say portraiture you meter that by hand.

Telezoom

 










Tamron 80-210 F3.8-4 58mm Filter thread Type 103A No.21458934

I bought this from Jessops in October 1996 as I was fed up with a modern telezoom (Centon) as much for the gloomy view at the telephoto end at a maximum aperture of F5.6 as the image quality.
Although it was without a case and obviously used with a few bits of paint missing I was and remain impressed by its' image quality which is very good for a zoom. Its' close focusing is good coming complete with its own dedicated lens hood.
It's just too heavy for me to use hand held.

Long telephoto

Minolta MC Rokkor-PE 300mm F5.6

This lens dates back to around 1975 and was the last MC models before the MD series with its additional minimum aperture coupling tab was launched for the XD7 and XD5 cameras  in 1977.
Optically it uses the same glassware as the MD version but due to only having the one meter coupling can't display the correct reading using the XD series Shutter priority exposure mode  although it will work as well as the X700's program mode (although frankly you'd never use program with a long telephoto lens) as both meter the exposure at the point of taking the picture.
Its maximum aperture is par the course for that era so the viewfinder will be a bit dim but perfectly serviceable compared to the shorter telephoto lenses although I'd point out Olympus only offered a F4.5 version for the OM system and the filter thread is a easy to use 55mm.
The practical upshot is so long as like me you could do without using the Shutter priority mode on the XD7, what you do get is actually a really good marque lens for very little money as trying to make a good lens of this focal length is difficult and back in the 1970's and 80's, many independent lens makes struggled to.
They offered okay rather than great lenses at prices people could afford back then new but today there's no reason to limit yourself that way buying used. 
Serial number: 1018533

200mm

200mm f4 Rokkor MD. 55mm Filter thread No: 1223272

I bought this in 2000 used as I found the optical quality is pretty good and find it useful for detail shots of scenes.
It is a good example of the post 1981 version with the minimum aperture lock for the X700's program mode and is a bit lighter than previous versions.

135mm MD telephoto lens.

Introducing the 135mm f3.5 MD telephoto lens.

A few months after my last entry, I've managed to track down a MD series version to fully couple with the Shutter Priority AE mode of the XD7 and program mode of the X700 bodies that have an extra coupling that relays the minimum aperture information to the cameras exposure control system. As with all the MD lenses introduced after 1982, it features the Green coloured minimum aperture selected lock to ensure if you're using it in program mode, your lens can't drift off the right setting.
The version I chose was the F3.5mm version as it only loses a half F stop over the F2.8 classic with the advantages of only weighing 285 grams and using a 49mm filter thread which is the same as the standard and modest wide angle lenses, making using polarizers and square system filters easier in the field.
Lens number 8083468.