the good thing about loading your own 35mm cartridges is that
you can have a 'good look' at the perforations first
to make sure that they aren't damaged!

The Makinon looks to be adding a bit of a purple cast which
should be correctable, but could result in PF on chrome, leaves
etc.

Most 135mm's were reasonable being just 4 elements.

Just had a look at the Exif data format it's very messy similar/based on
to tiff format and the data is compressed so I wont be bothering
to take that any further.

In PhotoMe file menu Import/Export Text output... gives a bit
more info, but still not enough.

Too many differences in the Exif for a binary compare.
It's probably partly compressed.

It might be worth taking two identical shots one with say a 50mm A lens and
the other with a series A Zoom... SR Off everything else manual.
Possibly export the Exif data and compare the hex bytes. Any
difference should be the lens ID and looking up those bytes in
future should make it possible to ID the lens from a Jpeg.
Obviously this would be restricted to lenses you have already
compared, but at least it should allow the lens used to be found.

One thing that may change between shots is meter readings?
Two shots with the same lens and slightly different
lighting should show where the meter readings are stored.
The shutter count and time will also change?

The 2x image of the Refconverter is much better than the one off
the 2x M magnifier. The Oly one seems OK and is cheaper, but
reversed..... nicely made though

Nice set of pics!

You would need to do a bit of detective work and find out where it's stored in the Jpeg and because it's binary find out which bytes to convert. There might be an Exif Reader somewhere that extracts it

I stopped using the M 135mm f3.5 in the 1970's partly because of
the f/3.5 aperture, but mainly because of it's poor close focus
distance. I had previously used a Soligor 135mm f/2.8 on the Spotmatic
which was sharp, but of low contrast.

I still have the M 135mm, but I moved over first to a Sunagor 135mm
and then a Ensinor 135mm f/2.8 that focuses down to 1:5 macro which
I think is just under 3ft. Beautifully made lens with very smooth
mechanics. I've got 3 of them and I was impressed with the internal
construction when I took one apart to clean some moisture inside,
also very sharp. I compared it with the Pentax M 135mm and
the Olympus 135mm and it was sharper than both
Very hard to find originally sold by mail order.

I also have a couple of Russian Jupiter 135mm's and a CZ Jena 135.

What you quoted above is just the ID for a Pentax 'A'

PhotoMe doesn't show the proper ID from the xml file which is:

2 0 70 [4]"> 035-070 10-10 00 00 smc PENTAX-A 35-70mm f/4

So 2 0 70 [4] is the unique ID. There's actually 5 lenses in that
group but one's a Tamron so PhotoMe has discarded that because it
already knows it's a Pentax 'A'

Apart from historic reasons this info isn't much use. I wish I
had some way of identifying 'A' lenses from the K-5 Jpegs though,
but I suspect it just isn't recorded.