There are always a number of those macro lenses on E Bay, usually going for a lot of money. Stupid when you can get an F series 100mm for about £150 !

I had to look that place up - and damn - I've been next to it a few times and didn't know about it !

If you used ND filters on these you'd end up with a sea full of condensed milk.

I'm highly tempted but can I get it past SWMBO ?

Intriguing. I shall be looking for them now.

What a super productive walk. I love the way that each has been isolated with nothing to distract from the detail. There's nowhere to hide with this sort of photography and you certainly don't need to here.

Bee bothering is always fun but the hoverfly steals the show here!

I think it only gets knocked because of its f2.8 brother in either A or K format.

I have been slowly going through my A series lenses with the F 1.7x and it gives uniformly superb results. It does need a lens of f4 or wider (officially - although f4.5 will often work). I didn't think about putting it on a DA*300 - wow - quality 510mm ! If you want it to work with M42s you need to make the same modification to the rear of the M42's mount that you need to do with a Jessop's auto PKA extension tube set. Looking at the front of the 1.7x TC it needs to short out the 1st data pin that is at about the 7 o'clock position. The results with a Zeiss 135mm are amazing.

Well, they are different.