In article <3300E94E.1FEC@mit.edu>, cai@mit.edu says...

>Does anyone know the difference between Nikon's slide copy
>attachments PS-4, PS-5 and PS-6?

PS-4 has shifts, PS-5 doesn't, PS-6 only fits PB-6 bellows,
PS-4/5 only fit PB-4 or 5 bellows (I think...;-).

>I am looking for slide copy attachment. I know PS-6 is the
>currently available model. B&H also lists used PS-4 and and
>PS-5. I am wondering what is the difference? I am looking for
>the cheapest setup to make high quality slide duplications. I
>have Nikkor AIS 55mm f/2.5 Mirco and PK13. Also N90s+MF26+SB26.

The above will not work without the bellows...

>I also heard of another slide copy attachment ES-1? What's that
>for?

It is a small variable-length tube with a 52mm thread at one end
(for mounting on the end of your lens), and a slide holder and opal
diffuser at the other - this is what you want, with your gear, for
duping slides. An SC-17 remote TTL cord is useful for moving the
flash to the back of the ES-1, but firing the flash at a white
reflecting card a bit beyond the ES-1 can also work.
Hope This Helps