Hi--

>We are a group of students at Imperial College London and are currently
>researching for siutable lenses for our project purposes. We are trying to
>investigate spray characteristics of diesel fuels in the fuel injection
>system by photographing the development of the fuel sprays. We would want
>the magnification and resolution to be as high as possible, and we would be
>grateful if you could assist us in our choice of the most suitable lens.

If you do not also need much space between the spray and the front of the lens,
the 60mm f2.8 Micro-Nikkor should work (to 1:1, but greater with a Nikkor
TC14A teleconverter added). Use f8-11, if possible...). If you need more
space, you will need a longer FL lens (90-105, or 200mm, or even 300mm
(achromatic lenses on the front are more effective with the long lenses
than tubes/bellows - though teleconverters can help to increase
magnification without reducing the subject-lens distance).

>We are also wondering if it is possibe to achive a magnification of >1 if we
>are using a 35mm negative, but out ovelall object size is 50mm?? We would
>be most grateful if you could help us. Thanking you in advance.
>
>Yours sincerely,
>
>Miss N. Abdul Wahab
>Miss H. Afzal
>Miss M. Irwin

No, by definition...
Greater than 1:1 magnification on film of a 50mm subject implies an image
size greater than 50mm - and the image area diagonal of 35mm film is about
44mm... The print image size could be much larger than 50mm, though.