Closeups with 'Blad and Nikon 5T/6T diopters

Hi, all.

I have a Hasselblad with the normal 80/2.8 T* CF Planar. Wanted to

shoot closeups using my Nikon 2-element achromatic closeup diopters

(5T and 6T, 62mm size). They perform really well with my 35 camera

(quite sharp corner to corner at various apertures) but the results

with the 'Blad were discouraging. No vignetting but the edges were

really soft. With the weaker 5T the softness was gone past f16, with

the 6T it was visible even at f22. Surprisingly, both stacked

diopters worked better than the 6T alone. I tested this by

photographing a flat surface (roadmap spread on the floor) with a

very careful adjustment (good bubble level) of the position of the

camera so the film plane was parallel to the map.

Has anyone tried this "shortcut macro" with the 'Blad? I'm wondering,

maybe the diopters are optically not compatible with the lens? The

front element of the Planar is quite a bit recessed, as you know, way

more than in my Canon lens.

(Of course, no need to mention that the bare lens performs perfectly).

Thanks, Piotr

Piotr �

When I looked into the Nikon 5T/6T closeup diopters a while back, I noticed that they are to be used only with telephoto lenses. Nikon's Japan website is very clear on this: "5T and 6T are for telephoto lenses." Other references on the web are consistent with this.

So, I belive the cause of your problem is that your 80mm is just a normal lens. However, I don't understand *why* the 5T/6T can only be used with telephoto lens, but I would sure like to know.

� Bill

Pete

We have been thru this twice before. I have used the 5T and 6T lenses

with a Bay 50-62mm adapter on my 80mm and 150mm (H'blad) with no

problems at all.

Jerry

Yes, I have found those threads about macro (Proxars, tubes, bellows, Nikon diopters). They just didn't seem too conclusive to me. Yes, I have also taken nice shots (mushrooms, forest floor) with the 6T and 5T. However, those subjects were 3D. They were sharp and the surrounding area was naturally out of focus due to shallow DOF. So it's only after I had shot a FLAT 2D surface (nice patterns of a wooden board or pebbles on a sandy beach) did I notice the softness which could be attributed to the diopters rather than DOF.

Anyone out there who noticed something similar? Thanks for your time and input.