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I am an eye surgeon and take photoes for patients with squint (crossed eyes) showing the eyes only. I also need to take photoes to lid lesions which may be 3-10mm only. I already have the 18-105 lens. What is best macro lens for me and my Nikon D90 camera?

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4 Answers 4

Well a few considerations...

  • You need something very sharp for what you do, so putting extension tubes on a zoom lens isn't going to give you your best results there. Zoom lenses, especially with a fairly wide range like 18-105mm are quite a bit softer than a macro or even a normal prime lens. You want either a normal sharp prime lens and extension tubes or a dedicated macro lens for sharpness sake.

  • A dedicated macro lens is going to look more professional and be less hassle, which are both important when working in a professional capacity like a surgeon.

  • You're going to be indoors, under artificial light (which is almost always 'dim' compared to outdoors, even when its considered bright inside) - so you'll want:

    • A good working distance so that you don't block your light source with your lens and body.
    • A large aperture so that you can focus in low light and stop down a little to get it ultra sharp but still not be 'slow'.

There's two lenses that generally meet this criteria, depending on your budget.

The Sigma is the budget friendly option, but the Nikon is definitely the sharper and better lens. The Nikon brings faster, quieter autofocus and a stabilization (VR) to help you handhold in lower light.

(The Tamron 90mm Macro is another popular telephoto macro lens, but its price about equivalent to the Sigma and the Sigma has slightly more reach).

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Re. the light source, perhaps a ring flash would be useful? FYI Kais, a ring flash is a light, usually LEDs these days, that fits around the end of the lens. The light is constantly on as opposed to 'flashing'. –  ElendilTheTall Jul 10 '11 at 8:28
    
@ElendilTheTall - In regards to 'constantly on as opposed to flashing' - depends on the kind you buy. For always on, you want one labeled Macro specifically. –  rfusca Jul 10 '11 at 15:32
    
The equipment discussed here is all good, so I'm not going to add a lot to that part of the discussion. What I would suggest as a costing option is that you get all cross-disciplinary and look at an intraoral kit marketed at dentists -- they are sometimes available without the body, and consist of an appropriate macro lens, a macro flash system (either a ringlight or twin small flashes) and an appropriate case, usually at a very decent kit price. –  user2719 Jul 11 '11 at 21:44

An alternative would be to buy extension tubes for your lenses. You can get great results without having to buy dedicated macro lenses.

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I own the Nikon 105mm f/2.8G ED-IF AF-S VR Micro-Nikkor Lens and use it on a D7000. It is a great macro lens, all-though a little pricy, with a long Nikon history. It is really sharp and will provide a good working distance for your squint shoots. To capture the lesions in detail you will have to get really close (e.g. 1:1 reproduction). I think this lens will serve you pretty well.

However, the VR (Vibration Reduction, Image Stabilization) is a nice ad-on if you need to shoot handheld or use the lens as a short telephoto (maybe squint shoots), but it will not replace a sturdy tripod for serious macro photography, which a 3-10mm subject (lesions) is IMHO.

Since I have the eyes of a sparrow hawk ;-) and never was at an eye surgeon/specialist, I therefore do not really know how you work and how you might use the lens. But you might also want to think about using sturdy tripod with a proper tripod head and fixing the patients head or provide a comfortable backup so the patients head will not shake. I guess as an eye-surgeon you should already be aware of the latter.

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Thank you all for the great advice.I think the 105mm is my best choice. As for my patients, they are mostly children but I do have many adult patients with squint. It would be hard to keep the child still while taking photoes using a tripod. Best regards. –  Kais Jul 12 '11 at 21:41

Try this:

Nikon AF-S DX Micro NIKKOR 85mm f/3.5G IF-ED VR

This lens allows a reasonable working distance (about 5.5 inches) and is reasonably priced at about $500. However, it cannot be fully utilized on FX-format (full-frame) camera bodies.

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