Olympus ex 25 extension tube review năm 2024

Imagine you're walking through a botanical garden filled with plants from around the world. You've got your camera in-hand and you're snapping dozens of great shots or so you think. If you've ever taken a bunch of macro shots that looked great on your LCD, but didn't look quite as good on your computer or when printed, you're not alone. For consistently good results, keep these simple things in mind when you're snapping macro shots.

Extension Tube EX-25An extension tube for macro shooting that is attached between the camera body and the interchangeable lens.

Reliable Dust and Drip Proof construction.

  • Manual focusing use is recommended.
  • All measurements are from the imager plane marked on the camera body to the subject.

ISTM with any sort of 1:1 work (I use OM lens with extension tubes, or the 35mm macro, or the 40-150 with the EX25, although that last doesn't get near 1:1), depth of field is a problem. I usually use a ring light and f22 - which, with my OM T10 ringlight, sometimes still needs an ND filter. You get a little diffraction softness at f22 IMO but you get about as much DoF as you'll get.

I also use a tripod and manual focus on the e330 liveview screen (x10 mode) where possible. Camera shake has a huge impact around 1:1 too but with flash you probably can just about do 1;1 in the field handheld - if you don't mind black backgrounds (I dont) and if you manual focus by moving the camera too and fro...

FWIW, here is a handheld "macro" (nowhere near 1:1) with a 12mm OM extension tube and OM 50mm lens, using (ugh) the built in flash. Not a great pic, but indicates what should be possible, with a bit of care and luck:

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Olympus ex 25 extension tube review năm 2024

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Olympus ex 25 extension tube review năm 2024

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Olympus ex 25 extension tube review năm 2024

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Olympus ex 25 extension tube review năm 2024

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Olympus ex 25 extension tube review năm 2024

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Do extension tubes reduce image quality?

It is a hollow tube with no optical elements and does not affect image quality. What the extension tube does is make the minimum focus distance shorter. You'll be able to get closer to the subject and still focus. As a result, you'll have a higher magnification factor than the one provided by the lens.

Are extension tubes better than close up filters?

Extension tubes are more expensive, but also a more versatile option. They show the best results with wide angle lenses, but strongly lose out to close-up filters on telephoto lenses. Rings do not have optics, and therefore do not bring distortion into the image.

What does a 25mm extension tube do?

The Canon EF 25mm Extension Tube II is used to allow a lens to focus closer than it does natively. This is accomplished by moving the lens 25mm farther away from the camera body's sensor/film plane by fitting between the camera body and the lens. The end result of focusing closer is a larger magnification.

How much magnification do extension tubes add?

An extension tube increases lens magnification by an amount equal to the extension distance divided by the lens focal length. For example, adding a 25 mm extension tube to a 50 mm lens will give a magnification gain of 0.5X.