For example, if I have a 55-300m lens with a 45cm minimal focus length, what happens when I add a +5 diopter close-up lens? Or what happens if I add a 20mm extension tube?

What’s the best camera for around $1500? These midrange cameras should have capable autofocus systems, lots of direct controls and the latest sensors offering great image quality. We recommend our favorite options.

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This is the distance from the the lens - for a thick lens, it is the distance from the so-called "front principal place". The front principal plane can be anywhere along the lens' axis depending on lens design details for complex, many element lenses.

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You can do the first one but not the second one. To determine focal distance with a diopter lens, you just use the lens formula 1/Do + 1/Di = 1/f, where Do is the object distance, Di is the image distance and f is the focal length. Since a diopter is 1/f in meters, we know 1/f = 5. If your lens is focusing to 45cm, then Do is -0.45 (It's minus because it's on the same side of the lens as the image). Solving the equation, you get the focal distance, which is 14cm.

In all cases the clear working distance for the 200mm closeup lens on a camera lens focused at infinity is 200mm (about 8")

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I can't tell you the clear working distance because I don't know where the effective front of the lens is in space - called the "front principal plane". .

I have used a friend's close-up filters which were awful, mainly because you literally had to be 5mm away from the subject to get it in focus. The image quality was awful as well.

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I have used a friend's close-up filters which were awful, mainly because you literally had to be 5mm away from the subject to get it in focus. The image quality was awful as well.

Here's an example showing the measured locations of the Front and Rear Principal planes for a common Pentax DA 55-300mm lens focused at infinity.

Above $2500 cameras tend to become increasingly specialized, making it difficult to select a 'best' option. We case our eye over the options costing more than $2500 but less than $4000, to find the best all-rounder.

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I can't tell you the clear working distance because I don't know where the effective front of the lens is in space - called the "front principal plane".

A +5 diopter achromatic closeup lens on a 55-300 zoom usually gives excellent results. Like the Marumi +5 or the Raynox DCR 150 (+4.8 diopters).

I was surprised at the large variation in principal plane location for a single lens. To complicate matters more, principal plane locations often vary as the lens is focused (because for IF lenses, focus is achieved by changing the len's focal length.)

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For example, if I have a 55-300m lens with a 45cm minimal focus length, what happens when I add a +5 diopter close-up lens? Or what happens if I add a 20mm extension tube?

I was surprised at the large variation in principal plane location for a single lens. To complicate matters more, principal plane locations often vary as the lens is focused (because for IF lenses, focus is achieved by changing the len's focal length.)

A faster sensor, improved autofocus and video see Nikon's third-gen mid-range full-framer go toe-to-toe against Canon's EOS R6 II and the Sony a7 IV. We feel its all-round ability lifts it to the top of the pile.

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Say we use 20mm extension from tubes or bellows: Magnification@55mm = 20/55 = 0.36X Magnification@300mm = 20/300 = .067X

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For example, if I have a 55-300m lens with a 45cm minimal focus length, what happens when I add a +5 diopter close-up lens? ...

What's the best camera for travel? Good travel cameras should be small, versatile, and offer good image quality. In this buying guide we've rounded-up several great cameras for travel and recommended the best.

But when you put a tube on a zoom, all bets are off. The principal points go all over the place and the focal point is likely to be inside the lens, which is a hard place to shoot from.

Since the focal length is defined as the distance between the rear principal plane and the plane of focus when focused at infinity, the rear principal plane has to move away from the sensor as the lens is zoomed out. The front principal plane moves around too but that's not usually a concern unless you're trying to find out what the working distance is. And, as you note, the location of the principal planes at minimum focus distance is not going to be the same as at infinity focus.

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What’s the best camera for around $2000? This price point gives you access to some of the most all-round capable cameras available. Excellent image quality, powerful autofocus and great looking video are the least you can expect. We've picked the models that really stand out.

By the way, focal distances are usually measured from the sensor and not from the front of the lens, so if you got 45cm from the spec sheet, it's not the number you want.

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If you want a compact camera that produces great quality photos without the hassle of changing lenses, there are plenty of choices available for every budget. Read on to find out which portable enthusiast compacts are our favorites.

I take this to mean adding an extension tube instead of a close-up lens; in this case, for the lens focused at infinity;

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Therefore adding a +5 Diopter (200mm) closeup lens to your zoom lens results in: magnification@55mm = 55/200 = 0.27X magnification@300mm = 300/200 = 1.50x

Leica has announced the Q3 43, a variant of its full-frame fixed lens compact with a 43mm F2.0 normal lens. We've had the chance to use and test it, to produce an in-depth review.