Many Lowe Alpine packs – specifically the bigger and more technical rucksacks – are available in different or adjustable back lengths. Contrary to popular belief, it is your torso length and not your height that is key to finding a well-fitted pack. Tall people don’t necessarily have long back lengths, just as shorter people may have a long back length.

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Back length is the core of a well-fitting pack, so it’s important to know how long your back is before finding a pack to fit it. It’s a bit like knowing your shoe size before buying a new pair of boots.

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Fresnel produced six sizes of lighthouse lenses, divided into orders based on their size and focal length. In modern use, these are classified as first through sixth order with the sixth order the smallest.  Nobska’s current Fresnel lens, pictured to the right, is a fourth order lens, a substantial size.

According to Smithsonian magazine, the first Fresnel lens was used in 1823 in southwest France near the mouth of the Dordogne River; its light could be seen from more than 20 miles. Nobska’s first Fresnel lens was installed 18 years later in 1841. The current lens was installed in 1888.

Nobska's lens is in good working order and can be seen from the grounds - and up close if you climb the lighthouse tower.

This measurement will give you an idea of which back length to choose and a great starting point for fitting your rucksack.

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Conversely, those with longer focal lengths are telephoto lenses, offering a narrower, magnified perspective. Standard lenses fall in between these two extremes ...

Ask your helper to measure from the bony protrusion at the back of your neck, straight down your spine to where your thumbs point towards your spine when your hands sit on your hips.

Knowing your back length lets you choose the right rucksack to fit your body. Great fit means great comfort, and great comfort means a great experience.

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High-quality glass Fresnel lenses in lighthouses were considered state of the art in the late 19th and through the middle of the 20th centuries; most are now retired from service. However, the technology, in updated form, has many and varied uses including in car head lights, optical landing systems, and for production of solar energy.

Alps Alpine created a compact 2mm-diameter aspherical achromatic lens using high-precision glass molding and glass bonding technology built up over many years.

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Whether you’re trekking the Himalayas or spending the day fell walking in the Lake District, you need a backpack that moves with you across the terrain. The best way to do that is to choose a pack with a good fit for your body, and that specifically fits your back.

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Your back length can be found by measuring from your C7 vertebra (the bony protrusion at the back of your neck, where your neck meets your shoulders) to your iliac crest (level with the top of your hip bones).

Pronounced "frennel" or "fraynel", a  Fresnel lens is a type of compact, multi-faceted lens originally developed by French physicist Augustin-Jean Fresnel for lighthouses. The design allows the construction of lenses of large aperture and short focal length without the mass and volume of material that would be required by a lens of conventional design.  A Fresnel lens can capture more oblique light from a light source, thus allowing the light from a lighthouse equipped with one to be visible over greater distances.

Once you have it, you can check this against the back length of the packs you are looking at to find a good fit. Normally, the amount of inches or centimetres will directly correspond with the numbers on the back system, or be outlined on the hangtag attached to the product.