The lens is where your film SLR does most of its creative work. Focal length changes your perspective and framing, while aperture controls depth of field and low-light ability. You do not need a bag full of lenses to cover most photography; three well-chosen focal lengths handle the vast majority of situations. Here is how to think about each.

The normal lens: 50mm

A 50mm lens on 35mm film gives a field of view close to natural human perception, which is why it is called normal. It is the classic first lens: compact, inexpensive and often very sharp. Many 50mm lenses open to f/1.8 or f/1.4, giving strong low-light performance and pleasant background blur. A 50mm f/1.8 from any major system is one of the best value optics you can own, and learning to see at this focal length teaches composition well.

Wide-angle lenses: 28mm and 35mm

Wide lenses take in more of a scene and exaggerate the sense of depth, making them ideal for landscapes, interiors, architecture and environmental storytelling. A 35mm lens is a gentle wide that many street and documentary photographers use as their everyday lens; it feels natural while giving a little more context than a 50mm. A 28mm is wider and more dramatic, useful in tight spaces and for emphasising foregrounds. Both are widely available and reasonably priced across the major systems.

Portrait lenses: 85mm to 135mm

Short telephotos flatter faces by compressing perspective slightly and letting you fill the frame from a comfortable distance. An 85mm is the classic portrait focal length, often available at fast apertures like f/1.8 or f/2 for creamy background separation. A 100mm or 105mm serves similarly, and a 135mm gives tighter framing and stronger background blur. These lenses isolate your subject and produce the flattering look most people associate with portraiture.

Aperture: how fast do you need?

  • f/1.4 and f/1.8: excellent low-light ability and shallow depth of field, at higher cost and weight.
  • f/2 and f/2.8: a fine balance of speed, size and price for most work.
  • Slower zooms: convenient, but usually softer and dimmer than a prime; primes remain the value and quality choice on film.

Building a simple kit

A sensible three-lens kit is a 35mm, a 50mm and an 85mm: wide, normal and portrait. Start with the 50mm that likely came with your camera, add a 35mm or 28mm for wider scenes, and finish with an 85mm or 135mm for portraits. Buy quality primes from your camera's own system to keep the mount consistent and the results excellent. Every camera and lens we sell is cleaned and tested at Boston Camera (波士頓相機), including the aperture and focus, so your glass performs as it should.