These lenses do not work as well in small, enclosed spaces as they cannot zoom out like zoom lenses. Instead, save your 50 mm lens for outdoor shots or shots in wide, open rooms. Wide angle lenses, like the 50 mm lens, will focus beautifully on the closest object to them. For that reason, it is better to frame the subject so that it is the closest object to the lens. Landscape shots where everything is an equal distance away from the lens may not work as well with a 50 mm lens. Don't clutter the shot with too many objects. A 50 mm lens works well with a few prominent objects, not a ton of detail. If you are taking a portrait, make sure that the subject is facing straight towards the camera, not turned off to the side. If you don't, the camera may focus on whatever body part is closest to the camera and blur out the rest. To focus correctly, you need to stand away from the subject. The subject should still be the closest object to the camera. If you're too close to it, however, it won't focus properly. Even in low-light conditions, there should be a direct source of light focused on the subject of the photograph. If you are using the right aperture, the background and other details do not need focused lighting.
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One-sentence summary -- Use the lens in an open room or outside. Choose a single subject for the photograph. Stand about 45 centimetres (18in) away from the subject. Make sure that you have good lighting.

Article: Feline conjunctivitis is classified as either infectious or non-infectious. Infectious causes of conjunctivitis include viruses (feline herpesvirus, feline calicivirus), bacteria, and fungi. Examples of non-infectious causes are foreign objects (e.g., dust), airborne chemicals, and allergies. The most common infectious causes are feline herpesvirus, Chlamydia felis, and feline mycoplasma. Chlamydia and mycoplasma are types of bacteria. Taking your cat to your veterinarian will help you determine what is causing your cat's conjunctivitis. If non-infectious agents are not the cause, your veterinarian will perform different diagnostic tests to identify the infectious agent. Once your veterinarian has identified the cause of your cat's conjunctivitis, they will recommend various treatment options. Discuss these options with your veterinarian. For general conjunctivitis (no specific cause), treatment usually consists of topical antibiotics and anti-inflammatory medications (e.g., hydrocortisone) that go in the affected eye. For feline herpesvirus conjunctivitis, treatments include topical antivirals, topical antibiotics, and oral interferon alpha (suppresses immune response to virus). Topical antibiotics for general or herpesvirus conjunctivitis treat bacterial infections that occur when the immune system becomes depressed after a viral infection. For bacterial conjunctivitis, topical antibiotics are used. Tetracycline works for Chlamydial infections. If a foreign body is stuck in your cat's eye, your veterinarian may need to perform surgery to remove it. Topical eye treatments are available as drops or ointments. If you have a multi-cat household, you will need to isolate the cat being treated. Infectious conjunctivitis can easily spread between cats, so you want to make sure your cat does not infect the other cats. Keep your cat isolated for the duration of the treatment. Eye drops are easier to administer than ointments, but need to be given frequently (36 times/day). Eye ointments can be given less frequently than drops, but are more difficult to administer. If you are unsure how to give your cat the eye medications, have your veterinarian show you the technique before you leave the veterinary clinic. Your veterinarian will prescribe the number of eye drops (if applicable) and how often to administer the treatment. Before applying the eye drops or ointment, you may need to remove discharge around the eyes with a clean cotton ball and eyewash solution. Your veterinarian will recommend an eyewash solution for you. Eye drops will disperse quickly over the surface of the eye, so you will not need to rub the eye afterwards. For the ointment, you will spread a line of ointment across the eye. Since it is thick, you will need to close and gently massage the eyelid to make sure the ointment spreads across the eye. Your cat's eyes will probably looking better in a few days. However, do not stop treatment. This is especially important for infectious conjunctivitisif you stop treatment early, the infectious agent may not be completely killed and may end up causing recurrent infection. It usually takes about 1 to 2 weeks before a cat's eyes fully recover from conjunctivitis. Even if your cat's eyes look better after just a few days, treating her for a week or more will ensure that her eyes fully recover. You may need to treat your cat for up to 3 weeks. Although treatments are available for feline viral conjunctivitis, there is no actual cure. This can make treatment for this form of conjunctivitis very frustrating and challenging. In addition, topical antiviral treatments tend to be very expensive and need to be given frequently. If your cat has viral conjunctivitis, be prepared for lifelong management of the condition, rather than a short-term cure.
Question: What is a summary of what this article is about?
Identify the cause of conjunctivitis. Discuss treatment options with your veterinarian. Isolate your cat at home. Place eye drops or eye ointment into your cat's affected eye. Complete the full course of treatment. Learn about the challenges of treating viral conjunctivitis.