I realised I should at least find out about the three lenses in my possession to determine if possible when to use which.
The Sigma 105mm f/2.8 EX DG is a Macro lens
Image credit: http://lensbuyersguide.com/en/lens/show/Sigma/105mm_f2.8_EX_DG_MACRO
designed as a full-frame lens, and on ''sub-frame'' *APS-C sensor-based camera bodies the lens provides an equivalent field of view of 168mm (Canon).
Does not have image stabilization.
*(My camera has a APS-C sensor. This is smaller than a full frame sensor. Full frame are considered to be better, but as in all things photography there is considerable debate about this! You can get perfectly good shots from smaller sensors.)
This Sigma lens also can be used as a normal 105mm short telephoto lens.
This lens is good for close ups, and portraits. Can be used for landscapes.
The Canon EF 75-300mm f/4-5.6 III USM Lens is a telephoto zoom lens, relatively small, very light and very cheap for this focal length range. Does not have Image Stabilisation.
Need to increase ISO for sharp images
Ideal for photographing sports, portraiture, wildlife etc. The lens' telephoto effect compresses perspective and restricts depth of field, effectively blurring backgrounds. At the 300mm focal length it is possible to fill the frame with a postcard from a distance of 1.5 meters.
When shooting handheld, a good rule to use is that the shutter speed should be at least the same number as the focal length of your lens. Example : When shooting a 75-300mm lens on a full-frame 35mm DSLR camera that is zoomed in to 300mm, you should aim for at least 1/300-second of shutter speed; 1/500 is even better
I have begun to use this as my main lens as I think the images are sharper and focussing is much better than the kit lens described below.
And last but not least:
Canon EOS 18-55mm 1:3.5-5.6
This is the kit lens that came with the camera. It is designed as a starter/beginner lens that is low cost. The ideal general-purpose standard zoom. Its 4-stop Image Stabilizer provides great performance in low light conditions.
If you have a kit lens that ranges from 18mm to 55mm (the standard kit lens focal length), then treat it as an 18mm lens and a 55mm lens in one body.
The 18mm is a moderate wide angle lens that is great for landscape, architecture, and environmental portraiture. The 55mm end makes for a short telephoto lens, ideal for compressing perspective when taking portraits or closing in on small details.
The maximum aperture at the 55mm end of most kit lenses is around f/5.6
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