The Canon Rebel DSLR is what you will want to look at.
Vivitar sell a digital SLR camera that is a 35mm model which can be purchased at Urban Outfitters and is touted as a great camera for either beginners or professionals.
The EOS Digital Rebel XT SLR is great for beginners.
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If you want the best SLR digital camera, I would suggest you check out Best Buy or Fry's electronics. They both have the best deals in SLR digital cameras and come in a good affordable price.
If you are in the market for an slr camera, you should have no problem at Best Buy. The staff is the very best at helping make a decision on one camera or the other based on what your needs are.
There are two ways one can purchase an SLR camera. One of which is online at an electronic retailer such as Best Buy, or at a local camera and electronic store.
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My opinion would be one of the Cool Pix cameras. This site www.digital-slr-guide.com/best-landscape-lens.html has more information as to which camera would be the best.
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A Canon SLR camera can be purchased at many retail stores. Best Buy and Future Shop both carry the Canon SLR, as does Amazon and eBay. Many are listed at various prices.
Yes, your sister can purchase a SLR and DSLR camera online. She can go to the Best Buy website and create an account. Once she does this, she can view various SLR cameras available and purchase one with her account.
When purchasing a digital camera, it is wise to purchase a case or a bag to protect it. SLR camera bags can be found online at Amazon, eBay, Best Buy, and eBags in a variety of styles.