A helpful suggestion: For anyone new to photography, if you are looking for an answer to what you feel may be a basic photographic question, before asking the question on this forum, could you please try the following first: 1. Go to www.google.com or www.yahoo.com and type the keywords of your question into the search box. For example, if you want to know more about HDR (High Dynamic Range) photography, type "HDR" and "photography" into the search box. 2. Look up the subject on wikipedia. Go to www.wikipedia.org, and type in the subject you want to know more about. For example, if you want to know what chromatic aberration is, go to www.wikipedia.org and type in "chromatic aberration". Be aware that correct spelling seems to be necessary to get results from wikipedia. These two steps will make it easier for others on this forum to answer your questions, and for you to understand the answers. Have fun!