Originally posted by: hennessy1
so if you had to choose with the req. ive said which is the absolute best camera that I should buy?
I ask because she wants to get it before we go on vacation next week talk about last minute lol but hey better late then never...
well if you like big zoom in a small package it's basically the panasonic TZ series. the low light performance isn't anything to write home about but it isn't that much different from anything else on the market (other than the fuji super CCD cameras). the difference between the TZ5 and the TZ4 is that the TZ5 has a larger screen with 2x the resolution, and a slightly larger, slightly higher MP sensor. i'd say it's worth the ~$50 premium over the TZ4, going by beachcamera.com prices.
if you're not lugging a laptop around you'll probably want a couple of 4GB SDHC cards from newegg.
as for why are SLRs better? bigger sensors and speed.
the typical 1/2.5" sensor used in compact cameras has dimensions of 5.7 mm x 4.28 mm, or 24.396 sq. mm. the typical canon SLR has a 22.2 mm x 14.8 mm sensor, or 328.56 sq mm. what does that mean? better light gathering capability for the same exposure (amongst other things). almost 13.5x more light gets captured by the sensor on sheer size alone. as 2x the light is one stop, for every 2x the light we're one stop better. taking the square root, we find that the SLR sensor is 3 and 2/3 stops more sensitive. that means less noise. you could set the SLR to ISO 1250 and get the same amount of noise as the compact at ISO 100.
it also means smaller depth of field for a given aperture ratio and field of view. with an SLR and a bright lens, say an 85 f/1.8, you can take a picture of something and you can choose to blur the objects just in front of and behind the object. you don't have that kind of creative control with the compact, it simply cannot blur those objects. lots of things that you might not want in focus will be in focus.
(note that the above two paragraphs apply to any camera with a larger sensor, not just SLRs. so rangefinders like the RD-1 and M8, and any compact like the sigma SD-1 also gain those benefits.)
the other thing about SLRs is speed. focus speeds are much faster, boot up speeds are much faster, shutter lag is almost non-existent, shot to shot times are much faster, flash recycle times are much faster. (some of this also applies to rangefinders, not much of it applies to the SD-1)