I am new this forum and hope that the following subjects haven't been covered.
I have 2 subjects I would like to discuss.
1) Resolution in 'lines per picture height' (Lpph).
a) I am puzled by the numbers quoted in the reviews. As an example, in the review for the Canon 400D ( http://www.cameralabs.com/reviews/Canon ... ge4b.shtml
), the first chart shows the 400D with 2000lpph, 18-55mm EF-S at 35mm, f8, 100ISO.
The 400D has a sensor size of 22.2 x 14.8 mm, and a maximum picture size of 3888 x 2592 pixels. However, the 2000lpph over 14.8mm picture height implies a vertical resolution of at least 2000X2 pixels = 4000pixels. Since the sensor only has about 2393 pixels in it's height, how is this possible?
b) How is lpph converted to equivilant dpi. I have seen references to this as 2Xlpph - a line pair being one blacK and one white line. I have also seen references where they say that 1 pair is 2 sets of lines requiring 4 pixels each. Could you please explain the how to convert an lpph reading into an equiv dpi?
2) I think that your reviews with the test results is the best there is. Comparison of like cameras is great. even for the purposes of upgrading from all in one large cameras (such as the Fijifil S9500) to DSLRs. But I have a problem.
I have used a 35mm Canon AV1 with a Sigma 39-700mm zoom for years. My wife won a Ricoh Caplio G4 Wide about a year ago and stated using it. I is a versitile camera. 28mm wide angle, 3X zoom and small size. But, it has a couple of major problem. In auto mode without flash it is quite ready to jump to ISO800. With flash, which is only good to around 2.5 meters, after that it compensates again by increasing sensitivity up to ISO800. The trouble with this is that the pictures are so noisy that they are vertualy unusable. I certainly wouldn't want to say to anyone "look at this, I took this photo". I have read some good reports also about the Canon Ixus 850IS on other websites.
Now to my question. I would like to upgrade to a compact like the Canon 850IS, Fijifilm S9500, Sony Alpha A100 or Canon 400D. I am able to compare all of them except the Canon 850IS. In your reviews you mention upgrading, and at times you include the previous models like the Canon 350D in the test results but there never is a high end compact included in the test results. Maybe I am the only one who would like to upgrade from film or low end compact, but I don't think so. Would it be possible to include in your reviews, in the future, a high end compact in the test results such as the resolution and noise performance sections? I am not looking for full reviews for these compacts, I understand that you review high end cameras only.
Thanks a lot