, me parece que a canon esta reestilizando suas power shot para parecer com as lumix da panasonic, esta canon s90, parece muito com a gf1, tamanho e formato, agora o flash da s90 ficou estranho, quando aberto da um aspecto feio para a maquina.

I recently bought this S90 based on rave reviews. As mentioned in many reviews High ISO performance is pretty good. Actually it's ISO800 quality is close to some previous generations ISO200 ( My other Powershot A610). But it seems some cheating is going on with ISO rating here (or may be Aperture). I tested the few camera with same settings and S90 requires twice the exposure time(half the shutter speed). Ex: .

Scene1same shot,same time) .

Canon A610 :Aperture 2.8, ISO 200 requires 1/30sec, .

S90 requires 1/15sec for same shot for correct exposure with same aperture(2.8) and ISO200(no compensation used). Scene2same shot,same time) .

Canon SX200 :Aperture 3.5, ISO 400 requires 1/50sec, .

S90 requires 1/25sec for same shot for correct exposure with same aperture(3.5) and ISO400(no compensation used). I also tested with several other Canon point and shoot and also my Canon XS (1000D). In all cases it results are same. It is one stop slower at pretty much all apertures and ISOs. It seems either S90 actual ISO is not what it is indicated, means when camera indicates ISO 400, it is actually using ISO 200 to show impressive result for the rated ISO. Or The Aperture is does not really starts at indicated F2.0, but in realistic sense it is one stop behind(F2.8).

I got this camera for flash-less indoor photos for my kids, with assumption it has fast 2.0 lens, and has good sensitivity. But shutter speed always half of my old camera which make this S90 not much useful(somewhat usable with ISO 800 though). Now, I feel Canon somewhat cheated with giving wrong ISO sensitivity. I would greatly appreciate if Dave can dig into this and shed some lights on matter, and get the truth out..

Hello..... Can you please consider my request provide the info/test the issue about slow shutter speed issue?.

Chinna: Your request has been passed to the review team. Forum Admin.

Thank you verymuch for passing my request to review team!! Hope I will see some details soon!!.

Hi Guys, Just following up to see if any tests has been conducted, and conclusions? Thanks.

The problem with your test is that you are also testing metering. It could be that it is simply more conservative. To test this, take a picture of a blank white wall in manual mode with a fixed ISO, aperture and shutter-speed. Do this for each camera. Then look at the image. If the image is the same, then metering is difference.

Sometimes it is off by 1/3 stop but it should not be more than that. - Itai .

Www.neoluminance.com.

Just to clarify, mine is not test, but rather real world usage scenarios. Anyways, when I was experimenting, I did try reducing exposure to increase the shutter speed on S90. But I could not go below 1/3 which is already very dark. In the essence I could get same shutter speed in same scenario with proper exposure..

I was not expecting replies from people who never even touched this camera. I was expecting a test by Dave, as he is the one I trust most for honest Camera testing. Dave please do this test, and please suggest any work arounds if you are aware of without going on to insane ISOs..

Sorry, I meant to say, I could not get same shutter speed with all other things being equal with proper exposure..

I own Canon's S90 and Canon's 5D Mk2 and 7D dSLRs. My exposure results are similar not the same in gap as you experienced. My S90 was giving slower performance by about 1/3 stop or so it seems. For a probable answer, look to DXO Mark (the people that test raw sensor performance including actual vs marked ISO). If the camera shoots raw they will test it. According to their test findings the marked ISO on both the S90 and G11 are rather accurate while most other cameras including my 7D and 5DMk2 have lower than marked ISO by about 1/3 stop.

Highlight a chart point and actual ISO is given. You can check your Rebel and S90 this way by finding them within the models shown but not models without raw ability..

Hi John, Thanks for the info. I did check DXO website, and as per them it seems same. But in practical usage I am seeing this slow-shutter speed issue pretty much all the time in low-light. Ofcourse other than the Canon XS I have, all other are Point and Shoot and does not support RAW. As you said S90 and G11 are pretty much same. I compared the both, and both are taking same settings in similar setup.

But some times, it may not be exactly double, but close to it. I would appreciate if Dave can compare with other PS camera and see why it choosing such a slow-shutter speeds..

Guys, I was hoping to see some response from Dave. It seems they never bothered to look at the requests or not interested in doing the necessary tests for comparison, and that sucks..