400D Underexposure problem

[xkingx]

Sorry you have been misled.

Even if you had both the HK warranty card, it's not valid outside HK. So, it's useless. AFAIK, only lenses have international warranty.

I suspect you'll pay about S$50. In reality, they can fix it for you within 15 minutes. But they'll most likely ask you to come back few days later. You can also request for express service but that requires a small fee (~$30, I think).

Please bring your kit lens (or any lens with largest aperture of f/3.5 or smaller) with you.

I see.. OK! thanks alot man.. guess have to make a trip down next week.. haiz.. a few days without my cam is as good as hell~~~!!!

 

[swishbrade]

I see.. OK! thanks alot man.. guess have to make a trip down next week.. haiz.. a few days without my cam is as good as hell~~~!!!

Yah I think he may be right. There is a difference btw a HK warranty and an international warranty. And for my case, it was a lens which I sent in. Should have indicated that earlier. Sorry about that.:embrass:

 

[swishbrade]

Technically they are the same. But you may find yourself running out of +ve exposure compensation as the 400D only offers compensation from -2 to +2 eV. Also, if you shoot in Auto mode, there's no exposure compensation option.

Thanks!

 

[rgborj]

After reading all the post in this thread, I decided to have my camera checked.

I also want to send my 400D for service, but the problem is, I lost my receipt.

When I threw away the Best Denki plastic bag, it was still inside. :cry: But the warranty card states the purchase date, I am not sure if I can get a copy of the receipt from the store.

 

[Junye]

did u register online? if so den they will have ya records.

my exposure problem is ok now.

Took this the following evening.

 

[digital601]

did u register online? if so den they will have ya records.

my exposure problem is ok now.

Took this the following evening.

What lens are you using?
I see barrel distortion.;p

 

[DLord]

I suspect my 400D has an underexposure problem too - only pics with +2/3EV comes out seemingly correctly exposed. I also tested with my 430EX, and required +2/3 flash exposure compensation for the pic to turn out "right". Results were similar with the built-in flash (requires +2/3EV FEC).

Was wondering if fellow 400D users had the same underexposure issue with using the flash?

Gonna send my in to Canon really soon...

 

[ArcticFox]

Oh no

Need to send to canon liao...

 

[foreverlovex]

any idea can i still send to the Canon shop (or whatever u call it) @ Funan?

or strictly harbourfront

 

[Junye]

kit lens.
still saving for my 17-55mm f2.8. or 17-40mm f/4L. :dunno:

What lens are you using?
I see barrel distortion.;p

 

[thw]

kit lens.
still saving for my 17-55mm f2.8. or 17-40mm f/4L. :dunno:

What's so bad about barrel distortion???? It's the easiest flaw to correct. I can never understand this fixation with barrel distortion.

BTW, at 17 mm, the 17-55 f/2.8 IS has 2% barrel distortion while the kit lens and L lens both have 2.5%.

 

[myong]

Is there a systematic way of testing a 400d unit to examine whether it has the underexplorure problem? Woudl appreciate your help. Cheers.

 

[thw]

If you take a photo of an even-toned surface, the spike should be a little to the left.

The center of the histogram is 128 (it's a 0 to 255 scale). For sRGB, that corresponds to a 21.6% gray level since gamma = 2.2 and at 0.5 of the total intensty scale (=128), we have (0.5)^2.2 = 21.7%. For Adobe RGB, it's 22.0%. That's brighter than any accepted "midtone" value for automatic exposure.

If you believe that the camera should expose for 18%, then that is a value of 118 in sRGB or 117 in Adobe RGB. That will be at about 46% of the way from left to right, a little bit left of the 50% midpoint. Allowing plus or minus 1/6 stop we get 111-124 in sRGB or 111-123 in Adobe RGB. That's 44-48 or 44-49%.

Therefore, anything in the left half of the center section (fifth) of the histogram is an acceptable midtone.

 

[myong]

Deep. Will try to understand it and test it this afternoon or tonight. Thanks.

 

[ptyap]

If you take a photo of an even-toned surface, the spike should be a little to the left.

The center of the histogram is 128 (it's a 0 to 255 scale). For sRGB, that corresponds to a 21.6% gray level since gamma = 2.2 and at 0.5 of the total intensty scale (=128), we have (0.5)^2.2 = 21.7%. For Adobe RGB, it's 22.0%. That's brighter than any accepted "midtone" value for automatic exposure.

If you believe that the camera should expose for 18%, then that is a value of 118 in sRGB or 117 in Adobe RGB. That will be at about 46% of the way from left to right, a little bit left of the 50% midpoint. Allowing plus or minus 1/6 stop we get 111-124 in sRGB or 111-123 in Adobe RGB. That's 44-48 or 44-49%.

Therefore, anything in the left half of the center section (fifth) of the histogram is an acceptable midtone.

Thanks for this.

 

[gubble80]

Sigh.... Does this mean that if i buy a brand new 400d now, i have to send it at once to canon for the underexposure problem??

 

[Photo Nuts]

My 400D exposed perfectly right out of the box. It only went south after I got the partial mirror replaced (my fault).

 

[gubble80]

Whats your batch or serial number? Hopefully can avoid myself from getting the ones with underexpose problem.

 

[calebk]

i feels my pic quite soft with my sigma 18-200mm. is it considered underexpose?:dunno:

What has softness got to do with under or overexposure?

Softness is a matter of lens focusing/element alignment. Exposure is based on shutter speed/aperture/ISO.

 

[Junye]

eh i just simply use my eyes to judge at the images downloaded from the camera straight.
esp for white objects, they will kinda look grey.

if it's under warranty just bring down to canon svc center lor to set ya heart at ease?
of course it wouldnt make sense if u can't even figure out what's the problem with ya 400d!

it's like looking for fish bones from an egg.


:angel: