::bc::
Well-known member
hehehe, then when you emptied the bottle there, for sure, is BARREL DISTORTION, an PS won't help with that
)--
::bc::
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S602Z-Raynox 1850PRO-Achiever DZ265
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Why isn't eveyone screeming about barrel distortion?
- Thread starter milbogo
- Start date
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::bc::
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S602Z-Raynox 1850PRO-Achiever DZ265
chris gunn
Veteran Member
You didn't read his post correctly!
He said he used Macro! Possibly with some zoom I imagine.
With zoom on macro on the 602 you can get plenty of pincusion distortion.
A demo pic, ugly but what the hell:
I can only assume he did something as silly (unless it really was the box)
He need only take off the macro.
--
cheers!
Gunn
::bc::
Well-known member
Might be, but your pic shows distortion on BOTH sides!!You didn't read his post correctly!
He said he used Macro! Possibly with some zoom I imagine.
With zoom on macro on the 602 you can get plenty of pincusion
distortion.
A demo pic, ugly but what the hell:
I can only assume he did something as silly (unless it really was
the box)
He need only take off the macro.
--
cheers!
Gunn
If his pic had that too, it wpould be a possible explanation
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Doug Kerr
Forum Pro
mil,
You might want to look at this post and the thread leading up tot it.
http://forums.dpreview.com/forums/read.asp?forum=1012&message=5205148
Doug Kerr
You might want to look at this post and the thread leading up tot it.
http://forums.dpreview.com/forums/read.asp?forum=1012&message=5205148
Doug Kerr
::bc::
Well-known member
Chriss, can you tell me where he mentioned that he used macro, i can't seem to find that in his posts!
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MikeBee
Senior Member
::bc:: wrote:
can you tell me where he mentioned that he used macro, i
In my psot in this thread I gently suggested he looked at his configuration of distance zoom and macro for that is where the crux of the problem may lay other than a warped box !
Mike bee
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can you tell me where he mentioned that he used macro, i
http://forums.dpreview.com/forums/read.asp?forum=1012&message=5198201
In my psot in this thread I gently suggested he looked at his configuration of distance zoom and macro for that is where the crux of the problem may lay other than a warped box !
Mike bee
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Live Band pics http://homepage.mac.com/thesentinel/PhotoAlbum5.html
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::bc::
Well-known member
Per Atle Våland
Active member
Hi Chris
Aha! That got past me. Couldn't find mention of any macro (and really couldn't see why it would be used for this shot).
Found the answer in mils previous thread:
http://forums.dpreview.com/forums/read.asp?forum=1012&message=5198201
(Who is still fond of the s602 lens
)
Aha! That got past me. Couldn't find mention of any macro (and really couldn't see why it would be used for this shot).
Found the answer in mils previous thread:
http://forums.dpreview.com/forums/read.asp?forum=1012&message=5198201
Per-Atle
(Who is still fond of the s602 lens
)Doug Kerr
Forum Pro
So does this mean that we now have three generic classes of geometric distortion, "barrel", "pincushion", and "wine-box", where the latter makes the box joints look funny?
Doug Kerr
Doug Kerr
::bc::
Well-known member
hehehe, looks like it, it occurs a lot when emptied the wine-bottle inside......q
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milbogo
Forum Enthusiast
Hi guys,
I checked my exif data - and found out that I didn't use macro for this pic - I did in another shot which causesd some distortion.
Frustrated,I found a straight ruler and checked the edges of the box again ( I have been working with three boxes)..and discovered that one box did have a slight curve. This must have been the one I used. The curve is very slight (about 1.5mm curve in the centre, however, not at the bottom as presented in the pic). I think the problem has been a combination of seveveral problems identified in the responses above. I believe the pincusion distortion gave exaggerated distortion of the slight curve.
That's the best conclusion I can come to.
Exif data below - not sure if anything here suggests why.
Exposure Bias - 0EV
Focal Length - 23.9mm
Exposure time - 1/10 sec
Apertaure - f5.6
Exposure program - manual control
Exposure mode - maual exposure
White balance - auto
ISO speed rating 100 (200)
Metering multisegment/Pattern
Flash - flash fired - compulsory firing
Focal plane X resolution - 3704 Pixels/cm
Focal plan Y resolution - 3704 Pixels/cm
Thanks for the input. I have learnt a lot from the experience. At least I now know what distortion is, how to avoid it (not using wide extreme & telephoto, & if all else fails - fix it in photoshop!!!)
I think I will go and try the contents of the bottle now. I need it.
Mil.
I checked my exif data - and found out that I didn't use macro for this pic - I did in another shot which causesd some distortion.
Frustrated,I found a straight ruler and checked the edges of the box again ( I have been working with three boxes)..and discovered that one box did have a slight curve. This must have been the one I used. The curve is very slight (about 1.5mm curve in the centre, however, not at the bottom as presented in the pic). I think the problem has been a combination of seveveral problems identified in the responses above. I believe the pincusion distortion gave exaggerated distortion of the slight curve.
That's the best conclusion I can come to.
Exif data below - not sure if anything here suggests why.
Exposure Bias - 0EV
Focal Length - 23.9mm
Exposure time - 1/10 sec
Apertaure - f5.6
Exposure program - manual control
Exposure mode - maual exposure
White balance - auto
ISO speed rating 100 (200)
Metering multisegment/Pattern
Flash - flash fired - compulsory firing
Focal plane X resolution - 3704 Pixels/cm
Focal plan Y resolution - 3704 Pixels/cm
Thanks for the input. I have learnt a lot from the experience. At least I now know what distortion is, how to avoid it (not using wide extreme & telephoto, & if all else fails - fix it in photoshop!!!)
I think I will go and try the contents of the bottle now. I need it.
Mil.
Per Atle Våland
Active member
Hi Mil,
This has been fun! If your box is something like 25-30cm high, the 1.5mm is actually what we see in your photo (I measured on a quick print). The fact that the box looks smaller at the bottom is most probably due to perspective... In adition I think we are fooled slightly (I know I was) by the grain of the wood - also curved.
Good luck with the next box pictures!
cheers!
Per-Atle
This has been fun! If your box is something like 25-30cm high, the 1.5mm is actually what we see in your photo (I measured on a quick print). The fact that the box looks smaller at the bottom is most probably due to perspective... In adition I think we are fooled slightly (I know I was) by the grain of the wood - also curved.
Good luck with the next box pictures!
cheers!
Per-Atle
milbogo
Forum Enthusiast
Hi Per,
Yes, we didn't consider optical illusion. But I must say, that looking at the pics again (I posted larger ones)
http://www.pbase.com/milbogo
The slight curve in the box is no where near this distortion in the pic. The pic is really bad, the box is very slight. As you said, it must be a number of reasons.
Now I have bigger issues - working out how to use the flash properly.
I am learning that the lcd gives a poor representation of what is actually taken - especially exposure.
But, I will persevere.....I still love my camera even considering the light stress it has caused.
Kind regards,
Mil
Yes, we didn't consider optical illusion. But I must say, that looking at the pics again (I posted larger ones)
http://www.pbase.com/milbogo
The slight curve in the box is no where near this distortion in the pic. The pic is really bad, the box is very slight. As you said, it must be a number of reasons.
Now I have bigger issues - working out how to use the flash properly.
I am learning that the lcd gives a poor representation of what is actually taken - especially exposure.
But, I will persevere.....I still love my camera even considering the light stress it has caused.
Kind regards,
Mil
chris gunn
Veteran Member
Actually, this Exif data does NOT say that the macro was off.
Are you positive it was?
I have a vested interest in your having it on you know, now I've
taken a test shot etc etc etc 9-)
--
cheers!
Gunn
milbogo
Forum Enthusiast
Hi Gunn,
Not really positively sure it was off. I though exif would show it being on.
I just did some more test shots.
1) Macro on
2) Macro off
The same distortion appear on both.
So it appears macro doesn't make a difference in this case.
I hope this helps.
Mil
Not really positively sure it was off. I though exif would show it being on.
I just did some more test shots.
1) Macro on
2) Macro off
The same distortion appear on both.
So it appears macro doesn't make a difference in this case.
I hope this helps.
Mil
chris gunn
Veteran Member
It is in the exif, but what you posted did not say.
It takes the fun out of it 8-( Oh well. So much for a tidy solution.
--
cheers!
Gunn
chris gunn
Veteran Member
Actually, your data says 23.9mm zoom.
With macro I think you can't go over 18mm. Ergo, no macro.
And 23.9mm is fairly middle of the road. I would have thought that
would be a fairly safe shot to take with minimal distortion.
--
cheers!
Gunn
milbogo
Forum Enthusiast
Per Atle Våland
Active member
Hi again mil,
that was a much better picture for measurement! I took a new print and measured. Approximately 1.2mm with a box height of 22 cm - so if your box is approximately 30 cm high, this corresponds to about 1.6mm bend. Isn't that approximately what you measured?
Ragarding lcd: exposure and white balance can be hard to determine off the lcd while still at the scene, partly due to our eyes and brains fantastic ability to compensate for light conditions. In my (allthough relatively short) experience the lcd performes quite fine - it is my own eyes that are tricking me. In the dark, the pictures look overexposed allthough they are quite all right and in colored light the white balance looks all wrong even if it is not. As soon as I move inside to "normal" viewing contitions, the lcd shows the pictures just fine.
Bottom line: take many pictures and do bracketing as we did with film....
happy shooting!
Per-Atle
that was a much better picture for measurement! I took a new print and measured. Approximately 1.2mm with a box height of 22 cm - so if your box is approximately 30 cm high, this corresponds to about 1.6mm bend. Isn't that approximately what you measured?
Ragarding lcd: exposure and white balance can be hard to determine off the lcd while still at the scene, partly due to our eyes and brains fantastic ability to compensate for light conditions. In my (allthough relatively short) experience the lcd performes quite fine - it is my own eyes that are tricking me. In the dark, the pictures look overexposed allthough they are quite all right and in colored light the white balance looks all wrong even if it is not. As soon as I move inside to "normal" viewing contitions, the lcd shows the pictures just fine.
Bottom line: take many pictures and do bracketing as we did with film....
happy shooting!
Per-Atle
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