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January 23, 2013
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A Question about Aperture...

:iconmeggylou:
meggylou Featured By Owner Jan 23, 2013  Hobbyist General Artist
The Aperture on my Camera can only be used between F3.5 and F8. Is there any way I could extend the performance of the aperture??
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:iconmylifeinfocus:
MyLifeInFocus Featured By Owner Jan 26, 2013  Hobbyist Photographer
I've shot long exposures on a point and shoot that can only go to F/8 as well, although limiting there are possibilities. With an overcast day early in the morning or late in the evening will give you minimal yet usable amounts of light. If you have a *fast* flowing stream rather than a calm one it won't take as long to blur the water properly. And the final solution that others have mentioned is get yourself a neutral density filter, something like this: [link]
(I haven't used Tiffen filters and cannot speak to their quality)
To which millimeter size you want, either get the smallest you can get away with (measure the diameter across the front of your lens) because that will be cheapest. Or keep in mind if you ever want to get a dSLR with that you may want to get a size that will fit your lenses in the feature should you choose to upgrade.
Hope this helps :) Hope you get some silky smooth water shots soon!
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:iconinstinctbylaw:
InstinctbyLaw Featured By Owner Jan 23, 2013  Hobbyist General Artist
Aperture SCIENCE, that's all you need to know!
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:iconjoergens-mi:
joergens-mi Featured By Owner Jan 23, 2013  Hobbyist Photographer
Your camera is a Canon PowerShot SX150 IS [link]

The available apertures are F3.4, F3.5, F4.0, F4.5, F5.0, F5.6, F6.3, F7.1, F8.0 see page 67 in the english handbook.

The reason for that is that there is a relation between sensorsize and the maximal usable aperture typical values are Aperture 16-22 for 135mm Aperture 11-13 for APS.-C the relativ small sensor 1/2,3 inch would give you very blurred and unsharp pictures with aperture beyond 8.

This 8 will be nearly the same as an 16-22 at the 135mm format, so you get all of the Depth of field that is possible

The only way if there is to much light is to use a lower ISO-Value ora a a grey filter (i. e. Cokin :) :) )
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:iconmeggylou:
meggylou Featured By Owner Jan 23, 2013  Hobbyist General Artist
sorry.. i wrote the wrong thing the other day. it is a canon sx160is
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:iconjoergens-mi:
joergens-mi Featured By Owner Jan 23, 2013  Hobbyist Photographer
doesn't matter. The sensor is of the same size. I think you will find the same in your handbook of the camera
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:iconjoergens-mi:
joergens-mi Featured By Owner Jan 23, 2013  Hobbyist Photographer
135mm means ''full frame'' 24*36mm
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:iconkingstephenarthur:
KingStephenArthur Featured By Owner Jan 23, 2013  Student Photographer
hmmm, something doesn't sound right here. haha.

well we need more information. what camera are you using? what lens are you using? what camera mode are you shooting in? manual, AP, SP?
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:iconmeggylou:
meggylou Featured By Owner Jan 23, 2013  Hobbyist General Artist
Canon sx160is = camera
Well it says on the camera.... canon zoom lens 16 x IS 5.0 - 80.0mm...
Modes... tried all of the above
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:iconkingstephenarthur:
KingStephenArthur Featured By Owner Jan 23, 2013  Student Photographer
well I hate to say it but with that type of camera it may just be that you can only shoot between 3.5 - 8 :(
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:iconmeggylou:
meggylou Featured By Owner Jan 23, 2013  Hobbyist General Artist
Aww.. I was gonna try and take photos of streams and stuff looking all silky... Oh well, thanks for caring :D
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:iconolda-g:
Olda-G Featured By Owner Jan 26, 2013  Hobbyist Photographer
Try going on a very overcast day or pre-dawn or dusk. The low light will give you the shutter speeds you need.
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:iconfallisphoto:
FallisPhoto Featured By Owner Jan 23, 2013
That has nothing to do with aperture. It's shutter speed that gives you that effect. Either shoot in low light or shoot through a ND filter. You want a long exposure, so use a tripod.
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:iconmeggylou:
meggylou Featured By Owner Jan 23, 2013  Hobbyist General Artist
Ok thanks a lot
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:iconrcooper102:
rcooper102 Featured By Owner Jan 23, 2013
Shoot through a neutral density filter. :) While you might not be able to find a holder to fit your camera you can always get a square one and rig something up to hold it in front of the lens.
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:iconmeggylou:
meggylou Featured By Owner Jan 23, 2013  Hobbyist General Artist
I have been looking into that.
Thanks!
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:iconkingstephenarthur:
KingStephenArthur Featured By Owner Jan 23, 2013  Student Photographer
I have neutral density filters and I just use my hand to hold them in front of the lens. works perfectly fine.
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:iconmeggylou:
meggylou Featured By Owner Jan 23, 2013  Hobbyist General Artist
So they would work for my kind of camera?

:D Thanks
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(1 Reply)
:iconkingstephenarthur:
KingStephenArthur Featured By Owner Jan 23, 2013  Student Photographer
well you still might be able to. at f8 you only need the camera to be open for 1 second even less to get a silky stream.
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:iconrcooper102:
rcooper102 Featured By Owner Jan 23, 2013
Aperture is the size of the hole in your lens that allows light to pass through. The lower the F number the more open the the lens is. The more open the lens is the more light it lets in but also the smaller the depth of field is.

The available aperture settings are dependant on the lens itself and is a reflection of how much the lens can open up and how much it can close down.

If you were to buy a lens with a great capability to open up then you will be able to open it wider than 3.5. For example a 50mm F1.8 can open up to F1.8.

I haven't ever encountered a lens that is limited to not closing down farther than F8 though? Most lenses can close down to about F22. I have used some older lenses but max at about F16 but never as low as F8. What lens are you using? Perhaps there is something wrong with it?
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:iconfallisphoto:
FallisPhoto Featured By Owner Jan 27, 2013
I have one like that, but it's an Anthony and Scoville lens made in 1898. It stops down to f/256 too. Came with the wreckage of an Ansco vest pocket camera. I've been looking for a 6x9 plate camera I can mount it on.
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:iconmeggylou:
meggylou Featured By Owner Jan 23, 2013  Hobbyist General Artist
Well I am using a point and shoot camera... a canon sx160is and it only really comes with the one lense. I am not even sure if you can buy new ones for it
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:iconrcooper102:
rcooper102 Featured By Owner Jan 23, 2013
Ah, no, you can't change lenses which means you are probably stuck with the aperture range that is built into the camera.
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:iconmeggylou:
meggylou Featured By Owner Jan 23, 2013  Hobbyist General Artist
Aw.. Ok. Thanks though
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