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Thread: do film SLRs have sensors of which must be cleaned periodically?

  1. #1
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    Default do film SLRs have sensors of which must be cleaned periodically?

    i know DSLRs have sensors that can attract dust. but is it so for film SLRs? sorry if this is a stupid question. but i ask this because i see some dirt on the top right of my EOS300's viewfinder. its not the lens. so im wondering if there is a 'sensor' taht the dirt rests on, or is it the focusing screen that is dirty.
    Last edited by Isaiahfortythirtyone; 20th February 2006 at 02:27 PM.

  2. #2

    Default Re: do film SLRs have sensors of which must be cleaned periodically?

    Quote Originally Posted by Isaiahfortythirtyone
    i know DSLRs have sensors that can attract dust. but is it so for film SLRs? sorry if this is a stupid question. but i ask this because i see some dirt on the top right of my EOS300's viewfinder. its not the lens. so im wondering if there is a 'sensor' taht the dirt rests on, or is it the focusing screen that is dirty.
    Most likely it is dust on the focusing screen. If you can't remove it by blowing it may be on the inside. I don't know if the focusing screen is removeable on the EOS300. If so, then you may take it out and blow the inside. The only sensors on film bodies are the AF sensors and the metering sensors. Dust on the focusing screen will not affect the image on the film.

  3. #3
    vince123123
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    Default Re: do film SLRs have sensors of which must be cleaned periodically?

    The DSLR "sensor" that you are referring to would be the CCD that attracts dust to stick on it (or more precisely, the AA filter). The DSLR also has a focussing screen which you can see as a vertical "roof" in the mirror box which also can attract dust. The dust you see here doesn't affect your images but may look irritating when you look through the viewfinder.

    The film SLR equivalent would also have a focussing screen and the comments above would apply.

    Quote Originally Posted by Isaiahfortythirtyone
    i know DSLRs have sensors that can attract dust. but is it so for film SLRs? sorry if this is a stupid question. but i ask this because i see some dirt on the top right of my EOS300's viewfinder. its not the lens. so im wondering if there is a 'sensor' taht the dirt rests on, or is it the focusing screen that is dirty.

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    Default Re: do film SLRs have sensors of which must be cleaned periodically?

    The "sensor" for film SLRs are the film. Hence, the problem of dirt on sensor ain't really of concern, since commercial films are relatively dirt free when rolled. The problem may be of concern if you were to bulk roll your own film.

    As for dirt you see through the viewfinder, it could be present either on the mirror or the prism. It will not affect the final image, but it will be a constant irritation to you. The best thing will be to use a blower and hope for the best that the dirt will fall. If not, you would have to send it to a friendly photographic equipment shop to clean it.

  5. #5

    Default Re: do film SLRs have sensors of which must be cleaned periodically?

    Not that I am aware of.

    I am using cameras with spots in the viewfinder and my pictures turn out OK!

    The wonders of the analogue equipment! Little to upgrade. No worry about dust unless shooting in sandstorms!

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    Default Re: do film SLRs have sensors of which must be cleaned periodically?

    maybe the focussing/metering sensors? not sure where they're located though and whether they're prone to dusk and dirt.

  7. #7

    Default Re: do film SLRs have sensors of which must be cleaned periodically?

    Quote Originally Posted by mpenza
    maybe the focussing/metering sensors? not sure where they're located though and whether they're prone to dusk and dirt.
    The AF sensor is usually located below the mirror while the metering sensor is usually located in the prism and measures the light off the focusing screen.

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    Default Re: do film SLRs have sensors of which must be cleaned periodically?

    ahh i think its the focusing screen. not sure if i can remove. but since it doesnt affect the image...i better not go fiddle with it :P

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    Default Re: do film SLRs have sensors of which must be cleaned periodically?

    yep, for film wise, unless you film is dirty.. if not should be ok..

  10. #10

    Default Re: do film SLRs have sensors of which must be cleaned periodically?

    Quote Originally Posted by Isaiahfortythirtyone
    ahh i think its the focusing screen. not sure if i can remove. but since it doesnt affect the image...i better not go fiddle with it :P
    Try just using a blower, it may just be on the outside surface.

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    Default Re: do film SLRs have sensors of which must be cleaned periodically?

    Quote Originally Posted by vince123123
    The DSLR "sensor" that you are referring to would be the CCD that attracts dust to stick on it (or more precisely, the AA filter). The DSLR also has a focussing screen which you can see as a vertical "roof" in the mirror box which also can attract dust. The dust you see here doesn't affect your images but may look irritating when you look through the viewfinder.

    The film SLR equivalent would also have a focussing screen and the comments above would apply.
    That's the downside of DSLRs, having the risk of dust getting onto the CCD or CMOS sensors.
    Canon EOS 5D, 24-70 f/4 L IS, 50 f/1.2 L, 70-300 f/4-5.6 L IS, 600EX-RT. Sigma 12-24 f/4.5-5.6 EX.

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    Default Re: do film SLRs have sensors of which must be cleaned periodically?

    Quote Originally Posted by student
    Not that I am aware of.

    I am using cameras with spots in the viewfinder and my pictures turn out OK!

    The wonders of the analogue equipment! Little to upgrade. No worry about dust unless shooting in sandstorms!
    I'm having the same issue as u with my EOS 30 focusing screen. In the viewfinder can see the tiny black spot and also when the lens is removed. But not matter how i use the blower to blow it, it still sticks there, though it doesn't affect the image in any way.
    Canon EOS 5D, 24-70 f/4 L IS, 50 f/1.2 L, 70-300 f/4-5.6 L IS, 600EX-RT. Sigma 12-24 f/4.5-5.6 EX.

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    Default Re: do film SLRs have sensors of which must be cleaned periodically?

    Quote Originally Posted by lsisaxon
    Try just using a blower, it may just be on the outside surface.
    I tried on mine...it's still there, maybe it's the insides.

    There's also a white speck of dust inside my LCD too.
    Canon EOS 5D, 24-70 f/4 L IS, 50 f/1.2 L, 70-300 f/4-5.6 L IS, 600EX-RT. Sigma 12-24 f/4.5-5.6 EX.

  14. #14

    Default Re: do film SLRs have sensors of which must be cleaned periodically?

    Quote Originally Posted by Snoweagle
    I tried on mine...it's still there, maybe it's the insides.

    There's also a white speck of dust inside my LCD too.
    Awww..

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    Default Re: do film SLRs have sensors of which must be cleaned periodically?

    Do NOT to use cleaning cloth or blower brush on the focussing screen if the dirts cannot be remove from it through blowing. I tried that once and scratch the screen, had to replace a new one at the service centre. If the dirts annoy you badly and does not drop off from the screen after repeated blowing with a blower, just bring in to the service centre and ask them to clean it for you.

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    Default Re: do film SLRs have sensors of which must be cleaned periodically?

    Quote Originally Posted by lsisaxon
    Awww..
    Think have to ask Canon to remove it for me the next time i send it in for general servicing.
    Canon EOS 5D, 24-70 f/4 L IS, 50 f/1.2 L, 70-300 f/4-5.6 L IS, 600EX-RT. Sigma 12-24 f/4.5-5.6 EX.

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    Default Re: do film SLRs have sensors of which must be cleaned periodically?

    Quote Originally Posted by Moonstone
    Do NOT to use cleaning cloth or blower brush on the focussing screen if the dirts cannot be remove from it through blowing. I tried that once and scratch the screen, had to replace a new one at the service centre. If the dirts annoy you badly and does not drop off from the screen after repeated blowing with a blower, just bring in to the service centre and ask them to clean it for you.
    That's what i'll do in future....
    Canon EOS 5D, 24-70 f/4 L IS, 50 f/1.2 L, 70-300 f/4-5.6 L IS, 600EX-RT. Sigma 12-24 f/4.5-5.6 EX.

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    Default Re: do film SLRs have sensors of which must be cleaned periodically?

    That's right. Having scratches on the focussing screen is a lot worst than having dust on it. Because when you look through the viewfinder of you will see dark translucent lines! Very distracting. So be very careful with the focussing screen, it scratches so easily.

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    Default Re: do film SLRs have sensors of which must be cleaned periodically?

    Luckily mine's only dirty and not scratched.
    Canon EOS 5D, 24-70 f/4 L IS, 50 f/1.2 L, 70-300 f/4-5.6 L IS, 600EX-RT. Sigma 12-24 f/4.5-5.6 EX.

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