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diaphragm

In optics, a diaphragm is a thin opaque structure with an opening (aperture) at its center. The role of the diaphragm is to stop the passage of light, except for the light passing through the aperture. Thus it is also called a stop (an aperture stop, if it limits the brightness of light reaching the focal plane, or a field stop or flare stop for other uses of diaphragms in lenses). The diaphragm is placed in the light path of a lens or objective, and the size of the aperture regulates the amount of light that passes through the lens. The centre of the diaphragm's aperture coincides with the optical axis of the lens system.
Most modern cameras use a type of adjustable diaphragm known as an iris diaphragm, and often referred to simply as an iris.
See the articles on aperture and f-number for the photographic effect and system of quantification of varying the opening in the diaphragm.

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  1. R

    What type of diaphragm?

    Can anyone tell me what type of diaphragm this is and where I could get one please? The cistern was taking ages to fill up. I have tried Plumbers merchants and screwfix but they didnt have the same type. Also, on my other toilet, that was taking forever to fill up aswell so I removed the...
  2. R

    Siamp diaphragm washer relacement- strange behaviour!

    Dear All, My cistern started making 'spraying' noises and became slow to fill when flushed. Looked at the diaphragm washer and noticed a split. Bought a new washer and replaced old one. With the new washer, the water flows just fine but the flow won't shut off. Put the old (split) washer back...
    • RichardA
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    • Forum: USA
  3. T

    My double flush toilet has developed a fault. It won't stop filling eve when I pull the float arm right up. I have replaced the inlet valve diaphragm

    My double flush toilet has developed a fault. It won't stop filling eve when I pull the float arm right up. I have replaced the inlet valve diaphragm but this has made no difference What else can i try?
    • toyfish
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    • Forum: USA
  4. P

    Replacing ch diaphragm on Baxi 105E

    Hi I have just bought the kit to replace the CH diaphragm as the pin is not going all the way back. When I look to get in to do it there is no space to get spanner’s, screwdrivers in etc. It is all blocked by the DHW diverter, pipes and wires. Any advise on how best to get access? many thanks Paul
    • paul_cragg
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    • Forum: USA
  5. B

    Anyone know which diaphragm is in a Roca inlet valve?

    Is it torbeck, fluid master, regular ball valve or its own special one? I’m talking about that one in the lauras which has an oval float in a shroud.
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  6. M

    Toilet Siphon diaphragm replacement?

    Hi guys. One of the in-laws has an issue with her toilet not flushing. I’ve had a very quick look and it seems the plastic diaphragm has split in the siphon. It’s an older siphon but luckily it does split in to 2 so I don’t have to replace the whole thing, but that’s only if one of you good...
    • macka09
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  7. M

    Vaillant VCW 240 GB HY Diaphragm pump

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  8. T

    help to identify Diaphragm

    hi I have a concealed system that needs a replacement inlet diaphragm replacing. I am having trouble identifying what make it is and where to find a replacement. I dont want to have to rip the whole thing out and replace the cistern if possible pictures attached any help greatly appreciated...
  9. M

    Vokera maxin 24e no hot water flow switch/sensor or diaphragm

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  10. S

    How to adjust Honeywell V5012 diaphragm

    I live in an apartment with communally heating supply which is fed into a heat exchange unit in my apartment which uses the communal feed to heat hot water for taps and underfloor heating. I have one of these v5012 things fitted which I believe regulates flow between input heated communal feed...
  11. moonlight

    Do you recognise this diaphragm?

    I was given 10 of these from a retired plumber. He couldn't remember which boiler they had come from. Hopefully someone will recognise them.
  12. P

    Boiler help!!!

    Hi guys ,my son has a brittony 100 se combi boiler, and when you turn on hot water tap the boiler doesn,t fire every time, perhaps one in ten attempts . We get hot water through eventually if heating is on as well, The flow switch plunger was not reaching the micro switch to fire...
  13. B

    Armitage Shanks Diaphragm Washer

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  14. R

    How do I change diaphragm washer

    I think I need to change the diaphragm washer on my toilet cistern. Water keeps pouring into the toilet even after flushing has stopped. It's an Ideal standard, about 6 years old. Someone did show me the last time I needed to do this, but I've forgotten. Then the old washer had developed a hole...
  15. W

    trouble flushing toilet

    Went to a friends house as they couldn't flush the toilet as you had to pump the lever handle. I changed the diaphragm over and put all back together but it's still not flushing. Is it the case of just getting and fitting a new one
  16. D

    Unvented boiler replace diaphragm Leicester

    Hi im looking for a G3 registered plumber to replace a diaphragm in the white expansion vessel There's a thread about the problem which includes pics & video but I can't post the link to it for some reason :confused5: PM me for details
  17. R

    fill valve replacement

    anyone know the make of this fill valve please. all boxed and tiled in you know what its like! replacement best option:yesnod:
  18. M

    repeated pressure loss / leaking valve diaphragm

    Hi All. Firstly my apologies if this is a trade only forum. I'm not in the trade, just your average 'customer'. The 'Customers!' thread in here made me laugh. Promise I'm not one of them :) I have had a few different plumbers round who can't seem to fix the issue i have. I have a Remeha...
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  19. C

    Very slow fill of cistern

    The fill on my toilet is very slow, I have found that If I take the lid off the cistern and lift the shut-off arm? and release a couple of times and release I can make it flow faster. There is also water escaping from the top of the fill valve assembly, this continues after the water has...
  20. S

    My Potterton Performa 24 Giving Me Problems Again.

    Hello All Its me again with another question about my potterton combi boiler. Sitting indoors the other night sweating my n*ts off thinking bloody hell its a bit hot in here when my other half comes in and tells me the heating is on, so me being the kind considerate man that I am flip out and...
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    • again boiler central heating system diaphragm giving other potterton problems still
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