Elaborated on HQ Camera gasket assembly #1554
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Adam-Langley
changed the title
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You've got the identical |
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thanks @lurch - fixed my mistaken duplication |
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ping @simon-martin-rpi for comment |
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Simon is loaded up with work at the moment. I'm not entirely convinced we need the first image, but I guess it's a minor niggle. |
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@davidplowman @helenlynn Can I have your opinions on this change? |
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Seems OK to me, though I was slightly confused where it tells you to push down on the filter so that it comes off, and then afterwards tells you about applying isopropyl alcohol as if that's a separate step (was it?). But then, I'm not a h/w engineer... To me, this feels like a good candidate for a HOW-TO video! |
Perhaps. Except I think we want to avoid extensive documentation — and support — for something that will destroy the camera if the user does it wrong. It's documented here, because people will want to do it and we should tell them how, but I don't think Raspberry Pi should be seen as supporting it. It's not something we look like we recommend users attempt. But yes, it's far more of a video thing than a text thing. For what it's worth, I think the addition of images in this pull really helps the documentation. |
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@davidplowman happy to remove the more specific points of using ISO and heat - I just did it because I thought it would reduce the risk of breaking the filter. I've only done this once, so no empirical evidence that it helped. |
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No - don't do anything on my account! I was just confused because I'm not sure how this thing works, probably others are less easily confused. Also, I fully take the point about not doing a video, I was thinking about it from the point of view of making it easier for people to do this, but I accept that may not quite be the goal here... |
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I don't have a HQ camera myself, but I've always found the "push down on the filter" phrase confusing. Is it supposed to be "push sideways", or is there a specific location where you're supposed to be "pushing down"? |
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@lurch the assumption is by that stage you have the lens module lying flat on the table. The IR filter is seated inside a recess - so you need the module oriented such that the lens would "fall" out of the recess were it not glued in. |
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Ahhh! I didn't realise the filter was attached to the lens assembly! That makes more sense now. I thought your pictures were showing the IR filter attached to the sensor itself 😆 That'll teach me for sticking my nose where it's not wanted 😉 |
| 1. Lift up the board and place it down on a very clean surface. Make sure the sensor does not touch the surface. | ||
| 1. Before completing the next step, read through all of the steps and decide whether you are willing to void your warranty. **Do not proceed** unless you are sure that you are willing to void your warranty. | ||
| 1. Turn the lens around so that it is "looking" upwards and place it on a table. Using a pen top or similar soft plastic item, push down on the filter. The glue will break and the filter will detach from the lens mount. | ||
| 1. Turn the lens around so that it is "looking" upwards and place it on a table. |
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Should this say lens mount?
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I've asked for Simon's input here too.
| 1. Turn the lens around so that it is "looking" upwards and place it on a table. | ||
| You may try some ways to weaken the adhesive, such as a little isopropyl alcohol and/or heat (~20-30 C). Using a pen top or similar soft plastic item, push down on the filter only at the very edges where the glass attaches to the aluminium - to minimise the risk of breaking the filter. The glue will break and the filter will detach from the lens mount. | ||
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| 1. Given that changing lenses will expose the sensor, at this point you could affix a clear filter (OHP plastic) to minimize the chance of dust entering the sensor cavity. |
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OHP plastic is one option, this implies its the only option.
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I've committed a tiny wording change to make clear that OHP is an example and not the only possibility.
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| The High Quality Camera contains an IR filter, which is used to reduce the camera’s sensitivity to infrared light. This ensures that outdoor photos look more natural. However, some nature photography can be enhanced with the removal of this filter; the colours of sky, plants, and water can be affected by its removal. The camera can also be used without the filter for night vision in a location that is illuminated with infrared light. | |||
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| **This procedure cannot be reversed:** the adhesive that attaches the filter will not survive being lifted and replaced, and the IR filter may crack when it is removed. Removing it will void the warranty on the product. Nevertheless, removing the filter will be desirable to some users. | |||
| **This procedure cannot be reversed:** the adhesive that attaches the filter will not survive being lifted and replaced, and while the IR filter is about 1.1mm thick, it may crack when it is removed. Removing it will void the warranty on the product. Nevertheless, removing the filter will be desirable to some users. | |||
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Given @l;urch comment about not knowing the filter is attached o the lens mount, perhaps that should be mentioned?
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Maybe - or perhaps that'll be more obvious if you actually have an HQ camera in front of you?
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I've asked Simon for his input, busy as he is, because it needs someone who has a unit in front of them to refer to.
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@JamesH65 I'm happy with this addition of detail and I'll copy-edit once we're done discussing wording. I agree with @aallan that we needn't go to the lengths of making a video to demonstrate how one can go about voiding one's warranty. I can't see the images - they 404 for me. If there's an obvious dumb thing I'm probably doing, please suggest what it might be. |
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@helenlynn You should be able to view the images at https://github.com/raspberrypi/documentation/blob/7581babe84558acb5457cd8fae12aa261bcba2eb/hardware/camera/hqcam_filter_removal.md |
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I'd encourage you to wrap this PR up in the next week or so as we're in the process of transitioning the documentation from the current Markdown-based source format to Asciidoc. At some point soon — probably around the end of June, beginning of July — we will freeze the current documentation repo. After that time contributions and PRs based on the Markdown source will not be accepted, and any PRs that are still open will be closed. See #1911 for full details. |
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Reading the thread it seems everyone is happy with the changes. I'll mark this as ready to merge ahead of #1911. Speak now or forever hold your peace… |
aallan
added
the
ready to merge
Described the gasket assembly, added some images, detailed how to protect from dust ingress.