Useful links

[Bebbo89]

All very usefull, especially to a beginer like me. Thanks

[Hawk-finger]

Exactly one of the reasons I joined this Forum, great list many thanks.

[Duncan1976]

Thanks really appreciate

[Beads]

Good list but needs updated - 2 of the links that I opened are no longer available.
We have a similar problem at work, people put up spreadsheets with links to standards or specifications.
An "owner" of the spreadsheet then needs to be identified whose task is to check the spreadsheet every 6 months to ensure the correct information is available or to be the point of contact if someone wants to update the spreadsheet.

Ed

ps. And no I'm not volunteering!!

[ToniD]

Hi, some of the links no longer work. I was interested in the ones on parralax, I find it very confusing.

[angrybear]

Hi, some of the links no longer work. I was interested in the ones on parralax, I find it very confusing.

Use wiki, scroll down the page to optical sights it gives a very good explanation.
https://en.wikipedia.org/wiki/Parallax