Yes it's good isn't it? Gives me silly ideas about binoculars, SLR camera lenses and all sorts of things.jbeale wrote:That looks like a nice clear view through the microscope, thanks for posting that! At work a few years ago, somebody bought a small video camera that was designed to mount on a microscope eyepiece, and it was definitely less clear than this example.
I happened to walk past Poundland today and popped in for a look. I saw reading glasses and thought of you. Two pairs mysteriously jumped into my hand and before I knew it I was the proud owner of +2 and +3D reading glasses - enough for several Pi cameras.pluggy wrote:Find a pair (or buy a pair - they are very cheap) of +2 or stronger reading glasses, pull one of the lenses out and mount it in front of the camera lens.
Actually I have one of those already. I thought it would be much better than the cheap and nasty plastic reading glasses. The truth is, I can't tell the difference between them. I could when I viewed them at the same time[/edit] They both make things beautifully sharp close-up, at the expense of some contrast - even the "proper camera" optic.gkreidl wrote:Single front lenses with 2D for cameras are available for about 6 Euro - but they are rather large, starting at 52 mm. But may be the cheapest solution and won't degrade the image quality very much, I think. And if you build a kind of case for it, you may be able to switch between different lenses (4D and 8D also available).
(here, in German: http://www.fotolinsen24.de/nahlinsen/2- ... ptrien.php )
Yes I was thinking last night that it's really doubtful that the £1 reading glasses have any kind of anti-reflective coating.jbeale wrote:Generally speaking, the more lens surfaces you have in your optical system, the lower the contrast. You know those olde-time photos that have a sort of misty-dream quality? Part of that is low contrast due to uncoated optics. You can improve things if all your surfaces are AR-coated (anti-reflection). AR coatings are often easily scratched, and they always add cost, so cheap lenses are probably not coated.
Will they be any good at four for a tenner though? I remember paying a tenner for that 52mm one in the photo at least 15 years ago. The reading glasses are good enough for most things. The loss of contrast isn't that bad.Trav wrote:You can get them down to 37mm diameter:
http://www.amazon.co.uk/New-~37MM-Close ... oseup+37mm
Once upon a time you could get even smaller ones, like 32mm, but you would probably only find those at camera collectors' fairs nowadys.
Well you get what you pay for, but the same applies to £1 plastic spectacles. A glass close up lens should give less distortion at the edge than plastic specs, but then with the tiny raspicam lens, you're only going to be using the centre anyway, so not a problem.alexeames wrote: Will they be any good at four for a tenner though? I remember paying a tenner for that 52mm one in the photo at least 15 years ago. The reading glasses are good enough for most things. The loss of contrast isn't that bad.
Yep - I had that thought this afternoon while driving. Make a mount with the right thread on and then the "proper" 52mm slr lenses/filters I already have can be used. That's more in the spirit of Pi - use what you already have (particularly if it's already quite good quality). I have a 52mm circular polariser (and a hood) as well if we ever get any weather bright enough to use it in.Trav wrote:One advantage to the close up lens set is that you could get a threaded mounting ring glued onto your camera box (old filter or stepping ring) and change and combine the lenses to give you 1-7 or 10-17 dioptre combinations, and fit a lens hood, assuming you mount the camera in a box. Goodness knows what the quality would be like through four cheap lenses at 17 dioptre, though!
most certainly will http://www.ebay.co.uk/itm/58mm-UV-Prote ... 19db06a374alexeames wrote: Looks like it'll be cheaper to buy a crappy skylight filter and smash it for the thread than buying a step-ring.
dan3008 wrote:Pays your money, takes your choice
Hi RaspLogic, thanks ! And I'd like to second the comment posted over on your youtube video: "where DID you get that $1 lens ?"RaspLogic wrote:Here is my 1 usd solution to get a perfect DIY near focus camera.