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Old 16-10-2018, 05:23 PM
chardie (Leslie)
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small flat glass needed

hello all i'm trying to source some flat glass. the actual dimensions are 12mm*11mm*2.5mm. but i would be ok getting a bigger piece and cutting it down. some time ago i pulled the hot mirror or inferred filter out of my nikon 950 and replaced it with a piece of glass 2mm thick while that worked. it worked best at the near focus or close up, anything further away than 50 cm is out of focus. i'd now like to get a piece of glass the proper thickness and go back to shooting landscapes and other things. i have tried obrians and the local glass company however they don't have anything that thin . so i thought i might try you guys perhaps you have some idea that may help me out, thanks in advance
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Old 16-10-2018, 05:58 PM
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ZeroID (Brent)
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I'll check my cannibalised box tomorrow for thin glass. I have a collection from various instruments that have died and been stripped.
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Old 16-10-2018, 08:18 PM
Wavytone (Nick)
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So... what happened to the piece you removed in the first place ? And are you sure of the exact dimensions ? Near enough isn’t good enough.

2.5mm is sometimes used in smallish picture frames up to 10 x 8” but you will have to cut a piece then grind the edges down to the exact size you want using a carbide stone and water, or grit and a glass tool.

Last edited by Wavytone; 16-10-2018 at 08:39 PM.
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Old 16-10-2018, 09:36 PM
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Regarding replacing the glass - The Glass thickness as well as its refractive index need to be the same to emulate the original. That's not to say that you couldn't make something different work, just that it might take some experimentation.

Best
JA
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Old 17-10-2018, 11:05 AM
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Would microscope slides work?

No clue, just thinking outside the box here.
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Old 17-10-2018, 11:49 AM
Wavytone (Nick)
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Lewis that was my first thought but they’re too thin at 1mm.

The exact thickness and refractive index are crucial - to within a few microns. Get that wrong and it will never be the same again.

He suggested 2.5 mm but I wonder how that was determined. The glass in small picture frames is about the only easy source approximating that.

Then there’s the challenge of cutting a piece to the required size without scratches - any scratch will show on every image taken through it, since it’s hard up close to the sensor.

TBH the only real solution is a new camera.
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Old 17-10-2018, 01:14 PM
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silv (Annette)
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Quote:
TBH the only real solution is a new camera.
That'd be boring!
It's not the only real solution, either. There's another one, boring as well, since it's not DIY but US$170 to get the ful spectrum conversion done on his old Nikon 950: https://kolarivision.com/product/nik...rsion-service/
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Old 17-10-2018, 07:05 PM
Wavytone (Nick)
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Well another option is to find another dead camera and cannibalise that.
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Old 17-10-2018, 10:56 PM
chardie (Leslie)
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i have the original somewhere here on my bench and a set of digital calipers plus several sources on the internet give the size as well. 2mm is too thin and works only as close up. it sits in a rubber cradle you might say and is a little big, so height and with aren't so much the issue. its as thickness. indeed when i first found a piece of glass to experiment with it took several attempts to get it right i expect the same when i find a piece of glass the correct thickness. the nikon 950 no longer serves as my primary camera and its well out of warranty. it has good sensitivity to inferred which is why i have pulled the hot mirror out and wish to replace it with clear glass. i would consider two pieces of 1.25 thick glass and sandwiching the inferred filter film between them but that would make the camera full time inferred and i kinda like the option of using it with out the filter at times.
with and without a filter
http://i.imgur.com/7Ov1aXL.jpg
http://i.imgur.com/m66FmGL.jpg
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Old 18-10-2018, 03:12 AM
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very cool. Hope you'll find 2.5mm!
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Old 18-10-2018, 06:56 AM
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Edmund scientific?
I know they sell some interesting stuff.
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Old 22-10-2018, 07:13 PM
chardie (Leslie)
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i have emailed edmund scientific. hopefully hear back in a couple of days
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Old 01-11-2018, 10:06 PM
chardie (Leslie)
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no joy from edmund still looking
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Old 02-11-2018, 03:30 AM
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if you're okay with sandwiching 2 glass pieces maybe you get lucky using the 2mm plus a cut piece from a normal lens protective screw-on filter? Pure glass or UV would be also a possibility. They're cheap so wouldn't hurt if it doesn't work. These are the ones I was thinking of https://www.ebay.de/itm/62mm-UV-Filt...v/401095171817
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Old 02-11-2018, 03:56 AM
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here's 2.5mm thickness for 58? https://www.knightoptical.com/stock/...mmdiax25mmthk/
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Old 02-11-2018, 08:22 AM
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https://www.teleskop-express.de/shop...D-40D-50D.html

May be a solution??
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Old 03-11-2018, 09:08 AM
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Came across a few on eBay - various sizes and thicknesses
https://www.ebay.com/sch/i.html?_fro...ilter&_sacat=0
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Old 14-11-2018, 02:14 PM
chardie (Leslie)
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well i ummed and arred a bit. i lashed out on a watch glass face, 2.5 mm x 44 mm so hopefully get a couple of bites at the cherry so to speak. got some tiny diamond cutting blades for the dremel. i figure i'll mask it up with masking tape and have at it with the dremel i'll let you know how i get on. i guess some safety glasses are mandatory
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Old 21-01-2019, 10:15 PM
chardie (Leslie)
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well the glass turned up several weeks ago. 2.5 mm as requested my issue was i had put the diamond coated disks for the dremel in a safe place. its taken awhile to find them. hopefully can have a go in cutting the glass in the next couple of days. wish me luck
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Old 22-01-2019, 12:39 AM
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Ukastronomer (Jeremy)
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Quote:
Originally Posted by LewisM View Post
Would microscope slides work?

No clue, just thinking outside the box here.
I was thinking that or 35mm SLIDE film carriers,

https://www.speedgraphic.co.uk/mount...waAn4WEALw_wcB
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