Hi All
Does anyone want any cheap microscope objectives...
Edmund Optics are having a clearance sale...
http://www.edmundoptics.com/onlinecatal ... 1#products
I've snagged myself some of the 30x that i've been trying to get hold of for so long, I never thought i'd get them this cheap
Lots of other goodies in their sale so it's worth a good look around and not just the page i've linked to above.
Cheers
Jem
Cheap Microscope Objectives
Forum rules
Finding new homes for holography-related items is encouraged. Even commercial enterprises with goods to offer are welcome as long as it is in the spirit of members helping members. If a for-sale post reads like an infomercial, though, you have probably crossed the line of acceptability.
Finding new homes for holography-related items is encouraged. Even commercial enterprises with goods to offer are welcome as long as it is in the spirit of members helping members. If a for-sale post reads like an infomercial, though, you have probably crossed the line of acceptability.
Cheap Microscope Objectives
Hey Jem, thanks for the link! I, too, picked up a few of the 30X objectives. They should be perfect for my holography table and have proven to be hard to find. Much thanks!! Ron
Cheap Microscope Objectives
i grabbed a few as well, they arrived and the are all some weird thread size, Edmund admitted thier mistake in the description and refunded my $$$
Cheap Microscope Objectives
Yep, unfortantely these have a small (~14mm) thread instead of the more usual 20mm thread. However, it's very easy to make an adapter if you have any old standard thread objectives laying around that have got scratched etc and are useless ( I had a few ). Oh, did I mention you need a lathe as well?
Anyway, you just cut up the old objective (about 5mm from the thread shoulder), turn the edge flat on the lathe, mill or turn a 15mm hole (at the opposite end to the thread ). You can then glue the new smaller objective in there and it works a treat .
Note: hole is a bit rough on this one as my cutting tool was blunt and was vibrating , i've now bought a 15mm end mill. Not really a problem though as it gives the glue a good key
Sorry the photo's a bit rough as it was taken at clsoe range with my phone.
Jem
Anyway, you just cut up the old objective (about 5mm from the thread shoulder), turn the edge flat on the lathe, mill or turn a 15mm hole (at the opposite end to the thread ). You can then glue the new smaller objective in there and it works a treat .
Note: hole is a bit rough on this one as my cutting tool was blunt and was vibrating , i've now bought a 15mm end mill. Not really a problem though as it gives the glue a good key
Sorry the photo's a bit rough as it was taken at clsoe range with my phone.
Jem
Cheap Microscope Objectives
My lathe isnt set up at the time but ill make mine work using a drill press, great idea Jem thanks.......
PS if you complain to them about misrepresentation (this is by no means a "standard" size), chances they will refund you $$ and allow you to keep the items! Dag-nabbit! i should have ordered more!
PS if you complain to them about misrepresentation (this is by no means a "standard" size), chances they will refund you $$ and allow you to keep the items! Dag-nabbit! i should have ordered more!
Cheap Microscope Objectives
Hello Everyone,
If you have a lathe why are you using glue? Make a threaded adaptor that just screws onto the new objective.
Jeffrey Weil
NorthBeach Holography Inc.
If you have a lathe why are you using glue? Make a threaded adaptor that just screws onto the new objective.
Jeffrey Weil
NorthBeach Holography Inc.
Cheap Microscope Objectives
Don't read this one Jeff! Use a hacksaw to cut off an old objective as above, drill it out some way, paint it black inside, and glue the new one in place. Do a neat job (file after hacking) and it'll look AND work good as store bought.
Cheap Microscope Objectives
Don't think i'd trust my lathe (or me) to do screwcuttingJeffrey Weil wrote:Hello Everyone,
If you have a lathe why are you using glue? Make a threaded adaptor that just screws onto the new objective.
Jeffrey Weil
NorthBeach Holography Inc.
Glue is much easier
Cheap Microscope Objectives
Unfortunately cheap by all means.
They are rather objectives for cheep school microscopes.
I have ordered a few 10x, 20x and 30x and just measured the transmission:
Every fourth photon cannot pass through these objectives, only about 75% of the beam is transmitted.
They are rather objectives for cheep school microscopes.
I have ordered a few 10x, 20x and 30x and just measured the transmission:
Every fourth photon cannot pass through these objectives, only about 75% of the beam is transmitted.
Cheap Microscope Objectives
I agree. They are very poor lenses, and cheap as they were, they were a mistake to buy. The optics were so poor that I could not even clean the beam up very well with my spatial filter. I used a 25 micron pinhole which was probably not the best match (20 or 15 microns might have worked better), but for a while I actually thought my pinhole might have been dirty as an explanation for why the beam looked so uneven after filtration. Careful examination of my pinhole with a microscope showed it to be just fine.