Elphel 333 (practical thread)

Hurcan Emre · February 13th, 2007, 02:52 AM

im in the university for 3 days. And only able to look for it in the universitie's chemical labaratuary. i found parafain wax here but no microwax. i will go to the city today and look for microwax in hobbyshops. there is a very little chance but i will give it a shot :)

or there is a posibbelety that if i can find the formula for the micro wax, i can produce it in the universtylab with the help of product engineers here. however i don't want to wait that long.

Hurcan Emre · February 14th, 2007, 03:43 PM

i searched everywhere but couln't find macrowax. I only found parafin. maybe i should melt parafin between two transparant cds and use it as a turning ground glass.

what do you think? would it be much metter than the one that is done with the sand paper?

ps: should i open a new thread or continue this one? (probably this should be the last post from me that is not about Elphel 333 :) )

Oscar Spierenburg · February 14th, 2007, 05:28 PM

Here is the old microwax thread http://www.dvinfo.net/conf/showthrea...light=microwax
Maybe we'd better post everything about wax over there.
The Elphel has given it a new dimension though, because it turns out to be the best static 35mm solution for HD footage.

Matteo Pozzi · February 16th, 2007, 07:30 AM

Hi oscar I've to ask you only one thing about the microwax gg ....I haven't understand if, at the end, I'll have to remove the small glass with the aluminum foil and looking at microwax on the net I've found this http://www.highlandwoodworking.com/i...OD&ProdID=1304
have you tried it ...di you think is a good choice!?

Oscar Spierenburg · February 16th, 2007, 11:52 AM

Matteo,

Don't remove the small glass, and don't remove the foil. You just have to clean both sides of the pieces of glass.
I never used the microwax-polish. Maybe it works, but I think it will be too fluid, which makes it too transparent (I tested beeswax-polish).
You need something like this: http://www.genwax.com/do_not_index/Z40M75W.htm (I still had that in my bookmarks)

Oscar Spierenburg · February 28th, 2007, 12:18 PM

How would a lens like this do on an Elphel 333 camera.
I guess it's from an old professional video camera like this one, and the lens should be adapted to c-mount somehow.
The elphel sensor size is "slightly bigger than 1/2" format (nominal 6.4mm x4.8mm)" , but for the 16:9 at 24fps we don't use the whole sensor. What's the chip size of such a panasonic? I'm asking because I'd like to have a good lens on the Elphel when it's not on the 35mm adapter. Also a bit wide angle, because the 35mm DOF effect is almost lost on wide angle lenses, so I wouldn't use the adapter in those cases anyway.

Matteo Pozzi · March 1st, 2007, 10:44 AM

Oscar pay attention to the fact that what was "broadcast" quality
was with a resolution of 640 x 480 (more or less for pal) so I think that you have to invest in some "megapixel" c mount lens to achieve the result of the image of Phil

Oscar Spierenburg · March 1st, 2007, 02:17 PM

Yes, but I guess a professional camera comes with a very sharp lens, and because resolution is something very subjective when it comes to optics (like.. what's the resolution of a real 35mm picture)

Matteo Pozzi · March 2nd, 2007, 09:04 AM

maybe you can give it a try it is not so expansive :-) I was thinking for a megapixel lens... if we can adapt a 5 mp camera lens ...you can take an old
broken digital camera for cheap and dismouting it mabe can be usefull

Oscar Spierenburg · April 6th, 2007, 09:59 AM

I have now bought a big lens (bigger than the Elphel itself! - didn't know until I got it) originally for a professional Panasonic video camera. I made a mount for the tripod and the elphel so it's in balance (see the images)
I have to fine adjust the focal point, but I got some very sharp images already. And very good at low light.

Another very practical thing I made is a separate optical viewfinder next to the camera. I striped a SLR camera to a small directors-finder. I can also use it with the 35mm adapter. Whatever lens I put in front of the Elphel, I just zoom in with the viewfinder to match the field of view.
Of course I can't pull focus this way, but that's the next problem to solve. (synched follow focus?)

Here are some pictures:

Oscar Spierenburg · April 12th, 2007, 06:19 AM

I guess the image is deleted from the server. Here it is again:

http://img183.imageshack.us/img183/6...wfinderhj4.jpg

Daniel Lipats · April 12th, 2007, 08:07 PM

Hey Oscar,

Please upload some more pictures, I would really like to see how sharp the lens is. Can you provide any details on it?

This is what im working on right now:
http://www.buysmartpc.com/333/333design.jpg

I have most of it built.. and when complete i don't think it will weigh much more then a steadycam with a monitor, battery pack and counter weights. I can also balance everything to behave as a stabilizer

February 13th, 2007, 02:52 AM	#31
Hurcan Emre Regular Crew Join Date: Dec 2005 Posts: 32	im in the university for 3 days. And only able to look for it in the universitie's chemical labaratuary. i found parafain wax here but no microwax. i will go to the city today and look for microwax in hobbyshops. there is a very little chance but i will give it a shot :) or there is a posibbelety that if i can find the formula for the micro wax, i can produce it in the universtylab with the help of product engineers here. however i don't want to wait that long.

February 14th, 2007, 03:43 PM	#32
Hurcan Emre Regular Crew Join Date: Dec 2005 Posts: 32	i searched everywhere but couln't find macrowax. I only found parafin. maybe i should melt parafin between two transparant cds and use it as a turning ground glass. what do you think? would it be much metter than the one that is done with the sand paper? ps: should i open a new thread or continue this one? (probably this should be the last post from me that is not about Elphel 333 :) )

February 14th, 2007, 05:28 PM	#33
Oscar Spierenburg Major Player Join Date: Jan 2005 Location: (The Netherlands - Belgium) Posts: 735	Here is the old microwax thread http://www.dvinfo.net/conf/showthrea...light=microwax Maybe we'd better post everything about wax over there. The Elphel has given it a new dimension though, because it turns out to be the best static 35mm solution for HD footage.

February 16th, 2007, 07:30 AM	#34
Matteo Pozzi Regular Crew Join Date: Jul 2005 Location: Milan, Italy Posts: 169	Hi oscar I've to ask you only one thing about the microwax gg ....I haven't understand if, at the end, I'll have to remove the small glass with the aluminum foil and looking at microwax on the net I've found this http://www.highlandwoodworking.com/i...OD&ProdID=1304 have you tried it ...di you think is a good choice!?

February 16th, 2007, 11:52 AM	#35
Oscar Spierenburg Major Player Join Date: Jan 2005 Location: (The Netherlands - Belgium) Posts: 735	Matteo, Don't remove the small glass, and don't remove the foil. You just have to clean both sides of the pieces of glass. I never used the microwax-polish. Maybe it works, but I think it will be too fluid, which makes it too transparent (I tested beeswax-polish). You need something like this: http://www.genwax.com/do_not_index/Z40M75W.htm (I still had that in my bookmarks)

February 28th, 2007, 12:18 PM	#36
Oscar Spierenburg Major Player Join Date: Jan 2005 Location: (The Netherlands - Belgium) Posts: 735	How would a lens like this do on an Elphel 333 camera. I guess it's from an old professional video camera like this one, and the lens should be adapted to c-mount somehow. The elphel sensor size is "slightly bigger than 1/2" format (nominal 6.4mm x4.8mm)" , but for the 16:9 at 24fps we don't use the whole sensor. What's the chip size of such a panasonic? I'm asking because I'd like to have a good lens on the Elphel when it's not on the 35mm adapter. Also a bit wide angle, because the 35mm DOF effect is almost lost on wide angle lenses, so I wouldn't use the adapter in those cases anyway.

March 1st, 2007, 10:44 AM	#37
Matteo Pozzi Regular Crew Join Date: Jul 2005 Location: Milan, Italy Posts: 169	Oscar pay attention to the fact that what was "broadcast" quality was with a resolution of 640 x 480 (more or less for pal) so I think that you have to invest in some "megapixel" c mount lens to achieve the result of the image of Phil

March 1st, 2007, 02:17 PM	#38
Oscar Spierenburg Major Player Join Date: Jan 2005 Location: (The Netherlands - Belgium) Posts: 735	Yes, but I guess a professional camera comes with a very sharp lens, and because resolution is something very subjective when it comes to optics (like.. what's the resolution of a real 35mm picture)

March 2nd, 2007, 09:04 AM	#39
Matteo Pozzi Regular Crew Join Date: Jul 2005 Location: Milan, Italy Posts: 169	maybe you can give it a try it is not so expansive :-) I was thinking for a megapixel lens... if we can adapt a 5 mp camera lens ...you can take an old broken digital camera for cheap and dismouting it mabe can be usefull

April 6th, 2007, 09:59 AM	#40
Oscar Spierenburg Major Player Join Date: Jan 2005 Location: (The Netherlands - Belgium) Posts: 735	I have now bought a big lens (bigger than the Elphel itself! - didn't know until I got it) originally for a professional Panasonic video camera. I made a mount for the tripod and the elphel so it's in balance (see the images) I have to fine adjust the focal point, but I got some very sharp images already. And very good at low light. Another very practical thing I made is a separate optical viewfinder next to the camera. I striped a SLR camera to a small directors-finder. I can also use it with the 35mm adapter. Whatever lens I put in front of the Elphel, I just zoom in with the viewfinder to match the field of view. Of course I can't pull focus this way, but that's the next problem to solve. (synched follow focus?) Here are some pictures:

April 12th, 2007, 06:19 AM	#41
Oscar Spierenburg Major Player Join Date: Jan 2005 Location: (The Netherlands - Belgium) Posts: 735	I guess the image is deleted from the server. Here it is again: http://img183.imageshack.us/img183/6...wfinderhj4.jpg

April 12th, 2007, 08:07 PM	#42
Daniel Lipats Major Player Join Date: Feb 2006 Posts: 260	Hey Oscar, Please upload some more pictures, I would really like to see how sharp the lens is. Can you provide any details on it? This is what im working on right now: http://www.buysmartpc.com/333/333design.jpg I have most of it built.. and when complete i don't think it will weigh much more then a steadycam with a monitor, battery pack and counter weights. I can also balance everything to behave as a stabilizer