35mm Adapter Static Aldu35
 

Since this is a Agus proposition I go for it.

can you tell us how you measured the proper position (distance) for GG?
how many times you cutted the pipe :)

filip

Still
 

Frank


Here 2 stills


http://www.kheops-tech.com/~ad3d/still1.jpg

http://www.kheops-tech.com/~ad3d/still2.jpg

no I don't have test chart

Dmitri Henry
 

-------Wow alain static sure is the way to go. Couple things in this picture http://www.kheops-tech.com/~ad3d/IMG_2110.jpg
it looks like your uv filter is connected to some other irregular shaped box can you tell us what that is?-------

I used the lens of a optex magnifier ( 7X Oversized Magnifier,there is 3 or 4 size available.)
and this is the part on top that I remove to get acces to the lens itself.
The other thing is there is no uv filter there ,I just keep the ring to screw to the camera


-----------Also in this photo http://www.kheops-tech.com/~ad3d/parts2.jpg what is the piece you are holding at the bottom left? Last thing i heard a lot of people use fresnel lenses to concentrate the incoming light on the gg do you use that too?-----------


this is the same piece but top view so we can see the magnifier lens.

UV filters with retaining ring
 

mine is cemented in grrrrr.

anyone out there have a brand name or two to recommend with a retaining ring?

hmmm... what are you using for GG?

and hows the grain? its a little hard to tell just from stills...
if you've got the bandwidth maybe you can post a clip or two

woops... sorry... shoulda read in the agus thread first...

footage
 

Here is the device whit more detail

http://www.moorefilms.com/aldu35.htm

Very understandable now Alain so you glued the blank filter to the 7x "macro" which magnifies onto the GG which in this case is another uv filter grinded down from there you found the focal point and figured where to put the slr. Correct me if i am wrong. I am working on the same sort of static adapter only i am going to use the GG from an old zenit, thanks to Daniel for his tests. The hardest part is getting it out of this tank!

Dmitri Henry
 

That's it

aldu 35 parts issue
 

Dear Alain,
great work and a big step for poorman's 35 system
correct me if i am wrong,
1/the 7X magnifer is actually for your VX2000 as close up lens, if a camera is capable of marco is not necessary.

2/static GG is good and 7hr to make is worth it, but any other alternative ?

3/ what is the size u actually capture on the GG? say mini35 captured only 16x22mm.

4/ u may say i m insane! anyone try to mount a condom as GG?thin and smooth!!!


cheers
K.M. LO

>>>1/the 7X magnifer is actually for your VX2000 as close up lens, if a camera is capable of marco is not necessary . . .

I believe you still need it even if your camera has macro. This was a question way back on page 9 of the Agus thread when someone with a GL2 asked the same thing.

>>>2/static GG is good and 7hr to make is worth it, but any other alternative ? . . .

Good question. Most of the "How to grind your own glass" tutorials on the web say that you can get a quality ground glass in 15-20 minutes. Does it really take 7 hours????

>>>3/ what is the size u actually capture on the GG? say mini35 captured only 16x22mm.

I don't know the answer to this question, but a Century Optics rep over at dvxuser.net said you would want to match a size comparable to still frame 35mm, meaning you would want to use a still 35mm lens, not a movie lens which is actually smaller than still. This is due to getting a shallower dof with still on our small ccd cameras and it's much cheaper. . Any thoughts on this?

I like the condom idea. Someone should test this out.

What kind and size of alluminiun oxide did you use >? so you started from smaller to higher values, what is the process ? the one that you put one glass over another ?

K.M. Lo
 

I say 5 to 7 hour , but it take me four hour's whit a couple of brake because I am not patient, I prefer to take a longer brake after.
it depend .

The very first thing that I try is a roscolux diffuse filter and it's pretty interessting but you can see the grain.


Todd

The first step take me about 30 minutes, 1hrs and a half hour for the 2nd grade and at this point I have the same quality of a Chinon slide projector and it's not enought.Then something happen , probably a small piece of broken glass go thrue my two glass
and make a beautiful scracth so I have to get back to step one again, then two and three.

And the third step is the longuest one,the oxyde loook like flour.

I have read that some have try whit other kind of GG and doesn't have good result so obviously 4 to 5 hour's was what guive me this. So if there is better way please tell me.

Agus Casse
 

120
300
500 ,the bigger the number the smaller the grain,the smaller one are like flour. The goal is to have a gain that is smaller than the ccd can see.

Server
 

I have to remove the footage from the server otherwise it's gone a blow out.

I try to find another way.

Hi,

firstly, like the Agus thread, this is all very exciting. I realise I'm coming in late here but one question; when the image hits the 'GG' or focal plane, is it still backwards and upside down ala the Agus35 or does the second lens re-orient the image so that the video camera photographs the scene correctly?

Thanks, and great work.

best,

DW

Alain: Thanks for posting those uncompressed frames! I am about to place an order for the aluminum oxide, as I really want to make one of these. Thanks!

I found 600 grit Al. Oxide here:

http://www.tedpella.com/material_html/grind.htm

1 pound for $13.00.

Also, here's the article where the timing is way off from Alain:

http://www.phototechmag.com/previous...kas/dokas.html

Perhaps we are looking for a different outcome? I'm sure it's as hard for others as it is for me to determine the 'look' of the finished glass. Does anyone know what ground glass is typically used for? Sorry, I'm new at this. Thanks!

Todd: Thanks! I'm checking that out page out now.

Todd
 

From the article
----------You can spend 10 minutes to make a ground glass similar to what you could purchase by using silicon carbide, or you can invest a bit more time using aluminum oxide and have a ground glass that has more desirable qualities. And, in a real emergency, you can create a substitute that will work until you replace your broken ground glass.------


This is to make a standard GG,what we need here is very much more smooter surface and that's it take's time.
Effectively I can get a gg it 15 min but it's far from what we need.

Alain

David
 

No still reverse,I am working on someting to reverse the image but on the viewfinder only, still have to reverse in post, but that's nothing.

Alain

before we get too far into asking tons of questions I'd like to, on behalf of everyone here, thank Alain for his hard work and efforts in answering all our questions.

Considering I'm using an XL1S certain elements of this need to be adapted but it's pretty damn exciting results and yes, having to flip the footage in post (and turning my on-set monitor upside down) isn't a big deal. Although I am wondering what my DP's reaction to this might be.

I second that Kevin. I have to say, in the almost ten years of gleaning information of various topics off newsgroups and bulletin boards from the web, the work done by this group on these converters does not have an equal. The work done by Agus, Alain and all others in a few short months is staggering.

I do think it would be important to come up with a step by step tutorial with pictures to build Alain's device. Over the next week or so, I'll put together a nice little article for it and post it to my website. But since I don't have my Aluminum Oxide yet, I won't be able to supply pictures. If someone is building one right now and wants to take pictures of it as they build, that would help a lot.

Kevin Burnfield
 

There is a easy way to rotate the image ,but it need's more element (expensive one)and it result im more lost of light.

Alain

Re: Kevin Burnfield
 

<<<-- Originally posted by Alain Dumais : There is a easy way to ratate the image ,but it need's more element (expensive one)and it result im more lost of light.
-->>>

I take you mean 'rotate' but I agree with you that it would cause a loss of light hitting the CCDs and that kind of defeats the purpose.... plus the expense and added technical knowhow which I doubt I possess.

I think there might be a way to play around with the eye-piece display and if not just pull it out (CAREFULLY!) and turn it upside down....

http://www.knightoptical.co.uk/acata...sdiffusers.htm

Any of these OK to use for the ground glass?

Stewart
 

Hard to say whitout having it in my hand .But all the surch I did here whit commercial GG haven't guive me what I am looking for.
Very very very smooth grain.

After all maybe I could start a doing GG my self .but it's gone a be
around $200. each

It's really easy to do, it's just a mather of patience.

Alain

Alain would you suggest using the 120 and 300 grades before using the 500 or do you think we could get away with using just the 500 for a few hours until we get the desired results.

The main reason I ask is because I've had problems finding any telescope shops here that carry aluminum oxide, and most of the stuff I've found online are like 600.

Thanks

Exactly how does one make the UV filter into a piece of ground glass? What tools are needed and what is the step by step process? The timing used for each grit, et cetera?

Can someone make a list of all these things and where online one might purchase this equipment for the best price?

Don Mahr
 

No, I don't think so . If you try that way, it's gone a take much more time,but what I can suggest is to use a exinting gg and refine it whit the 500 .

Alain

tagged

Hey Alain, you have mentioned that it is possible to sand/grind the already existing gg. You think it is a possibility to sand down a gg (using aluminum oxide) such as the one from an old zenit slr camera? I think the gg that is from a slr camera is adopted to a fresnel lense so i am not sure if it is possible to sand it down anymore. Your thoughts?

Also did anyone here have to deal with taking out the gg from an old zenit (philip?). I am having little trouble getting this thing out of this piece of heavy machinery.

UV Filter to Make GG
 

Has anyone found the brand of GG that Alain has taken apart to make his GG?

I have a DVX100 and it is 72mm.

Thanx Agus and Alain for all the info.

Alain ALDU35 Videos
 

If you want to I can host your videos off of my site. Send me a email.

taylor@moorefilms.com

Taylor Moore
 

I have use a cokinlight 58 mm Skylight but watch out some cokin
are removable and some are not. Probably the older one are better for this.

ALain

Taylor Moore
 

Ok.
I just look at the spec of your camera and understand that it's not your lens but the filter diameter.

So is it more difficult to find some filter of this size?

Alain

Grind
 

It is quiet here tonight, are everybody grinding? :-)


Alain

Alain: Just ordered my aluminum oxide today. I'm very eager to get started.

Anyone else out there making or planning to make one of these for a Canon GL2?

,Frank