DIY Vibrating 35mm Adapter for cheap

G

gregtay67

Member
Guys, check out my DIY adapter I made including the ground glass. I tried ordering the ground glass holder from jetsetmodels website but didn't get an answer. So I designed my own. The first design was crude but worked. I refined it to the current version. Here are the samples of video I shot with this adapter. http://www.vimeo.com/1325495 I made a 20, 9 and 5 micron ground glass and tested those after i spoilt 2 canon EE-A because I touched it.

Here are pictures of the GG holder. http://www.flickr.com/photos/28499376@N03/2660598846/
You will notice that the GG holder has a socket to swap out ground glass easily without having to glue and unglue. You can also see that the design allows you to add washers to adjust the backfocus should you add lens mount adapters for different type lenses.
 
thanx, same here :bath:
except that I rather used BLACK matt plastic to avoid any reflections or light haze inside adapter
but you defintely ispired me how to made adjustabe back focus thing which bugs me some time. :thumbsup:
Also I like no gluing ground glass system
 
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Ok, I've heard about these vibrating things allover now, but still I don't know what the purpose is. Could I beg an explanation of anyone please?
 
that looks awesome! so how did you go about making the focusing screens? how much would you sell one of those 5 micron screens for?
 
Great job, the footage looks NICE. Is there any chance you to post a part list and some somple instructions on how to make our own. I am very interested in trying to build one.. Thanks
 
Hi Tom, here's a parts list from my design. You need some trial and error to put it together.

1) Canon EOS macro extension tubes 2 sets. Nikon tubes also may be used but has a smaller diameter.
http://cgi.ebay.com/3-Ring-Macro-Ex...ryZ79000QQssPageNameZWDVWQQrdZ1QQcmdZViewItem

2)an achromat doublet or a macro closeup lens to help camcorder focus on the focusing screen
http://cgi.ebay.com/72mm-1-2-4-MACR...ryZ15220QQssPageNameZWDVWQQrdZ1QQcmdZViewItem

This is ideal for achromat http://cgi.ebay.com/CINE-72mm-HD-AC...ryZ15220QQssPageNameZWDVWQQrdZ1QQcmdZViewItem

3) A 50mm diameter ~100mm focal length PCX lens

4) A vibrating motor

5) A Variable resistor 50 ohms or 100 ohms( for motor speedd adjustment)

6) battery holder for 2 AA or 2 AAA batteries

7) A focusing screen (you can do a search here or google for ddifferent options or contact me) -this is the most important component.

8) A focusing screen holder (DIY or contact me)
9) A 55mm UV filter (to be glued to end to EOS tube to give it a standard 55mm thread

10) A 52->55mm stepping ring. this is used to help glue the PCX lens into the EOS tube.

11) on/off switch for the motor

12)drill and sandpaper


here's the configuration

SLRlens->PCXlens->focusing screen->achromat or closeup filter->camcorder

Some people put the PCX lens between the achromat and the focusing screen but it produces too much chromatic abberation for me. But it does remove the vignetting better.
pics here http://www.flickr.com/photos/28499376@N03/2673316230/
 
Wow thanks for the help Greg! I think either this weekend or next i'll be researching and gathering the supplies on your list. Can't wait to get to work.
 
gregtay67 said:
2)an achromat doublet or a macro closeup lens to help camcorder focus on the focusing screen
http://cgi.ebay.com/72mm-1-2-4-MACR...ryZ15220QQssPageNameZWDVWQQrdZ1QQcmdZViewItem

This is ideal for achromat http://cgi.ebay.com/CINE-72mm-HD-AC...ryZ15220QQssPageNameZWDVWQQrdZ1QQcmdZViewItem
Click to expand...

Hey there greg, do you think the Indian achromat is pretty good? I thought that people thought it was bad. Does it work well? Have you compared it to any of the mainstream achromats like Cinevate or Redrock or SGpro? I'd like to know how it compares to those.
 
bmxbud
I used aluminium oxide to grind the glass. The painful part is actually cutting the glass and getting it to the correct dimentions.
 
Texanite,
Actually I have not tested the indian achromat but I think it should work ok. I have a SGpro achromat and it is really good. I have tested the el-cheapo 58mm +10 close up filter on my HV20 and it works really great. I think this is because the HV20 diameter size is 43mm and it's much smaller than the closeup filter. I tested the 58mm closeup filter on the sony FX1 and the DVX100 (both 72mm threads) but the quality was bad. Centre of the picture was ok but it produced very soft edges with chromatic abberations.Therefore I still think the indian achromat should work ok. Any posting of people using it on this forum?
 
Here's a test I did at a cafe for a paying job. The lighting was standard cafe lighting. Not too dark but definately not bright like an indoor shoot with lights. This was done with a 9 micron grind focusing screen. Notice the visible noise caused by the cmos sensor and the focusing screen grain. Looks more filmic to me. http://www.vimeo.com/1349372
 
There is a world of difference between an indian achromat and the sgpro achromat. I use the later and have also tried the indian one. The indian made found on ebay exhibits so much CA. This went away when i replaced it with the sgpro achromat.
 
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