JML 21mm f/3.5 Lens---Mounting Techniques
Moderators: rjlittlefield, ChrisR, Chris S., Pau
- Craig Gerard
- Posts: 2877
- Joined: Sat May 01, 2010 1:51 am
- Location: Australia
- Craig Gerard
- Posts: 2877
- Joined: Sat May 01, 2010 1:51 am
- Location: Australia
Ray,
Contact them and ask re- shipping to Australia.
Their website is automated; but human intervention on their part should bring the shipping cost down considerably; but this may initially require an enquiry on your part.
Craig
Contact them and ask re- shipping to Australia.
Their website is automated; but human intervention on their part should bring the shipping cost down considerably; but this may initially require an enquiry on your part.
Craig
To use a classic quote from 'Antz' - "I almost know exactly what I'm doing!"
- Craig Gerard
- Posts: 2877
- Joined: Sat May 01, 2010 1:51 am
- Location: Australia
A few days ago when I ordered mine I was told that they have 30 left. So I wonder where those have gone to...
Klaus
http://www.macrolenses.de for macro and special lens info
http://www.pbase.com/kds315/uv_photos for UV Images and lens/filter info
http://photographyoftheinvisibleworld.blogspot.com/ my UV diary
http://www.macrolenses.de for macro and special lens info
http://www.pbase.com/kds315/uv_photos for UV Images and lens/filter info
http://photographyoftheinvisibleworld.blogspot.com/ my UV diary
I took advantage of the flange by mounting the lens with two nitrile rubber O-rings (ID=15/16", OD=1 1/8", Thickness=3/32") in a 39mm body cap in which I had cut the appropriately sized hole. The body cap fits on my 39mm extension tubes. The O-rings secure the lens firmly, but still allow quick and easy interchangeability if I wish to compare the performance of different copies of this lens.
David
- Craig Gerard
- Posts: 2877
- Joined: Sat May 01, 2010 1:51 am
- Location: Australia
Hello Craig,Craig Gerard wrote:David,
That's an interesting method. I measure the flange at 8/32". So, you could do this with any type of close-fitting (JML barrel diameter) step ring or adapter....No wobble?
Craig
No wobble at all, due to the compression from the rubber rings. I also tried a larger set of rings (ID=1", OD=1 1/4", Thickness=1/8"). They didn't sit as well in the recessed flange because of the thickness of the 39mm body cap, but would probably work well with a thinner intermediate adapter or step ring.
David
One more successful mounting:
OM mount to 49mm reversal ring
49mm to 46mm step-up ring
30.5mm to 46mm step-up ring
JML lens with 2-3 layers of tape around it
This allows it to be mounted directly to the front of an OM bellows. Press-fitting the lens into place seems to work well (thanks Bob).
The setup can also be mounted directly to the front of my camera (Olympus E-300) with only the addition of a 4/3-OM adapter. This gives a somewhat lower magnification, but leaves only a few mm of clearance for the mirror and I don't have a good method of focusing.
Magnification with this setup was calculated from these mm scale images (uncropped):
Mounted directly to camera: 1.7x
Minimum bellows extension: 3.5x
Maximum bellows extension: 11.5x
OM mount to 49mm reversal ring
49mm to 46mm step-up ring
30.5mm to 46mm step-up ring
JML lens with 2-3 layers of tape around it
This allows it to be mounted directly to the front of an OM bellows. Press-fitting the lens into place seems to work well (thanks Bob).
The setup can also be mounted directly to the front of my camera (Olympus E-300) with only the addition of a 4/3-OM adapter. This gives a somewhat lower magnification, but leaves only a few mm of clearance for the mirror and I don't have a good method of focusing.
Magnification with this setup was calculated from these mm scale images (uncropped):
Mounted directly to camera: 1.7x
Minimum bellows extension: 3.5x
Maximum bellows extension: 11.5x
As promised, here how I have it mounted it. Design has been done in collaboration with a good friend in Holland who also had that professionally made. It is a holder with three set screws which grip onto that groove on the lens, holding it very tightly. The rear mount is M42x1.0 so fits about anything. The helicoid is a double extra long helicoid I had custom made for some Nikon friends with rear Nikon mount, front M42 mount and that extends to about 90mm. That solution is very sturdy and can also be used in the field, but I guess not many will do stacking outside. [It took a bit longer to get it done this way, that must be the German in me and the engineer ]
Klaus
http://www.macrolenses.de for macro and special lens info
http://www.pbase.com/kds315/uv_photos for UV Images and lens/filter info
http://photographyoftheinvisibleworld.blogspot.com/ my UV diary
http://www.macrolenses.de for macro and special lens info
http://www.pbase.com/kds315/uv_photos for UV Images and lens/filter info
http://photographyoftheinvisibleworld.blogspot.com/ my UV diary
Klaus, that piece is truly a thing of beauty! And I think by far the most elegant and functional design so far. I’m planning something similar as soon as some thick-walled Al tubing arrives. I have some limited machining capability in my home workshop to open the ID a few tenths of a millimeter. Then I’ll drill and tap the three screw holes. I plan to use small thumb screws to hold the lens in place, to allow faster swap of my JML lenses. But mine won’t be turned out of a single piece and nicely black anodized(?) like yours. And it won’t have the custom-made helicoid focus movement, which is just over the top.
I say, who needs one of those boring Canon MP-E things, anyway!?
Bob
I say, who needs one of those boring Canon MP-E things, anyway!?
Bob
Bob in Orange County, CA