With regard to vignetting; if I put the Sigma 105mm macro normally on my EOS 5D (full frame sensor) and then reverse a 50mm f1.8 on the front it vignettes severely, certanly such that the edges and corners would be unusable. maybe it's a sensor size issue and would be less severe on a cropped sensor?
Adrian
Adrian if you some tubes you can usually put the smallest tube on first and that will cure the problem most of the time . you might have to use around 25mm's of tube for the FF cam.
Everyone , remember that this thread is mainly trying to show that with just a single 50 , 35, or 28mm lens mounted directly to the front of the camera body you can get wonderful shots for next to nothing out of pocket.
Tom Hicks wrote:
Everyone , remember that this thread is mainly trying to show that with just a single 50 , 35, or 28mm lens mounted directly to the front of the camera body you can get wonderful shots for next to nothing out of pocket.
Nevermind found them, I never new that kind of mount existed, just the lens to lens mounts. I don't do much macro I will definitly play with this on my 28 2.8 ais though...
Also keep in mind that a lot of us didn't walk into a camera shop and buy it all at once. A lot of my kit I picked up a piece at a time, often having to wait to use one piece while I saved up money for the next...
I think the bigger problem is that people come here, see the images that people post, and think it's easy to do -all you need is the gear. Tight rope walking always looks easy when you watch it from the ground...
I can't find a ring for my 50mm. Anyone know of a place...already checked Ebay, etc. Was thinking of making one from an old camera cap, clean out the plastic in the center with a dremel tool, then knocking the glass from an old filter, try bonding the two together...thought it would work almost the same if I can't find an adapter ring.
Like normal lens 28, 50 and 135mm focal lengths, the image gets larger for the longer focal length.
What is the relationship of lens focal length when reversed? Is that reversed too?
Like the image would get larger going from 135 to 50 to 28mm.
Is that correct?
If so, then I would assume the DOF would be shorter on the shorter FL lenses.
Also, based on the lens to sensor length being constant when the lenses are mounted normally, would the subject to lens working distance would be the same?
bigdphoto wrote:
I can't find a ring for my 50mm. Anyone know of a place...already checked Ebay, etc. Was thinking of making one from an old camera cap, clean out the plastic in the center with a dremel tool, then knocking the glass from an old filter, try bonding the two together...thought it would work almost the same if I can't find an adapter ring.
Has anyone tried this method yet?
Yes that is how I made my first one some 4 years ago.still works today. Ebay is full of people that sell the rev. adapters .
who me wrote:
Like normal lens 28, 50 and 135mm focal lengths, the image gets larger for the longer focal length.
What is the relationship of lens focal length when reversed? Is that reversed too?
Like the image would get larger going from 135 to 50 to 28mm.
Is that correct?
If so, then I would assume the DOF would be shorter on the shorter FL lenses.
Also, based on the lens to sensor length being constant when the lenses are mounted normally, would the subject to lens working distance would be the same?
the smaller the lens the greater the magnification and the closer the working dist , just hold a lens in rev to the front of the camera body and you can see what you will get , heck go ahead and take a few shots .
Here's a Zebra spider done with a Pentax 50mm f/1.4 reverse coupled to 100mm Macro plus a Life Size Converter. Not sure about magnification. Maybe 3:1. Would be great to have more working distance if anyone has any ideas...
the smaller the lens the greater the magnification and the closer the working dist , just hold a lens in rev to the front of the camera body and you can see what you will get ...
I just tried this for the first time. Man, greater than 1:1 magnification is addictive!
-but I am just hold the lenses together. DOF is razor thin, virtually impossible to do hand-held.
Are there any guidelines here, any know FL combinations that work well?
Also, is it best to start with the lenses focused (in normal mode) for close, or for infinity?
I just tried this for the first time. Man, greater than 1:1 magnification is addictive!
-but I am just hold the lenses together. DOF is razor thin, virtually impossible to do hand-held.
Are there any guidelines here, any know FL combinations that work well?
Also, is it best to start with the lenses focused (in normal mode) for close, or for infinity?
Either make or buy a reversing ring for eos mount if you shoot canon or one for the nikon mount . screw a 28mm lens on and you should have close to 3 x . I don't pay much attention to where the focus ring is is make little to no difference . Hope this helps. you can buy the rings at a good independent camera shop or on ebay. type in reversing rings .
I dont really get it . Can you only do this with a prime lens ? I just tried holding my 17-50 reversed to my camera , and I either get a shot thats all black , or just blur ..
Take any prime 100mm or over and attach your 50mm to the front , to give you an idea of the mag you get divide 50 into the mm of the lens you are attaching it to.
50 into 100 = 2X
50 into 200 = 4X
get the idea. If you use a 100mm with the 50 you might get some vignetting if so add a 12mm extension tube to the camera first then the lens .
I dont know how your camera does that, when I try to turn my camera on, take the lens off, and hold it to the body backwards, even with the flash , I just get like a all gray or black screen .
