close up lenses

What you see is what you get, including photography, displays, and video equipment.

Moderators: Dposcorp, SpotTheCat

close up lenses

Postposted on Thu Nov 06, 2008 12:33 pm

I just picked up these from eBay. I figured that for $20 it's probably worth the trial. Anyone have any experience with these things?
For those that fought for it, freedom has a taste that the protected will never know.
-Unknown Veteran
Hoser
Lord High Gerbil
 
Posts: 8307
Joined: Sat Mar 02, 2002 7:00 pm
Location: In a lab playing with blood

Re: close up lenses

Postposted on Thu Nov 06, 2008 12:49 pm

Diopters can be good. Cheap ones are somewhat hit and miss. They reduce the effective focal length and working distance, and work better on long focal lengths. John Shaw's book Closeups in Nature has a lot of information. Google took me to where he discusses using diopters on a 50mm lens. In summary, a +10 gets you to 1:2 magnification and lowers your effective focal length to about 33 mm. That gets to be a bit difficult to deal with as working distance becomes really, really close. My cheapo macro came with a diopter to get to 1:1 but I normally use tubes instead.
...
mattsteg
Gerbil God
 
Posts: 15761
Joined: Thu Dec 27, 2001 7:00 pm
Location: Applauding the new/old variable width forums

Re: close up lenses

Postposted on Fri Nov 07, 2008 11:11 am

I bought some of those for really cheap. You can see some samples I posted in this topic.
Considering the price I payed for them, I'm fairly satisfied. The main drawbacks for me were loss of sharpness (especially off-center), loss of contrast and heavy colour fringing.
quock
Gerbil
 
Posts: 35
Joined: Thu Aug 26, 2004 10:38 am


Return to Visual Haven

Who is online

Users browsing this forum: No registered users and 5 guests