reversing troubles

calypsob · 19th of April 2012 (Thu)

i have a sigma 70-210 uc zoom f/4 for a pentax, and I decided to get an eos mount reversing ring for this lens. It is a macro/tele and I thought it was going to be functional as a good macro but when I reversed it I could only focus about 5 ft. away and thats it, no macro, and when I zoom it seems to go way out of focus , I have no idea what is going on with it. Are telephoto lens supposed to be reversed? What am i doing wrong?

LordV · 20th of April 2012 (Fri)

Quote:

Originally Posted by calypsob

i have a sigma 70-210 uc zoom f/4 for a pentax, and I decided to get an eos mount reversing ring for this lens. It is a macro/tele and I thought it was going to be functional as a good macro but when I reversed it I could only focus about 5 ft. away and thats it, no macro, and when I zoom it seems to go way out of focus , I have no idea what is going on with it. Are telephoto lens supposed to be reversed? What am i doing wrong?

No tele lenses will not give increased mag if reversed to the camera body. People normally reverse a 50mm or shorter focal length lens.
A reversed 50mm lens gives around 1:1 mag and a reversed 28mm lens gives around 3:1. If you got a kit lens try reversing that.
Brian v.

Techuser · 20th of April 2012 (Fri)

With a telephoto you're better off using close-up filters

gmillerf · 23rd of April 2012 (Mon)

You could also use extension tubes to let you focus on things closer using the magnification already in the lens.

19th of April 2012 (Thu)	#1
calypsob Member Join Date: Jan 2012 Location: auburn alabama Posts: 615	reversing troubles i have a sigma 70-210 uc zoom f/4 for a pentax, and I decided to get an eos mount reversing ring for this lens. It is a macro/tele and I thought it was going to be functional as a good macro but when I reversed it I could only focus about 5 ft. away and thats it, no macro, and when I zoom it seems to go way out of focus , I have no idea what is going on with it. Are telephoto lens supposed to be reversed? What am i doing wrong?

20th of April 2012 (Fri)	#3
Techuser Member Join Date: Apr 2007 Location: Brazil Posts: 447 IMAGE EDITING OK	Re: reversing troubles With a telephoto you're better off using close-up filters __________________ Canon XSi \| 18-55 IS \| 50 1.8 \| 70-300 IS \| 300 2.8 FD

23rd of April 2012 (Mon)	#4
gmillerf Member Join Date: Jan 2012 Posts: 116	Re: reversing troubles You could also use extension tubes to let you focus on things closer using the magnification already in the lens.

Thread Tools
Show Printable Version Email this Page
Display Modes
Switch to Linear Mode Hybrid Mode Switch to Threaded Mode

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Reversing EF-s 18-55 3.5-5.6 II, Help	KarlosDaJackal	Canon EF and EF-S Lenses	8	13th of March 2009 (Fri) 10:30
Reversing lenses on each other?	Muskydave22	Canon EF and EF-S Lenses	4	9th of March 2009 (Mon) 21:32
Reversing a lens	pagnamenta	Macro	3	16th of March 2007 (Fri) 01:11
reversing	cinci-photo	Macro	5	20th of October 2006 (Fri) 23:48
lens reversing	smasraum	Macro	5	3rd of September 2005 (Sat) 22:30