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FORUMS Photography Talk by Genre Macro Talk
Thread started 22 Apr 2012 (Sunday) 14:35
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Reverse mounting on a zoom- general questions

 
Tom ­ Camilleri
Senior Member
641 posts
Joined Jan 2005
Long Island, NY
Apr 22, 2012 14:35 |  #1

I want to reverse mount my 28mm EF 1.8 on 100-300mm telephoto zoom. Is there a bayonet adapter which can be used with a filter to protect the contacts and exposed glass on the 28mm? The zoom has a 58mm filter connector so a 58mm coupler will be perfect. The zoom itself is around 9 inches long. Will a coupler be sturdy enough to hold the weight of the 28mm safely?

When focusing this setup should I use the zoom autofocus, the zoom manual (in either case, should the 28mm be pre-focused before mounting?) or the 28mm lens' manual focus? Might be best to focus from a distance on a point manually.

The zoom is an old L with really great(!) optics but somewhat clunky autofocus which has three focus modes: M, 2m to infinity, macro to infinity. I don't know what the working distance is for the macro setting. Aperture range is f/5.6 to 32.

I should be able to get huge magnification with this rig. Any insights on what working distance and best possible DOF might be? I'm thinking it might be great on a tripod for butterflies and such.


40D, Digital Rebel 300D; EF-S 17-55 f/2.8 IS, EF 28-135 IS, EF 50mm f/2.5 Compact Macro, 85mm f/1.8, 28mm f/1.8, Speedlite 380 EX, Sekonic L758DR w/target, Manfrotto 3021 w/3030 pan-tilt head & quick release plate, POTN Strap

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tonylong
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Apr 22, 2012 18:33 |  #2

I can't answer your specific questions, but there are other threads going on about reverse-mounting you can check out:

http://photography-on-the.net .../showthread.php?t=1​176275

http://photography-on-the.net .../showthread.php?t=1​175600

http://photography-on-the.net .../showthread.php?t=1​173032

In addition, if you look at the bottom of this page in the Similar Threads section, you will see that your thread title had key words that triggered a forum "mini-search" with some good results.

Now, while you are looking at those threads, maybe someone who knows more "stuff" about this than I do can chime in, or you might want to PM LordV who knows a lot (he posted in the first thread I linked to).

Hope this helps you to at least get started!


Tony
Two Canon cameras (5DC, 30D), three Canon lenses (24-105, 100-400, 100mm macro)
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Tom ­ Camilleri
THREAD ­ STARTER
Senior Member
641 posts
Joined Jan 2005
Long Island, NY
Apr 22, 2012 20:03 |  #3

Thanks Tony. Interesting threads. I have a camera mount reverse adapter and reverse coupler on order. Around $15 total with free shipping from Adorama so it's cheap to experiment. With three or four lenses which will work with them there will be a number of possible combinations.


40D, Digital Rebel 300D; EF-S 17-55 f/2.8 IS, EF 28-135 IS, EF 50mm f/2.5 Compact Macro, 85mm f/1.8, 28mm f/1.8, Speedlite 380 EX, Sekonic L758DR w/target, Manfrotto 3021 w/3030 pan-tilt head & quick release plate, POTN Strap

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Reverse mounting on a zoom- general questions
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