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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 13 May 2010 (Thursday) 11:16
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Stacking 1.4x and 2X. What order?

 
jgatti
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May 13, 2010 11:16 |  #1

I am trying to get a picture of some baby hawks in a nest and want to stack my tc's to get the most reach possible. In what order should I stack them. 1.4x attached to lens, then 2x attached to 1.4x? Or other way around?

Thanks.


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May 13, 2010 11:24 |  #2

I don't believe order has anything to do with most reach possible, it's the same FOV no matter which order you put them. However your IQ could vary depending on which TC is first. You may just have to try. I have heard many say they use this combo: body + 1.4x + 2x + lens


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phigment
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May 13, 2010 11:25 |  #3

Optically I don't think it should matter. But only one of the TCs will be reported (edit: I'm not certain about this.. can anyone confirm?). I don't know which way is which, but you can try it and find out.

Seeing that you would likely loose AF anyways (assuming you aren't using a 1 series or a lens faster than f/2).

My choice would be to have the 2X the reporting TC so that the exif data is a little closer to the actual scenario.


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Heatseeker99
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May 13, 2010 11:39 |  #4

I believe the TC attached to the LENS reports.


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egordon99
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May 13, 2010 12:16 |  #5

jgatti wrote in post #10174009 (external link)
I am trying to get a picture of some baby hawks in a nest and want to stack my tc's to get the most reach possible. In what order should I stack them. 1.4x attached to lens, then 2x attached to 1.4x? Or other way around?

Thanks.

200x1.4x2=560
200x2x1.4=560

Amazing, eh? :lol:




  
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Mk1Racer
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May 13, 2010 12:34 |  #6

I know that with my Kenko 1.4x TC and my Canon 2x TC that I would have to mount them in the following order:

Body > 1.4x TC > 2x TC > lens

The Canon 2x TC protrudes in the front, and would not accept the 1.4x Kenko TC.


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Katalyst
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May 13, 2010 12:43 |  #7

He's not talking reach, but IQ... 2x would degrade the picture the most so he's asking in what order to attach them, correct me if I'm wrong!?




  
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egordon99
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May 13, 2010 12:44 |  #8

Katalyst wrote in post #10174505 (external link)
He's not talking reach, but IQ... 2x would degrade the picture the most so he's asking in what order to attach them, correct me if I'm wrong!?

Maybe I misread it, but "want to stack my tc's to get the most reach possible. In what order should I stack them." seemed to indicate he was wondering how to stack them to get the most reach.




  
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tkbslc
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May 13, 2010 12:47 |  #9

Are these for your 200L? I have a hard time believing that stacking the 1.4x and the 2x would give much better results than cropping a bit with just the 2x and uprez-ing in post if needed. Especially since using just the 2x would still allow AF and the 1.4x would require some manual assistance.


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May 13, 2010 12:52 as a reply to  @ tkbslc's post |  #10

How much more expensive is a 400mm f/5.6 L compared to the price of the two teleconverters? Might be worth saving up a bit extra, sell the teleconverters, and buy a proper 400mm lens.




  
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macroimage
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May 13, 2010 12:55 |  #11

With my Sigma teleconverters (both 1.4x and 2x protrude into the back of the lens), the 2x unit has a space in the back to fit the protrusion from the 1.4x. The 1.4x doesn't have this so you must put the 2x to the lens, and the 1.4x behind it. I believe that the Canon TCs are the same.


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Tom ­ W
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May 13, 2010 13:08 |  #12

I can't speak for other brands, but with the Canon teleconverters, you have to put the 2X on the lens, and then the 1.4X between the lens and the body. The 1.4X's rear lens element is nearly flush with the back of the teleconverter so the 2X's protruding front lens cannot fit.

So it would be camera, then 1.4X, then 2X, then lens.


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May 13, 2010 13:15 |  #13

tkbslc wrote in post #10174531 (external link)
Are these for your 200L? I have a hard time believing that stacking the 1.4x and the 2x would give much better results than cropping a bit with just the 2x and uprez-ing in post if needed. Especially since using just the 2x would still allow AF and the 1.4x would require some manual assistance.

Interesting statement. With my 5D and 5D2, I found that stacking teleconverters on a 400/2.8 lens brought me the best results, better than using the 2X and cropping. But with the 7D, that is no longer true. The high pixel density and visible diffraction render the stacked image softer than the non-stacked imaged, even when the image sizes are equalized in post processing. In other words, the images taken with the 7D, 400/2.8, and 2X teleconverter resolve better than images taken with the 7D, 400/2.8, 2X, and 1.4X stacked, even when the stacked image is downsized by 1.4X in post processing to match the apparent size of the single teleconverter image.

I think that the main culprit in this case is that I'm shooting effectively an 1120 mm f/8 lens, and the best results from the stacked combination come around f/13-f/14. Shooting at f/13 or f/14 on a 7D will show visible diffraction when viewed at or near 50% to 100% on the screen. And if I'm using that much lens, it's a good bet that I'm needing all the magnification I can get.


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May 13, 2010 13:39 |  #14

egordon99 wrote in post #10174514 (external link)
Maybe I misread it, but "want to stack my tc's to get the most reach possible. In what order should I stack them." seemed to indicate he was wondering how to stack them to get the most reach.

+1 :)


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May 13, 2010 13:47 |  #15

True, but you'd still end up buying a 1.4 anyway

egordon99 wrote in post #10174557 (external link)
How much more expensive is a 400mm f/5.6 L compared to the price of the two teleconverters? Might be worth saving up a bit extra, sell the teleconverters, and buy a proper 400mm lens.


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Stacking 1.4x and 2X. What order?
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