Stacked Teleconverters
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Old 04-08-2013   #1
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Default Stacked Teleconverters

The Cooper's hawk I shot yesterday flew into the same tree just as I was driving up this evening. Higher in the tree this time, and with heavy overcast the light was pretty drab.

So I decided to do an experiment.

70-200 f/2.8 VRII + TC-20 III + Tamron 1.4x for an effective 560mm on a crop sensor body (840mm equiv fov). The blown sky washed things out a bit - shorter exposures didn't have any more contrast, they were just darker.

Mounted on a crappy tripod - triggered with the self timer and exposure delay mode.
ISO 400 f/16 1/50th MF.

In order the images are
1) full frame SOOC
2) 100% crop SOOC
----- quick edit -----
3) Full frame
4) Cropped to what I might post
5) 100% crop.

It took some pretty hard tweaking to get what I did from that shot, but in desperate times, good light, static subjects, it's an option until my rich uncle buys that collection of Nikon prime telephoto lenses for me.

I'll try it again when I'm not pointing the lens into a white sky.

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Attached Images
File Type: jpg StackedTCsooc.jpg (198.6 KB, 289 views)
File Type: jpg StackedTCsooc2.jpg (184.2 KB, 279 views)
File Type: jpg StackedTC.jpg (203.6 KB, 273 views)
File Type: jpg StackedTCCrop.jpg (193.3 KB, 284 views)
File Type: jpg StackedTC100.jpg (199.5 KB, 281 views)
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Old 04-08-2013   #2
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Default Re: Stacked Teleconverters

I agree that #4 is the best of the lot.

The quality is surprisingly good considering stacked TCs.

With the same equipment, I would have tried the same thing.

Nice work.
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Old 04-08-2013   #3
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Default Re: Stacked Teleconverters

You get no points for not trying something.

Somethings don't work, some do. It seems like your stacked TCs worked well. Good job.
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Old 04-09-2013   #4
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Default Re: Stacked Teleconverters

Good work Karl. A lot depends on the lens itself though. With my 70-300 DO, an inherently low contrast lens, adding TCs produce very flat images. But with 100-400 L, even stacked TCs (Kenco 2x + 1.5x) produce some usable pictures. A high contrast subject also helps in gettting an usable image. Here is one of mine with 100-400 and stacked TCs. Needed a good dose of contrast enhancement & sharpening though.

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Old 04-09-2013   #5
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Default Re: Stacked Teleconverters

Nice job Karl! The PP work helped a lot!
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Old 04-25-2013   #6
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Default Re: Stacked Teleconverters

Take a look at this combination...

IMG_9826.jpg photo - romy ocon photos at pbase.com

BTW: while you are on Romy Ocon's site, peruse his great images of the birds of the Philippines...
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Old 04-26-2013   #7
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Default Re: Stacked Teleconverters

Pretty nice results given the circumstances, Karl.
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Old 04-28-2013   #8
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Default Re: Stacked Teleconverters

I was wondering when someone was going to post a stacked TC thread. I have a very sharp Canon EF 300L f4 and have stacked an EF 1.4 II and an EF 2 II with results similar to Zemlins. I do it mostly when just playing around but have thought of trying it more often. With a 1.6 sensor this is the equivalent (35mm) focal length of 1355mm but the max aperture is reduced to f11 which kills auto focus. I have tried some bird shots but the biggest immediate difficulty is finding and focusing on the subject, tough with living subjects. It's more like an astronomical scope. I also add an extension tube when shooting butterflies and dragonflies, gets me down to about 7 feet. At this distance the insect fills the frame with only one TC.
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Old 04-28-2013   #9
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Default Re: Stacked Teleconverters

Karl would not know you had problems creating this photo because number 4 sure is great, and isn't fun to experiment to see what happens.
There are some nice solid tripods out there for short money:
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Old 04-28-2013   #10
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Default Re: Stacked Teleconverters

Of course the big issue with stacking TC's is the light loss. Shooting at F/16 may be acceptable, but what ISO was needed to get acceptable shutter speeds? I see some small amount of noise in the shots, and was curious.

That in no way degrades these shots, it is awesome to try and know and the shots ended up coming out great. That loss of contrast and even that minor CA is a complete non-issue with today's photo editing software.


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