Exercise with Extenders
Jun 29, 2013 21:59:17 #
photonphysicist
Loc: Texas
The photos below shows the following sequence of shots:
1. 200mm (no extender) f/2.8, ISO 800
2. 200mm + 1.4x extender f/4.0, ISO 800
3. 200mm + 2.0x extender f/5.6, ISO 800
4. 200mm + 1.4x + 2.0x extenders f/8.0, ISO 800
Obviously, for each shot I had to adjust the shutter speed to get the correct exposure.
The autofocus and metering worked correctly in all cases.
The sequence clearly shows that even with "good glass" the more glass you add, the more distortion is added.
Interesting little exercise so I thought I'd share the results.
1. 200mm (no extender) f/2.8, ISO 800
2. 200mm + 1.4x extender f/4.0, ISO 800
3. 200mm + 2.0x extender f/5.6, ISO 800
4. 200mm + 1.4x + 2.0x extenders f/8.0, ISO 800
Obviously, for each shot I had to adjust the shutter speed to get the correct exposure.
The autofocus and metering worked correctly in all cases.
The sequence clearly shows that even with "good glass" the more glass you add, the more distortion is added.
Interesting little exercise so I thought I'd share the results.
1. 200mm (no extender) f/2.8, ISO 800
2. 200mm + 1.4x extender f/4.0, ISO 800
3. 200mm + 2.0x extender f/5.6, ISO 800
4. 200mm + 1.4x + 2.0x extenders f/8.0, ISO 800
Jun 29, 2013 22:02:19 #
Jun 29, 2013 22:06:32 #
photonphysicist
Loc: Texas
Xtreme66 wrote:
I only see the first shot.
Had to load them one at a time. All four are now posted.
Jun 29, 2013 22:24:37 #
Walt, even with the 1.4 and 2 in tandem the pic is not too shabby. Thanks for sharing. BTW, who is the manufacturer of the 200mm lens and the teleconverters?
Jun 29, 2013 22:45:35 #
Very interesting.
I wonder how doing a crop from the "unextended" image compares to an image with the extender on the lens in terms of detail and sharpness retention.
I'm still undecided about getting an extender or not. As I rarely print anything over 8x10, I'm not sure if an extender will be all that beneficial to me - if simply cropping to the desired section will give me nearly the same image quality as using an extender during shooting.
I wonder how doing a crop from the "unextended" image compares to an image with the extender on the lens in terms of detail and sharpness retention.
I'm still undecided about getting an extender or not. As I rarely print anything over 8x10, I'm not sure if an extender will be all that beneficial to me - if simply cropping to the desired section will give me nearly the same image quality as using an extender during shooting.
Jun 29, 2013 22:48:32 #
photonphysicist wrote:
The photos below shows the following sequence of s... (show quote)
Good test. I like the way your "Hidden Hitch" announces itself. :-D
"Hey! Look, I'm down here. See me? I'm a Hidden Hitch. :D
Jun 30, 2013 00:27:48 #
photonphysicist
Loc: Texas
Db7423 wrote:
Walt, even with the 1.4 and 2 in tandem the pic is not too shabby. Thanks for sharing. BTW, who is the manufacturer of the 200mm lens and the teleconverters?
All 3 are Canon branded.
Jun 30, 2013 00:37:07 #
photonphysicist
Loc: Texas
rook2c4 wrote:
Very interesting.
I wonder how doing a crop from the "unextended" image compares to an image with the extender on the lens in terms of detail and sharpness retention.
I'm still undecided about getting an extender or not. As I rarely print anything over 8x10, I'm not sure if an extender will be all that beneficial to me - if simply cropping to the desired section will give me nearly the same image quality as using an extender during shooting.
I wonder how doing a crop from the "unextended" image compares to an image with the extender on the lens in terms of detail and sharpness retention.
I'm still undecided about getting an extender or not. As I rarely print anything over 8x10, I'm not sure if an extender will be all that beneficial to me - if simply cropping to the desired section will give me nearly the same image quality as using an extender during shooting.
I cropped the first image (200mm only) to approximately the same size as the fourth image (200mm + 1.4x + 2.0x) for your review.
200mm (no extender) cropped
Jun 30, 2013 05:29:27 #
photonphysicist wrote:
The photos below shows the following sequence of s... (show quote)
What are your conclusions?
Jun 30, 2013 05:43:27 #
melismus
Loc: Chesapeake Bay Country
Telextenders cannot improve on the resolution of a lens, merely spread it over more pixels. To my eye the crop is sharpest and cleanest.
Paul
Paul
Jun 30, 2013 07:34:42 #
my conclusion, if you have a near perfect exposure then cropping is the way to go.however if the croped image looks bad then a good lens with a good extender will yield good images. i have a minolta 200mm apo hi speed f2.8 lens and the minolta 2x converter i am more than happy with the results.
Jun 30, 2013 07:46:05 #
photonphysicist
Loc: Texas
jeep_daddy wrote:
What are your conclusions?
1. Best to shoot without the extender - if possible; however
2. There are times when more millimeters are needed to "reach" the subject. Therefore, the extenders I have, while gobbling up 1 and 2 stops of light, respectively are useful tools;
3. I will use these tools until I have saved the money to purchase a Canon EF 400mm f/2.8 L lens.
Jun 30, 2013 07:56:06 #
majeskiphoto
Loc: Hamilton, Ontario
All I can say is, my 80-200 2.8LMKII with
2X MKIII produces much better results
than Your example.
You did use a tripod, right?
My result, with just the 2X, is much improved
over just cropping.
2X MKIII produces much better results
than Your example.
You did use a tripod, right?
My result, with just the 2X, is much improved
over just cropping.
Jun 30, 2013 09:59:16 #
peterg
Loc: Santa Rosa, CA
Great demo. Thanks. I agree with your conclusions.
The more you "extend" the more loss of quality. Buy the best glass you can afford.
:)
The more you "extend" the more loss of quality. Buy the best glass you can afford.
:)
Jun 30, 2013 10:23:52 #
photonphysicist wrote:
I cropped the first image (200mm only) to approximately the same size as the fourth image (200mm + 1.4x + 2.0x) for your review.
Thanks!
To me, the cropped, without extender example doesn't look any inferior to the sample using the two extenders. In fact, on my monitor screen the cropped image actually appears to be the superior image.
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