Can someone please explain this? *Photo Added

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Posted 4/29/2013 by lovetodigi in General Photography
 

lovetodigi
Ancient Ancestor of Pea

PeaNut 257,022
April 2006
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Posted: 4/29/2013 10:58:27 AM
I am so far below an amateur photographer, it"s sad, so I am hoping someone on here can answer this question. My DH has a Canon 7D and I have a Sony A55. This past weekend we went to the zoo. He used a Tamron 18-250 lens. I had a Tamron 18-270. His up close photos were a lot closer up than mine. The main reason that I got the lens was because I like to take really close up photos and would rather not have to carry several lens and change them out at place like a crowded zoo. That and the fact that we were going to stop by Ikea on the way back and didn't want to leave a lot of lens in the car. Like I said, I am below an amateur and really should devote more time learning photography. I think that will be one of goals for this summer. For now, can someone explain to me why he was able to get closer shots with his lens than I did with mine? Is it the difference in cameras or is my lens defective? I was really disappointed when I compared the photos taken in the same spots at the same time.




Sony a77
Sony 18-70mm F3.5/5.6, Sony 75-300mm f/4.5-5.6,
Sony 50mm 1.8, Sony DT 35mm f/1.8 SAM
Tamron SP 90mm f/2.8 Di 1:1 AF Macro AF
Tamron 18-270mm F/3.5-6.3 AF Zoom with Macro
MacBook Pro 15" (Mid 2012)
Photoshop CS6 & PSE 11
Lightroom 4

voltagain
OklaPhoma

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Posted: 4/29/2013 12:17:54 PM
I was really disappointed when I compared the photos taken in the same spots at the same time.
>>>>>>>>>>>>>>>>>>>>>>>>

You may want to post an example. One of his and one of yours from the same spot.

My guess is a couple of things. First being maybe you weren't using the same focal lenghts. If he used a 250 and you used a 200 the end results will be quite different. Check the exif (metadata) on the files to see if same focal lenght was used on images you feel should be the same.

The second thing is, being close to the same spot, but not in the exact same spot will make a difference. Depending on what you are shooting just a couple of feet can make a bit impact.

The third is the sensor are not identical. They are very close but they are different. I'm not sure they are different enough for it to make a big impact on the images. It is possible.

A quick test you can run at home is to pick a subject out in the front of your home. Fix both cameras with thier lenses and set both lenses to the exact same focal length; say 200mm. take a picture with one. Then without moving your feet pick up the other camera and take the same picture. If they aren't really close to the same then the issue is a lens malfunction. Because the sensors are different you may see a small amount of variance between the two.


What Your Kit Lens Can Do For You

Canon 60d, Canon 24-70mm 2.8L, Canon 70-200mm 2.8L, 50mm 1.8, 28-80, 75-300mm and Tamron 90mm 2.8 macro

memories5
StuckOnPeas

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Posted: 4/29/2013 12:23:40 PM
Show us an example and we can help you more


Jennifer~
I think a photography class should be a requirement in all educational programs because it makes you see the world rather than just look at it.

lovetodigi
Ancient Ancestor of Pea

PeaNut 257,022
April 2006
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Posted: 4/29/2013 5:06:48 PM
Thanks for the input. I have looked through and tried to find two that were taken at pretty much the same spot with one one being at 280 and one being at 250. They are not some of the best photos taken that day, but it will show the difference between the two. Maybe it is about where it should be, but I would have thought that the one taken at 280 would be a closer shot than the one taken at 250. I will do the test this weekend that you suggested Volt. Thanks.

Here is one take at 280 and this one at 250




Sony a77
Sony 18-70mm F3.5/5.6, Sony 75-300mm f/4.5-5.6,
Sony 50mm 1.8, Sony DT 35mm f/1.8 SAM
Tamron SP 90mm f/2.8 Di 1:1 AF Macro AF
Tamron 18-270mm F/3.5-6.3 AF Zoom with Macro
MacBook Pro 15" (Mid 2012)
Photoshop CS6 & PSE 11
Lightroom 4

voltagain
OklaPhoma

PeaNut 18,334
July 2001
Posts: 38,143
Layouts: 15
Loc: State of cultural confusion. Yeehaw and Aloha have collided!

Posted: 4/29/2013 9:21:21 PM
They are much closer than I was expecting. The difference can certainly be explained by a difference in position of the shooter. Even though you were both "pretty much" in the same place that means you weren't exactly in the same place. A distance of 5-8 ft [normal personal space] may not seem like much of a difference when standing chatting with someone but it will cause a difference in image outcome.


What Your Kit Lens Can Do For You

Canon 60d, Canon 24-70mm 2.8L, Canon 70-200mm 2.8L, 50mm 1.8, 28-80, 75-300mm and Tamron 90mm 2.8 macro

mightyme
PeaAddict

PeaNut 562,444
August 2012
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Posted: 4/29/2013 9:43:29 PM
one thing I was thinking. What is the heigh difference between you and dh?

heartcat
International Association of Epic Length Posters

PeaNut 51,429
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Posted: 4/29/2013 10:36:14 PM
I have no idea how it works, but your camera and dh's camera have slightly different crop factors. I think yours is 1.53 and his is 1.6. I wonder if that might make a difference?

Whether 250mm with a crop factor of 1.6 might give more 'reach' than 270mm on a 1.53? Someone who understand what those numbers mean and how they translate might know if there could be something to that or whether that has nothing to do with it at all. I really have no clue, lol, but that is just something I wondered about.


***********
Canon 7D with grip; Jupiter-37A 135mm 3.5; Carl Zeiss Jena 135mm 3.5; Jupiter-11A 135mm 4; Pentacon 135mm 2.8; Nikkor-P 105mm 2.5; RMC Tokina 80-200mm 4.5; Helios 44-2 58mm 2; Super Takumar 55mm 1.8; Vivitar 35mm 2.8; RMC Tokina 28mm 2.8; RMC Tokina 35-70mm 3.5; Panagor 90mm 2.8 macro; Canon 18-55mm IS; Canon 55-250mm IS; Canon 50mm 1.8; Canon 24-105mm f/4 L


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