^^^+1 
DAMphyne "the more I post, the less accurate..."  More info | Sep 05, 2010 18:32 | #16 ^^^+1 David
LOG IN TO REPLY |
eg6turbo Senior Member 388 posts Joined Oct 2009 Location: San Francisco More info | Sep 05, 2010 20:17 | #17 Recap: so basically all the focal lengths on every lens are the same period. | Canon Rebel T2i Gripped | EF-S 17-55 2.8 IS USM | EF-S 18-55 IS | EF-S 55-250 IS | EF 50 1.8 MK II | EF 85 1.8 USM | Speedlite 430EX II |
LOG IN TO REPLY |
DAMphyne "the more I post, the less accurate..." More info | Sep 05, 2010 20:39 | #18 eg6turbo wrote in post #10856110  Recap: so basically all the focal lengths on every lens are the same period. Most new owners of dslr get confused when comparing focal lengths as it relates to FF vs Crop bodies. Simple way of calculating this: FF- 50 mm lens = 50 mm Crop - 50 mm lens = 85 mm ( 50 x 1.6 crop factor = 85 ) A lens is the focal length it is. David
LOG IN TO REPLY |
SkipD Cream of the Crop  20,476 posts Likes: 165 Joined Dec 2002 Location: Southeastern WI, USA More info | Sep 05, 2010 21:43 | #19 eg6turbo wrote in post #10856110 Recap: so basically all the focal lengths on every lens are the same period. Most new owners of dslr get confused when comparing focal lengths as it relates to FF vs Crop bodies. Simple way of calculating this: FF- 50 mm lens = 50 mm Crop - 50 mm lens = 85 mm ( 50 x 1.6 crop factor = 85 ) IF there is a reason to compare the field of view between two camera formats, then the so-called "crop factor" calculation comes into play. There simply is no other reason to do the calculation. Please read post #5 above carefully to understand this fact. Skip Douglas
LOG IN TO REPLY |
eg6turbo Senior Member 388 posts Joined Oct 2009 Location: San Francisco More info | Sep 06, 2010 04:19 | #20 SkipD wrote in post #10856549 IF there is a reason to compare the field of view between two camera formats, then the so-called "crop factor" calculation comes into play. There simply is no other reason to do the calculation. Please read post #5 above carefully to understand this fact. Stated as a general rule, like has been done in the quote above, is totally wrong. Focal lengths do not change when you put a lens on different format cameras. What I wanted to add but my blackberry wouldn't allow me to edit my post is that 50mm on a crop isn't just field of view...in general without getting too scientific a 50 mm on a crop would get you an equivalent of 85 mm lens...I just think its easier to understand it that way | Canon Rebel T2i Gripped | EF-S 17-55 2.8 IS USM | EF-S 18-55 IS | EF-S 55-250 IS | EF 50 1.8 MK II | EF 85 1.8 USM | Speedlite 430EX II |
LOG IN TO REPLY |
SkipD Cream of the Crop 20,476 posts Likes: 165 Joined Dec 2002 Location: Southeastern WI, USA More info | Sep 06, 2010 05:45 | #21 eg6turbo wrote in post #10857808 What I wanted to add but my blackberry wouldn't allow me to edit my post is that 50mm on a crop isn't just field of view...in general without getting too scientific a 50 mm on a crop would get you an equivalent of 85 mm lens...I just think its easier to understand it that way Why do you want to do this?
The "crop factor" calculation for "35mm equivalent focal length" has only one valid use. That is for comparing lenses used on two different format cameras. Here's one common example: Joe took a photo of Mount Rushmore with a 35mm camera from a particular place using a 200mm lens. You want to replicate that photo with your Canon 50D. What focal length do you need to do that from the same location that he took his photo? Divide the 200mm by 1.6 and you get the answer - 125mm. Here's another popular example: Mary Sue has been using a Canon SX120 IS point-n-shoot camera and is wanting to use a Canon 50D DSLR. She is, of course, interested in what focal lengths she would need to keep the versatility of the SX120 camera's 10X super-zoom lens. The SX120 lens is actually a 6.0mm to 60.0mm lens, but the advertising also shows the "35mm equivalent" focal length range as 36mm to 360mm. To know the focal lengths needed for the 50D, merely divide the "35mm equivalent" values by 1.6. In other words, Mary Sue would need 22.5mm on the short end and 225mm on the long end for the 50D to have the same field (angle) of view coverage as her SX120 IS camera. By the way, a 50mm lens on an APS-C camera provides the same field (angle) of view as an 80mm lens would on a 35mm film camera, not 85mm. Your calculator must have goofed.  Skip Douglas
LOG IN TO REPLY |
xarqi Cream of the Crop  10,435 posts Likes: 2 Joined Oct 2005 Location: Aotearoa/New Zealand More info | Sep 06, 2010 06:04 | #22 eg6turbo wrote in post #10857808 What I wanted to add but my blackberry wouldn't allow me to edit my post is that 50mm on a crop isn't just field of view...in general without getting too scientific a 50 mm on a crop would get you an equivalent of 85 mm lens...I just think its easier to understand it that way That level of understanding must leave you baffled when you look through a smaller window and don't find the view magnified.
LOG IN TO REPLY |
phreeky Goldmember 3,515 posts Likes: 15 Joined Oct 2007 Location: Australia More info | Sep 06, 2010 06:10 | #23 If you only shoot in one format then you have absolutely no reason to bother trying to figure out what "crop factor" is. Just ignore it, otherwise all you'll do is confuse yourself.
LOG IN TO REPLY |
Sep 06, 2010 08:01 | #24 Thanks everyone. I wasn't expecting so many responses. camera, lens, flash, etc
LOG IN TO REPLY |
xarqi Cream of the Crop 10,435 posts Likes: 2 Joined Oct 2005 Location: Aotearoa/New Zealand More info | Sep 06, 2010 08:10 | #25 FSM wrote in post #10858218 Thanks everyone. I wasn't expecting so many responses. Regardless of whether the lens is EF or EF-S, if it is used on a crop body it would take the same focal length x 1.6 to reproduce the same FOV on a FF camera, correct? I have a T1i and no plans to upgrade to a full frame body, so none of this really affects me. EF and EF-S are identical on my camera. Nope, you have it backwards.
LOG IN TO REPLY |
SkipD Cream of the Crop 20,476 posts Likes: 165 Joined Dec 2002 Location: Southeastern WI, USA More info | Sep 06, 2010 08:14 | #26 FSM wrote in post #10858218 Regardless of whether the lens is EF or EF-S, if it is used on a crop body it would take the same focal length x 1.6 to reproduce the same FOV on a FF camera, correct? That is correct. FSM wrote in post #10858218 EF and EF-S are identical on my camera. That is also correct. Skip Douglas
LOG IN TO REPLY |
Sep 06, 2010 08:29 | #27 xarqi wrote in post #10858245 Nope, you have it backwards. Because of the greater cropping of the image circle that occurs, you need a shorter lens on the cropper to achieve the same captured field of view as a larger format would provide. Not backwards, I just didn't word it very clearly. camera, lens, flash, etc
LOG IN TO REPLY |
eg6turbo Senior Member 388 posts Joined Oct 2009 Location: San Francisco More info | Sep 06, 2010 14:47 | #28 xarqi wrote in post #10857957 That level of understanding must leave you baffled when you look through a smaller window and don't find the view magnified. Lol no one mentioned anything about being magnified...I'm more left baffled at your comment. I understand the differences and hopefully the OP does now too. | Canon Rebel T2i Gripped | EF-S 17-55 2.8 IS USM | EF-S 18-55 IS | EF-S 55-250 IS | EF 50 1.8 MK II | EF 85 1.8 USM | Speedlite 430EX II |
LOG IN TO REPLY |
SkipD Cream of the Crop 20,476 posts Likes: 165 Joined Dec 2002 Location: Southeastern WI, USA More info | Sep 06, 2010 15:39 | #29 eg6turbo wrote in post #10859966 Lol no one mentioned anything about being magnified...I'm more left baffled at your comment. I understand the differences and hopefully the OP does now too. I'm still wondering why you feel there is a need to apply the "crop factor" calculation to all of your lenses used on APS-C format cameras. You have not explained that to us. Skip Douglas
LOG IN TO REPLY |
richardfox Goldmember  1,883 posts Joined Oct 2009 Location: Bellbrook, Ohio, USA More info | Sep 06, 2010 16:11 | #30 SkipD wrote in post #10860207 I'm still wondering why you feel there is a need to apply the "crop factor" calculation to all of your lenses used on APS-C format cameras. You have not explained that to us. I'm betting it's an issue of "well, it would be 50mm on FF so it must be 80mm on a crop". Yep, that's correct, but so what? I noticed the difference when leaving my Canon A-1 and my collection of lenses for a 50D. My 28mm, which was "wide" on my A-1, appears more like my 50mm on the 50D. One reason I picked up a 17-40 "L" was to get approximately the same field of view that my 28mm FD lens gave. Canon 50D gripped, EF 50/1.8, EF-S 10-22, 17-40L, 24-105L, 70-200 f/2.8L, 100/2.8 macro, 100-400L, 300 2.8L, Canon 500 f8 mirror with chipped EF mount, 580EX, 1.4x and 2x Canon teleconverters, Canon EF Life-Size converter.
LOG IN TO REPLY |
 | x 1600 |
| y 1600 |
| Log in Not a member yet?
Register to forums
Registered members may log in to forums and access all the features: full search, image upload, follow forums, own gear list and ratings, likes, more forums, private messaging, thread follow, notifications, own gallery, all settings, view hosted photos, own reviews, see more and do more... and all is free. Don't be a stranger - register now and start posting!
|
| ||
| Latest registered member is zachary24 1383 guests, 128 members online Simultaneous users record so far is 15,144, that happened on Nov 22, 2018 | |||
