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What exactly is different inside a lens in Macro mode?
What exactly is different about a lens in Macro mode? Does the lens alter
its optics in some way to focus more closely? My Galaxy S7 lens doesn't seem to have enough space inside to shift any elements in a different way. Although my point and shoot has a lens which comes forward and is made of 6 elements in 5 groups. How do these cameras provide Macro mode? If a camera can provide close up macro focusing then why isn't it provided as part of Normal mode? |
What exactly is different inside a lens in Macro mode?
In article , Sammy
wrote: What exactly is different about a lens in Macro mode? Does the lens alter its optics in some way to focus more closely? yes. |
What exactly is different inside a lens in Macro mode?
On Fri, 8 Jun 2018 10:18:35 -0400, Ken Hart wrote:
On 06/08/2018 07:09 AM, Sammy wrote: What exactly is different about a lens in Macro mode? Does the lens alter its optics in some way to focus more closely? My Galaxy S7 lens doesn't seem to have enough space inside to shift any elements in a different way. Although my point and shoot has a lens which comes forward and is made of 6 elements in 5 groups. How do these cameras provide Macro mode? If a camera can provide close up macro focusing then why isn't it provided as part of Normal mode? The simple answer is in order to focus more closely, the lens must be moved farther away from the focal plane (the film or image sensor). This is why, in the "old days", we had bellows units (or extension tubes) that could be fitted between the lens and camera body. A common large format view camera is designed with a bellows and focusing rail that may allow the lens to move away from the film sufficiently to give 1:1 magnification. That's the simple answer, and generally applies to a common single element convex lens. Very few cameras use a single element convex lens- the Holga is a common exception. If you want an exact, specific answer, it will cost you: probably a PhD in physics and light, and in mechanics. See you back here in six to eight years! The cheap and dirty macro method is to get a set of close-up lenses that mount on the front of your camera lens. I get quite reasonable results (good enough for eBay) by holding a +2 close-up lens in front of my point & shoot camera. I get exceptional results by mounting a bellows or extension tubes on my 35mm SLR and using a macro lens. Thanks for the answer. My smartphone camera and my point and shoot don't seem to have any arrangement to move lenses further out or do much anything different. Is Macro mode on such cameras essentially a con because their Normal mode can focus as close as macro mode? |
What exactly is different inside a lens in Macro mode?
In article , Sammy
wrote: What exactly is different about a lens in Macro mode? Does the lens alter its optics in some way to focus more closely? My Galaxy S7 lens doesn't seem to have enough space inside to shift any elements in a different way. Although my point and shoot has a lens which comes forward and is made of 6 elements in 5 groups. How do these cameras provide Macro mode? If a camera can provide close up macro focusing then why isn't it provided as part of Normal mode? The simple answer is in order to focus more closely, the lens must be moved farther away from the focal plane (the film or image sensor). This is why, in the "old days", we had bellows units (or extension tubes) that could be fitted between the lens and camera body. A common large format view camera is designed with a bellows and focusing rail that may allow the lens to move away from the film sufficiently to give 1:1 magnification. That's the simple answer, and generally applies to a common single element convex lens. Very few cameras use a single element convex lens- the Holga is a common exception. If you want an exact, specific answer, it will cost you: probably a PhD in physics and light, and in mechanics. See you back here in six to eight years! The cheap and dirty macro method is to get a set of close-up lenses that mount on the front of your camera lens. I get quite reasonable results (good enough for eBay) by holding a +2 close-up lens in front of my point & shoot camera. I get exceptional results by mounting a bellows or extension tubes on my 35mm SLR and using a macro lens. Thanks for the answer. My smartphone camera and my point and shoot don't seem to have any arrangement to move lenses further out or do much anything different. not all lenses do because macro is nowhere near as common as ordinary photos. Is Macro mode on such cameras essentially a con because their Normal mode can focus as close as macro mode? no, and it can't. if you want to do macro with a lens that lacks a macro setting or can't focus close enough, get a closeup lens attachment. there are a number of them available, along with telephoto, wide angle, fisheye and others. |
What exactly is different inside a lens in Macro mode?
On 6/8/2018 1:22 PM, Sammy wrote:
On Fri, 8 Jun 2018 10:18:35 -0400, Ken Hart wrote: On 06/08/2018 07:09 AM, Sammy wrote: What exactly is different about a lens in Macro mode? Does the lens alter its optics in some way to focus more closely? My Galaxy S7 lens doesn't seem to have enough space inside to shift any elements in a different way. Although my point and shoot has a lens which comes forward and is made of 6 elements in 5 groups. How do these cameras provide Macro mode? If a camera can provide close up macro focusing then why isn't it provided as part of Normal mode? The simple answer is in order to focus more closely, the lens must be moved farther away from the focal plane (the film or image sensor). This is why, in the "old days", we had bellows units (or extension tubes) that could be fitted between the lens and camera body. A common large format view camera is designed with a bellows and focusing rail that may allow the lens to move away from the film sufficiently to give 1:1 magnification. That's the simple answer, and generally applies to a common single element convex lens. Very few cameras use a single element convex lens- the Holga is a common exception. If you want an exact, specific answer, it will cost you: probably a PhD in physics and light, and in mechanics. See you back here in six to eight years! The cheap and dirty macro method is to get a set of close-up lenses that mount on the front of your camera lens. I get quite reasonable results (good enough for eBay) by holding a +2 close-up lens in front of my point & shoot camera. I get exceptional results by mounting a bellows or extension tubes on my 35mm SLR and using a macro lens. Thanks for the answer. My smartphone camera and my point and shoot don't seem to have any arrangement to move lenses further out or do much anything different. Is Macro mode on such cameras essentially a con because their Normal mode can focus as close as macro mode? How closely a lens can focus depends on its design. It's not unusual for better digital cameras to have lenses with very close-focus capability. Others use digital enlargement to provide "macro" modes that aren't optically macro, but for some the results are often acceptable. -- best regards, Neil |
What exactly is different inside a lens in Macro mode?
On 08/06/2018 12:09, Sammy wrote:
What exactly is different about a lens in Macro mode? Does the lens alter its optics in some way to focus more closely? My Galaxy S7 lens doesn't seem to have enough space inside to shift any elements in a different way. Although my point and shoot has a lens which comes forward and is made of 6 elements in 5 groups. How do these cameras provide Macro mode? If a camera can provide close up macro focusing then why isn't it provided as part of Normal mode? In some cases, it's because it would slow down focussing if the software had to search from a very close macro out to infinity each time to determine the best focus point. In other cases - e.g. a macro lens for a interchangeable lens camera - the lens may be designed to work best when focussing close (have fewer imperfections), and of course it has that closer focussing range. -- Cheers, David Web: http://www.satsignal.eu |
What exactly is different inside a lens in Macro mode?
On 09/06/2018 06:48, David Taylor wrote:
On 08/06/2018 12:09, Sammy wrote: What exactly is different about a lens in Macro mode?Â* Does the lens alter its optics in some way to focus more closely? My Galaxy S7 lens doesn't seem to have enough space inside to shift any elements in a different way.Â* Although my point and shoot has a lens which comes forward and is made of 6 elements in 5 groups.Â* How do these cameras provide Macro mode? If a camera can provide close up macro focusing then why isn't it provided as part of Normal mode? In some cases, it's because it would slow down focussing if the software had to search from a very close macro out to infinity each time to determine the best focus point.Â* In other cases - e.g. a macro lens for a interchangeable lens camera - the lens may be designed to work best when focussing close (have fewer imperfections), and of course it has that closer focussing range. Agreed, also reduces the risk of the camera trying to focus on something between the lens and subject, like wire fencing, window glass, or even raindrops on the front element. I don't know whether my canon compacts also shift an internal element in macro mode, but they certainly do a remarkably good job. --- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus |
What exactly is different inside a lens in Macro mode?
On Sat, 9 Jun 2018 06:48:43 +0100, David Taylor
wrote: On 08/06/2018 12:09, Sammy wrote: What exactly is different about a lens in Macro mode? Does the lens alter its optics in some way to focus more closely? My Galaxy S7 lens doesn't seem to have enough space inside to shift any elements in a different way. Although my point and shoot has a lens which comes forward and is made of 6 elements in 5 groups. How do these cameras provide Macro mode? If a camera can provide close up macro focusing then why isn't it provided as part of Normal mode? In some cases, it's because it would slow down focussing if the software had to search from a very close macro out to infinity each time to determine the best focus point. In other cases - e.g. a macro lens for a interchangeable lens camera - the lens may be designed to work best when focussing close (have fewer imperfections), and of course it has that closer focussing range. My oild Nikon 105mm Macro lens has a switch to limit the focus range to the closer distances. When this is 'off' the camera can spend an extrordinary amount of time focussing in and out without ever finding macro focus. The lens is of the old screw driver drive which is relatively slow. -- Regards, Eric Stevens |
What exactly is different inside a lens in Macro mode?
On 2018-06-08 07:09, Sammy wrote:
What exactly is different about a lens in Macro mode? Does the lens alter its optics in some way to focus more closely? My Galaxy S7 lens doesn't seem to have enough space inside to shift any elements in a different way. Although my point and shoot has a lens which comes forward and is made of 6 elements in 5 groups. How do these cameras provide Macro mode? First off, in the phone, the sensor is so small, that the lens to sensor distance doesn't have to be huge to provide near macro. If a camera can provide close up macro focusing then why isn't it provided as part of Normal mode? The main issue with good macro lenses is relatively simple optics that mechanically move far away from the film plane/sensor. This is why very good lenses can be had in the 80 - 120 mm range that are extensible for fine macro performance. With AF lenses, in the so called normal range, the mechanical movement for infinity down to close (but not macro) range is not all that much. Once you get close in to macro then the mechanical focus range gets very large. So AF is a PITA - why many Macro lenses have AF limiting switches to hold AF in the macro range or outside the macro range. -- "2/3 of Donald Trump's wives were immigrants. Proof that we need immigrants to do jobs that most Americans wouldn't do." - unknown protester |
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