Fresh Dew on a Rose

by adarsha joisa

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2

You could reverse stack two lenses, which can give you an effective lens length of 2000mm (that's the right number of zeros) or more.I recently did this with the only two lenses I have - a 55-250 mounted on the camera, and a 18-55 reverse mounted onto that: The trade of with using this method is that the focusing plane of the finished setup will be ...


0

Pentax had a helical extension tube. It is dumb, but it allows changing the tube's length by simply twisting the ring. One can vary the magnification, & if using a zoom, by altering focal length, can refocus. I bought one MANY moons ago & for me it's been quite useful.


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For the reason TFuto noted, that the in-focus region is actually a sphere "touching" the center point of your plane, it is best to use a lens with a rather large focal distance, and shoot from farther away. This will increase the radius of that sphere, which means the difference between center and corner won't be as big. Of course, it should still be a lens ...


1

Your observation is correct. However, all lens shows this effect, but to a different degree. I suggest checking out e.g. this lens comparison tool. You will see the actual behavior of different lenses. For better understanding, you should learn to read and use MTF charts. A very good explanation (with examples for the Canon 50 mm f/1.4 !) can be found ...


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Here is an example from dxomark: you can look at details for specific lens and camera, and how it performs at different apetures.


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I am not familiar with any app of that sort, but it might help you to consider Macro Photography as an optical capability (i.e. phone hardware) rather than a software one. It all depends on the initial capabilities and characteristics of your phone's camera. Often do mobile phones manufacturers just specify the camera's resolution, that is - how large and ...


4

These lenses work basically like a magnifying glass (or reading glasses) in front of the lens. In fact, not just basically — actually exactly. That has the effect of decreasing the distance from the back of the lens to where an in-focus image is formed, which gives the lens more freedom to focus more closely. And focusing more closely is inherently all ...


3

Because most smartphones without an additional external macro lens do not have optical systems capable of taking photos at close enough minimum focal distances to produce macro photographs. Even if you define macro as the equivalent magnification needed for the tiny sensors found in most phones to produce a print comparable to one made when the image of a ...


0

I started with the 35mm 1.8. I bought the 40mm as an inexpensive toe in the water of macro. My interests are the natural world, not documents or staged items. I'm pretty happy with it. I discovered, pretty much by accident, that it shoots a nice portrait when there's plenty of light. The bokeh is attractive. I also have the 35mm, which I use for the ...


0

I don't think you want either of these lenses for your stated purposes of macro and portrait . They'll work, but not necessarily be most ideal. (As dpollitt also notes, see Is a macro lens suitable for distant subjects - wildlife, sports, portraiture?.) First, normal and wider macro lenses are used for document reproduction, but not usually for the kind of ...


2

There is a lot going on here with many questions you have asked. The main question I believe you are asking is, can you use a macro lens for portrait photography? We already have at least two questions on this site that address that: Should I use a 100mm Macro lens as a portrait lens? Is a macro lens suitable for distant subjects - wildlife, sports, ...


2

I think I get what you are asking - we can assume the sensor limits resolution, and if we know magnification of the system we can then relate this to an object space resolution limit. Your approach is going in the right direction, but you should use the rayleigh criterion as the definition of resolution on the sensor (this assumes diffraction limit. ...



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