snubbr.com

Are macro lenses only intended for use on close subjects?
Are macro lenses only good for getting those close-up shots? Or, are they great at the close-up shots, but still good at landscape and such as well?..

Comments (8)

Joshpa1980 wrote:.

Are macro lenses only good for getting those close-up shots? Or, arethey great at the close-up shots, but still good at landscape andsuch as well?.

Think of it a different way. "Near field" (closer than the normal minimum object distance of similar lenses) and "far field" (toward infinity)..

Macro lenses WILL operate in BOTH near field and far field situation. Usually, they are sharper in far field than many other lenses intended only for use there normally..

However, "landcapes" implys to many of us wide horizontal possibilites ands you may be thinking of that with your question. Since macros tend to be either normal or telephoto in focal length design, they are often used for portraiture and sometimes sports. Certainly, some far field landscapes would work fine, too.Van..

Comment #1

Sometime you can't focus to infinity, like with the Canon MP-E lens or using extension tubes on your lens..

Other than that, macro lenses are just like any other lens..

Comment #2

So would this lens be better than the 18-55 Pentax kit lens in every way? (not just better at macro shots?).

Sigma 17 - 70mm f/2.8-4.5 DC Macro AutoFocus Wide Angle Zoom Lens for Pentax AF Cameras.

Http://www.adorama.com/SG1770PXAF.html..

Comment #3

One more question....

My Pentax 18-55mm kit lens has a minimum focus distance of .82 ft, is the main advantage of a macro lens that it can get in closer? Or, will it produce a better image than my kit lens even at .82 ft?..

Comment #4

Joshpa1980 wrote:.

So would this lens be better than the 18-55 Pentax kit lens in everyway? (not just better at macro shots?).

Sigma 17 - 70mm f/2.8-4.5 DC Macro AutoFocus Wide Angle Zoom Lens forPentax AF Cameras.

Two different kinds of lenses are labelled 'macro'..

True macro lenses are (I can't think of any exception) prime lenses - that is to say, single focal length. To be worthy of the name they must focus close enough to achieve 1:1 macro, which means the image on the film/sensor is the same size as the subject. Macro lenses are typically very high performance lenses, but mostly this is because they are high quality prime lenses - it is not specifically a macro lens characteristic as such..

Then, there is a class of zoom lenses which focus somewhat closer than an ordinary lens. They are not true macro lenses, mostly achieving around 1:3 but sometimes better. A number of Sigma's lenses are in this class - they seem to have become very good at designing them..

I can't answer your question insofar as I don't know anything about the Pentax kit lens. But the Sigma 17-70 is a very good general-purpose lens with a useful close-up feature as a bonus. I would think it is very likely "better than the 18-55 Pentax kit lens in every way"...

Comment #5

Steve Balcombe wrote:.

Joshpa1980 wrote:.

So would this lens be better than the 18-55 Pentax kit lens in everyway? (not just better at macro shots?).

Sigma 17 - 70mm f/2.8-4.5 DC Macro AutoFocus Wide Angle Zoom Lens forPentax AF Cameras.

I can't answer your question insofar as I don't know anything aboutthe Pentax kit lens. But the Sigma 17-70 is a very goodgeneral-purpose lens with a useful close-up feature as a bonus. Iwould think it is very likely "better than the 18-55 Pentax kit lensin every way"..

The 17-70 is a better lens overall than the Pentax kit lens. It has a better ranges and is an overall sharper lens with a brighter image and larger aperture. I own both and the Sigma is my lens of choice for everyday use except where weight and size is a concern....then it is the Pentax kit lens on the *istD body. .

The Sigma is also kind of in a limbo between a macro and a close focusing lens. The Sigma gives you a 1:2.3 close focus setting whic is very close to the 1:2 ratio most consider the start of a "true" macro range......the Sigma will give you almost one half life sized capability, which is what some dedicated macro prime lens will give. So, in terms of macro, the Sigma 17-70 is one of the better "macro" zoom out there..

Another contender, whixch is also very good but a very different perspective, is the Tamron 70-300LD Macro. This lens gives a 1:2 (half life size) macro capbility at the telephoto end, 180mm to 300mm focal length. So, the Tamron will give you better macro capability without duplication of the focal length range you would get with the kit lens..

As far as kit lens go, the Pentax is probably the best of the bunch out in terms of overall performance and build quality, when compared against similar lenses from Canon or Nikon. It is not a bad lens at all and for the price, it is an excellent buy. The Tamron 70-300 will run you around $180 new, while the Sigma 17-70 will be in the $350 range. As you already own the kit lens, the Tamron may be a better choice as it will allow to experiment not only with macro but also to have a very good and reasonably priced telezoom..

JohnPentax *ist-D, K100D, Fuji F20/31fd, Oly Stylushttp://www.pbase.com/jglover..

Comment #6

In general, a ZOOM lens that has 'macro' in it's title means it will focus up pretty close as opposed to a 'normal' zoom that won't focus closer than, say, 2 to 4 feet (or more) depending on the focal length and manufacturer. Keep in mind that 'macro' has nothing to do with focal length..

How close a lens can focus without the aid of closeup filters or extension tubes is solely a matter of the design: how far can the barrel move outwards? Extension tubes extend that distance when the lens itself can't..

A PRIME (fixed focal length, e.g., 100mm) macro lens has two advantages: it's focus barrel is made to extend way out, usually to where it'll get a 1:1 ratio of subject to image on film or card . It is also a high quality lens, so pics taken at ANY distance are bound to be better, optically, than with a zoom, certainly than with a consumer zoom. The disadvantage of a prime lens is that it is set at one focal length. So you have to move your body instead of adjusting a zoom lens's focal length to compose the shot..

One last point: a rule of thumb is that it's difficult to make an optically fine zoom lens with more than a 3X ratio, something like 17-55 or 70-200. I'm sure as mfr's improve their technology that rule of thumb will (or is) breaking down. So a zoom with 5x or higher ratio, though very convenient as a walk-around lens, probably gives up something opticallay in exchange for that convenience.Mike D.http://www.mikedphoto.smugmug.com..

Comment #7

John Glover wrote:.

... the 1:2 ratio most consider the start of a "true"macro range....

I must beg to differ on that - macro means 1:1 or better. I can think of only one lens which claims to be a true macro lens and can only achieve 1:2, and that's the old 50mm Canon without it's 'life size' adapter. But Canon called it their "Compact Macro" - and it is my belief that they did this because they wanted to differentiate it from their true macro lenses. And with the optional adapter it too is 1:1..

Of course, there is nothing magical about 1:1, and some of the zoom macro lenses are very good...

Comment #8

Click Here to View All...

Sponsored Amazon Deals:

1. Get big savings on Amazon warehouse deals.
2. Save up to 70% on Amazon Products.


This question was taken from a support group/message board and re-posted here so others can learn from it.

 

Categories: Home | Diet & Weight Management | Vitamins & Supplements | Herbs & Cleansing |

Sexual Health | Medifast Support | Nutrisystem Support | Medifast Questions |

Web Hosting | Web Hosts | Website Hosting | Hosting |

Web Hosting | GoDaddy | Digital Cameras | Best WebHosts |

Web Hosting FAQ | Web Hosts FAQ | Hosting FAQ | Hosting Group |

Hosting Questions | Camera Tips | Best Cameras To Buy | Best Cameras This Year |

Camera Q-A | Digital Cameras Q-A | Camera Forum | Nov 2010 - Cameras |

Oct 2010 - Cameras | Oct 2010 - DSLRs | Oct 2010 - Camera Tips | Sep 2010 - Cameras |

Sep 2010 - DSLRS | Sep 2010 - Camera Tips | Aug 2010 - Cameras | Aug 2010 - DSLR Tips |

Aug 2010 - Camera Tips | July 2010 - Cameras | July 2010 - Nikon Cameras | July 2010 - Canon Cameras |

July 2010 - Pentax Cameras | Medifast Recipes | Medifast Recipes Tips | Medifast Recipes Strategies |

Medifast Recipes Experiences | Medifast Recipes Group | Medifast Recipes Forum | Medifast Support Strategies |

Medifast Support Experiences |

 

(C) Copyright 2010 All rights reserved.