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twinquartz
Joined: 11 Jun 2012
Posts: 316
Location: Sweden
Expire: 2013-10-29
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 Posted: Fri Oct 25, 2013 6:12 pm Post subject: "Close Focus" lenses? |
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twinquartz wrote:
Hi all!
The last few weeks, I have noticed some lenses
marked "Close Focus". In what way do they differ
from macro lenses -- and from ordinary lenses? |
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kds315*
Joined: 12 Mar 2008
Posts: 16661
Location: Weinheim, Germany
Expire: 2021-03-09
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| Posted: Fri Oct 25, 2013 6:17 pm Post subject: |
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kds315* wrote:
per definition "macro" is the 1:1 to 50:1 range, "close up" is up to 1:1
Unfortunately both terms are very loosely used, often interchangeably....
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iangreenhalgh1
Joined: 18 Mar 2011
Posts: 15679
Expire: 2014-01-07
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| Posted: Fri Oct 25, 2013 7:05 pm Post subject: |
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iangreenhalgh1 wrote:
I think with most lenses marked close focus, it just means they have a slightly longer helicoid and therefore can focus to a slightly closer distance.
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drjs
Joined: 25 Feb 2013
Posts: 484
Location: USA
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| Posted: Fri Oct 25, 2013 7:24 pm Post subject: |
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drjs wrote:
It was a marketing ploy often used in the late 80s. Unfortunately, it has nothing to do of being a macro lens or even close to it. There was also no standard on how much closer is deemed close enough for the label. So, take it with a big grain of salt.
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Lloydy
Joined: 02 Sep 2009
Posts: 7795
Location: Ironbridge. UK.
Expire: 2022-01-01
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| Posted: Fri Oct 25, 2013 11:06 pm Post subject: |
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Lloydy wrote:
But still a very useful feature of any lens. It might not give true 1:1 macro, but 'close focus' can give you a shot you might otherwise lose.
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philslizzy
Joined: 07 Aug 2012
Posts: 4745
Location: Cheshire, England
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| Posted: Fri Oct 25, 2013 11:39 pm Post subject: |
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philslizzy wrote:
I was never under any illusion that close focus lenses were macro but an 18inch focusing distance is more useful than a 36 inch distance.
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norland
Joined: 10 Aug 2013
Posts: 165
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| Posted: Sat Oct 26, 2013 12:20 am Post subject: |
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norland wrote:
| philslizzy wrote: |
| I was never under any illusion that close focus lenses were macro but an 18inch focusing distance is more useful than a 36 inch distance. |
It says "macro" on my (current version) 75-300mm Sony autofocus lens .... right next to "4.9ft".
I like it a lot anyway.... Some don't; guess I must have got a good one!  |
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hifisapi
Joined: 25 Sep 2012
Posts: 941
Location: USA
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| Posted: Sat Oct 26, 2013 5:15 am Post subject: |
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hifisapi wrote:
Note- some tamron lenses are marked CF but it doesn't stand for close focus, it stands for continuous focus which means
they go from infinity to mfd continuously without the need for pushing any special buttons or rings.
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Lenses : Pentax M42 = Super Multi Coated Takumars 50/1.4 55/1.8 100/4-BELLOWS 500/4.5 1000/8 135-600/6.7 Pentax PK= SMC Pentax-Ks K17/4-FF Fisheye K18/3.5 K20/4 K24/3.5 K28/3.5 K28/2 K35/3.5 K35/2 K50/1.2 K50/1.4K 50/4-MACROK 55/1.8 K85/1.8 K100/4-MACRO K100/4-BELLOWS K105/2.8 K120/2.8 K135/3.5 K135/2.5 K150/4 K200/4 K400/5.6 K45-125/4K 85-210/4.5 Pentax PKM = SMC Pentax-M M40/2.8-Pancake M50/1.4 M75-150/4 M80-200/4.5 Pentax PKA= SMC Pentax-A A15/3.5 A50/2.8-MACRO A28/2 A35/2 A50/1.4 A135/2.8 A200/4 A*300/4 A35-105/3.5 A24-50/4 A70-210/4 TAMRON AD2= SP80-200/2.8 SP180/2.5 TOKINA AT-X PK= ATX28-85/3.5-4.5 ATX35-70/2.8 ATX60-120/2.8 ATX80-200/2.8 ATX100-300/4 ATX90/2.5 MACRO KIRON-LESTER DINE PK = 105/2.8-MACRO VIVITAR PK = 135/2.8-MACRO 28-85/4 NOFLEXAR AUTOBELLOWS PK = 60/4 105/4 |
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hifisapi
Joined: 25 Sep 2012
Posts: 941
Location: USA
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| Posted: Sat Oct 26, 2013 5:16 am Post subject: |
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hifisapi wrote:
My experience is that in general, lenses marked close focus, focus closer than usual but not as close as macro lenses.
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ACQUIRED OVER 30 YEARS:
Cameras: DSLR=Pentax istDS FILM=Pentax SP, SP-F, ESII, SP1000, KX, K2
Lenses : Pentax M42 = Super Multi Coated Takumars 50/1.4 55/1.8 100/4-BELLOWS 500/4.5 1000/8 135-600/6.7 Pentax PK= SMC Pentax-Ks K17/4-FF Fisheye K18/3.5 K20/4 K24/3.5 K28/3.5 K28/2 K35/3.5 K35/2 K50/1.2 K50/1.4K 50/4-MACROK 55/1.8 K85/1.8 K100/4-MACRO K100/4-BELLOWS K105/2.8 K120/2.8 K135/3.5 K135/2.5 K150/4 K200/4 K400/5.6 K45-125/4K 85-210/4.5 Pentax PKM = SMC Pentax-M M40/2.8-Pancake M50/1.4 M75-150/4 M80-200/4.5 Pentax PKA= SMC Pentax-A A15/3.5 A50/2.8-MACRO A28/2 A35/2 A50/1.4 A135/2.8 A200/4 A*300/4 A35-105/3.5 A24-50/4 A70-210/4 TAMRON AD2= SP80-200/2.8 SP180/2.5 TOKINA AT-X PK= ATX28-85/3.5-4.5 ATX35-70/2.8 ATX60-120/2.8 ATX80-200/2.8 ATX100-300/4 ATX90/2.5 MACRO KIRON-LESTER DINE PK = 105/2.8-MACRO VIVITAR PK = 135/2.8-MACRO 28-85/4 NOFLEXAR AUTOBELLOWS PK = 60/4 105/4 |
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Laurentiu Cristofor
Joined: 23 Oct 2010
Posts: 524
Location: WA, USA
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| Posted: Sat Oct 26, 2013 8:39 am Post subject: Re: "Close Focus" lenses? |
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Laurentiu Cristofor wrote:
| twinquartz wrote: |
Hi all!
The last few weeks, I have noticed some lenses
marked "Close Focus". In what way do they differ
from macro lenses -- and from ordinary lenses? |
Macro lenses have two characteristics: flat focal plane and high magnification - 1:2 or higher. They are also optimized for close focusing distances. It is not just the magnification that makes them macro.
Close Focus lenses or zooms marked macro are just lenses that can focus close - usually from 1:4 to 1:2. They are not optimized for close focusing distances so they will exhibit more spherical aberrations than a macro lens (impacting sharpness). And they also will not have a flat focal plane, which means that if you photograph a flat subject and focus in the center, the borders will be out of focus.
Ordinary lenses don't focus closer than 1:4.
Close focusing and a flat focal plane require better optical designs. That is why macro lenses tend to be more expensive than ordinary lenses with similar focal length/aperture.
Finally, the magnification refers to the size of the physical image produced in the focal plane and is determined independent to sensor size. 1:1 means that the image is as large as the subject. 1:2 means it's half the size and 2:1 would mean it's twice as large. So if you use a 1:1 lens on FF and on APS-C, you will fill the frame more with a subject at a given distance on APS-C.
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Basilisk
Joined: 21 Mar 2013
Posts: 356
Location: UK
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| Posted: Sat Oct 26, 2013 9:35 am Post subject: |
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Basilisk wrote:
A couple of my lenses have turned out surprisingly useful in this department - CZJ Flektogon 35mm f2.4 and the Tamron 500mm f8 mirror lens (55BB). While not true macro, such lenses can go as close as you might need for hand-held close up. |
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