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hifisapi
Joined: 25 Sep 2012
Posts: 941
Location: USA
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 Posted: Fri Aug 30, 2013 10:49 pm Post subject: SMC Pentax-A 20mm F2.8 on APS-C |
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hifisapi wrote:
These were taken in partly cloudy skies but show little flare or distortion. sharpness is good but not fantastic.
shadow detail is excellent.
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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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mzzyhmd
Joined: 01 Jul 2013
Posts: 99
Location: Florida
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| Posted: Sat Aug 31, 2013 7:33 am Post subject: |
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mzzyhmd wrote:
the first one is really good!
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Nex 6: Sony 16/2.8|| Vivitar Komine 24/2|| Sigma 30/2.8|| Rokinon 35/1.4|| Jupiter 8||Helios 53/1.8|| Minolta Rokkor PF 55/1.7|| CZJ Pancolar 50/1.8||Steinheil 85/2.8||Leica Elmar 90/4||Meyer Orestor 135/2.8||Tair 133/2.8 |
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hifisapi
Joined: 25 Sep 2012
Posts: 941
Location: USA
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| Posted: Sat Aug 31, 2013 8:24 pm Post subject: |
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hifisapi wrote:
| mzzyhmd wrote: |
| the first one is really good! |
yeah, I like that one too, but I think I would like it even better with a wider lens lens like a 15mm!
_________________
===========
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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Attila
Joined: 24 Feb 2007
Posts: 57865
Location: Hungary
Expire: 2025-11-18
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| Posted: Sat Aug 31, 2013 8:52 pm Post subject: |
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Attila wrote:
I like them a lot , great lens, nice presentation.
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iangreenhalgh1
Joined: 18 Mar 2011
Posts: 15679
Expire: 2014-01-07
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| Posted: Sat Aug 31, 2013 9:51 pm Post subject: |
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iangreenhalgh1 wrote:
| hifisapi wrote: |
| mzzyhmd wrote: |
| the first one is really good! |
yeah, I like that one too, but I think I would like it even better with a wider lens lens like a 15mm! |
I like the first one too. You could get a wider view by stitching some frames together, like I did here with a 50mm lens, I think this one was 8 frames stitched, with the 20mm, you could probably do it with 3 or 4.
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I don't care who designed it, who made it or what country it comes from - I just enjoy using it! |
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hifisapi
Joined: 25 Sep 2012
Posts: 941
Location: USA
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| Posted: Sun Sep 01, 2013 12:30 am Post subject: |
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hifisapi wrote:
| iangreenhalgh1 wrote: |
| hifisapi wrote: |
| mzzyhmd wrote: |
| the first one is really good! |
yeah, I like that one too, but I think I would like it even better with a wider lens lens like a 15mm! |
I like the first one too. You could get a wider view by stitching some frames together, like I did here with a 50mm lens, I think this one was 8 frames stitched, with the 20mm, you could probably do it with 3 or 4.
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Because you didn't have a true wide angle lens, you have converging vericals, but nothing that couldn't be fixed with photoshop perspective control
_________________
===========
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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iangreenhalgh1
Joined: 18 Mar 2011
Posts: 15679
Expire: 2014-01-07
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| Posted: Sun Sep 01, 2013 12:53 am Post subject: |
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iangreenhalgh1 wrote:
You get converging verticals with a wide angle lens too, if it is angled upwards, as was the case with my shot - the camera was placed low down, looking upwards slightly.
To correct the perspective so it is completely flat would make it look less natural, the verticals converge to a vanishing point, which is how the eye sees it too.
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I don't care who designed it, who made it or what country it comes from - I just enjoy using it! |
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hifisapi
Joined: 25 Sep 2012
Posts: 941
Location: USA
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| Posted: Sun Sep 08, 2013 8:44 am Post subject: |
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hifisapi wrote:
heres another taken in better light which yielded a faster shutter speed so its sharper. Contrast is execellent with this lens too.
_________________
===========
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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