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dream100cc
Joined: 27 Apr 2014
Posts: 39
Location: Vietnam
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 Posted: Thu May 01, 2014 3:28 pm Post subject: Pentax-M 50mm 1:1.7 Coating problem? |
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dream100cc wrote:
Hi guys, I plan to purchase a prime lens Pentax-M 50mm f1:1.7. But when I received a photo of this lens from the seller, I recognized its coating had a problem. I'm not a native speaker, so I can't explain which the problem is. The seller told me that a scratch (or "cleaning mark", I think so), and it doesn't effect image quality. So please look at the picture below and give your opinion to this problem. I'm very appreciate with your responses. 
p/s: plz notice the red circle
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iangreenhalgh1
Joined: 18 Mar 2011
Posts: 15685
Expire: 2014-01-07
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| Posted: Thu May 01, 2014 3:56 pm Post subject: |
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iangreenhalgh1 wrote:
I don't see any problem at all.
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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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dream100cc
Joined: 27 Apr 2014
Posts: 39
Location: Vietnam
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| Posted: Thu May 01, 2014 4:09 pm Post subject: |
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dream100cc wrote:
Thanks for your reply. I think I am a precisian. So I always pay attention to anything even if it's just a small dust speck . In the fourth pic of those, I see a small area which seems like oil spreading on the sea (I think so, cause I don't know how to describe it in English).
I offered the seller to take some pics of this problem. So, I'll post them as soon as possible. |
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ForenSeil
Joined: 15 Apr 2011
Posts: 2726
Location: Kiel, Germany.
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| Posted: Thu May 01, 2014 4:26 pm Post subject: |
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ForenSeil wrote:
| dream100cc wrote: |
Thanks for your reply. I think I am a precisian. So I always pay attention to anything even if it's just a small dust speck . In the fourth pic of those, I see a small area which seems like oil spreading on the sea (I think so, cause I don't know how to describe it in English).
I offered the seller to take some pics of this problem. So, I'll post them as soon as possible. |
I guess slight seperation issue maybe. Could you make a larger pic maybe?
_________________
I'm not a collector, I'm a tester 
My camera: Sony A7+Zeiss Sonnar 55/1.8
Current favourite lenses (I have many more):
A few macro-Tominons, Samyang 12/2.8, Noritsu 50.7/9.5, Rodagon 105/5.6 on bellows, Samyang 135/2, Nikon ED 180/2.8, Leitz Elmar-R 250/4, Celestron C8 2000mm F10
Most wanted: Samyang 24/1.4, Samyang 35/1.4, Nikon 200/2 ED
My Blog: http://picturechemistry.own-blog.com/
(German language) |
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calvin83
Joined: 12 Apr 2009
Posts: 7554
Location: Hong Kong
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| Posted: Thu May 01, 2014 4:40 pm Post subject: |
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calvin83 wrote:
A local guru told me he stay away from Pentax-M lenses because many of them suffered from separation issues. 
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https://lensfever.com/
https://www.instagram.com/_lens_fever/
The best lens is the one you have with you. |
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dream100cc
Joined: 27 Apr 2014
Posts: 39
Location: Vietnam
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| Posted: Thu May 01, 2014 4:41 pm Post subject: |
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dream100cc wrote:
You mean "separation"? Sorry for the size of photo, because I have not owned the lens yet, so I cant take the picture accurately. But I offered the seller do that. I'll post a larger picture as soon as possible and hope you give me more advices. Thank you so much! |
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dream100cc
Joined: 27 Apr 2014
Posts: 39
Location: Vietnam
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| Posted: Thu May 01, 2014 4:49 pm Post subject: |
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dream100cc wrote:
I'm really happy when receiving your quickly replies. This is the first time I get the information of separation issues. So can you explain this problem for me? I'm a newbie, and certainly your recommends always are the helpful knowledge for me. |
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Lightshow
Joined: 04 Nov 2011
Posts: 3669
Location: Calgary
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| Posted: Thu May 01, 2014 7:57 pm Post subject: |
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Lightshow wrote:
Looks like a scratch to me.
_________________
A Manual Focus Junky...
One photographers junk lens is an artists favorite tool.
My lens list
http://www.flickr.com/photos/lightshow-photography/ |
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tromboads
Joined: 29 May 2012
Posts: 1782
Location: Melbourne AU
Expire: 2015-10-01
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| Posted: Fri May 02, 2014 8:42 am Post subject: |
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tromboads wrote:
Did you pay much for it? If not great, you have a walk around in the rain lens! xD |
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dream100cc
Joined: 27 Apr 2014
Posts: 39
Location: Vietnam
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| Posted: Fri May 02, 2014 12:19 pm Post subject: |
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dream100cc wrote:
Hi guys, I just have received some pics from the seller. Please pay your attention to the "point" below the aperture 1:1.7 in #1. The seller told that the front glass of this lens is free of scratch except this one. This lens costs me about $33. In my country, it's quite cheap. So please tell that lens is fine or maybe I should leave it behind and find another. Thanks all!
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tromboads
Joined: 29 May 2012
Posts: 1782
Location: Melbourne AU
Expire: 2015-10-01
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| Posted: Fri May 02, 2014 12:23 pm Post subject: |
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tromboads wrote:
Dude... you are measuring a bees dick. At the end it's still tiny. i.e. Sif you'd waste your time being worried about that!
Go and create stuff with it already! |
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Langstrum
Joined: 16 Feb 2014
Posts: 351
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| Posted: Fri May 02, 2014 1:43 pm Post subject: |
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Langstrum wrote:
With this appearance, I would take this lens right away with just $33. I have 2 of this lens and they're really good, even one has a big scratch in the center of the lens, it's even better than the one that looks good. If you go for image quality, the tiny problems you're concerning really don't matter at all.
_________________
Camera: Sony A7 mark III, A6300
AF Lenses:
Canon EF 50/1.8; EF 200/2.8 L, EF 200/1.8 L, EF 300/4 L Sony E mount SEL 50/1.8 OSS, SEL 16/2.8 Fuji X mount XF 35/1.4 R
MF Lenses: Peleng MC 8/3.5, 17/2.8 Samyang 14/T3.1, 35/T1.5, TS 24/3.5 ED, 85/T1.5, Polar 85/1.4 Auto Revuenon 28/2.8; MC 50/1.4 Vega11U 50/2.8 Carl Zeiss Tessar 50/2.8 (exakta mount) Auto Chinon 50/1.9 Zenitar ME1 50/1.7 Sears Auto Sears 55/1.4; Sears 135/2.8 Auto Yashinon DX 50/1.4; Tomioka 50/1.2 SMC Pentax 50/1.7; 50/1.4 Canon FD 50/1.4 S.S.C; 55/1.2 S.S.C; FD 50/1.2 L; FD 85/1.2 L; 85/1.2 S.S.C Aspherical; FD 80-200/4 L 300/2.8 S.S.C Fluorite FD 300/2.8 L FD 200/1.8 LCosina-S 50/1.2 Helios Helios 44 Chrome f/22, 44-2, 44-3, 44M-4, 44M-7 (58/2), Helios-40 85/1.5 Jupiter Jupiter-9 85/2; Jupiter-37A 135/3.5; Jupiter-21M 200/4 Nikon Ai 105/2.5 Tairs-3S 300/4.5
Voigtlander 15/4.5 Aspherical; Ultron 35/1.7
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dream100cc
Joined: 27 Apr 2014
Posts: 39
Location: Vietnam
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| Posted: Fri May 02, 2014 2:41 pm Post subject: |
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dream100cc wrote:
@tromboads: Thanks for your straight reply. In fact, I don't know why I always notice a small thing like this. Anyway, I will purchase this lens .
@Langstrum: $35 include shipping fees. |
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Langstrum
Joined: 16 Feb 2014
Posts: 351
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| Posted: Fri May 02, 2014 2:52 pm Post subject: |
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Langstrum wrote:
| dream100cc wrote: |
@tromboads: Thanks for your straight reply. In fact, I don't know why I always notice a small thing like this. Anyway, I will purchase this lens .
@Langstrum: $35 include shipping fees. |
One I bought for $29 and one I bought for $30 with full of fungus, but cleaning this lens is very easy. Since I bought them locally, they cost the same as yours and I don't think it can be lower. Concerning the image quality and price it's hard to beat this lens. It's sharp wide open, even sharper than the SMC Pentax 50/1.4, and the bokeh looks smooth enough. It may be on par with Chinon and Yashica 50/1.7 but cheaper and easier to find.
_________________
Camera: Sony A7 mark III, A6300
AF Lenses:
Canon EF 50/1.8; EF 200/2.8 L, EF 200/1.8 L, EF 300/4 L Sony E mount SEL 50/1.8 OSS, SEL 16/2.8 Fuji X mount XF 35/1.4 R
MF Lenses: Peleng MC 8/3.5, 17/2.8 Samyang 14/T3.1, 35/T1.5, TS 24/3.5 ED, 85/T1.5, Polar 85/1.4 Auto Revuenon 28/2.8; MC 50/1.4 Vega11U 50/2.8 Carl Zeiss Tessar 50/2.8 (exakta mount) Auto Chinon 50/1.9 Zenitar ME1 50/1.7 Sears Auto Sears 55/1.4; Sears 135/2.8 Auto Yashinon DX 50/1.4; Tomioka 50/1.2 SMC Pentax 50/1.7; 50/1.4 Canon FD 50/1.4 S.S.C; 55/1.2 S.S.C; FD 50/1.2 L; FD 85/1.2 L; 85/1.2 S.S.C Aspherical; FD 80-200/4 L 300/2.8 S.S.C Fluorite FD 300/2.8 L FD 200/1.8 LCosina-S 50/1.2 Helios Helios 44 Chrome f/22, 44-2, 44-3, 44M-4, 44M-7 (58/2), Helios-40 85/1.5 Jupiter Jupiter-9 85/2; Jupiter-37A 135/3.5; Jupiter-21M 200/4 Nikon Ai 105/2.5 Tairs-3S 300/4.5
Voigtlander 15/4.5 Aspherical; Ultron 35/1.7
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dream100cc
Joined: 27 Apr 2014
Posts: 39
Location: Vietnam
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| Posted: Fri May 02, 2014 4:09 pm Post subject: |
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dream100cc wrote:
This lens had been cleaned before. So we can see its glass in very good condition. There are many photographers take picture by this lens in my country and this is the reason why I decide to buy this one.
I just have one more recommend about SMC Pentax-A 50mm f/2. Of course, it only costs about $25. So, how far its good compare to the SMC Pentax-M 50mm f/1.7?
I've read some reviews and know that the Pentax 50mm f/2 is soft wide open. It seems not to be my favorite lens, hahaha . |
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scsambrook
Joined: 29 Mar 2009
Posts: 2167
Location: Glasgow Scotland
Expire: 2011-11-18
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| Posted: Sat May 03, 2014 4:58 pm Post subject: |
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scsambrook wrote:
I have a 50/2 SMC-A and I rather like it. This lens is often dismissed as 'inferior' but I wonder just what its critics are comparing it to . . . Prices are still very low and I'd certainly suggest you buy and try it out in order to form your own conclusions.
_________________
Stephen
Equipment: Pentax DSLR for casual shooting, Lumix G1 and Fuji XE-1 for playing with old lenses, and Leica M8 because I still like the optical rangefinder system. |
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hifisapi
Joined: 25 Sep 2012
Posts: 941
Location: USA
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| Posted: Sat May 03, 2014 6:36 pm Post subject: |
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hifisapi wrote:
| scsambrook wrote: |
| I have a 50/2 SMC-A and I rather like it. This lens is often dismissed as 'inferior' but I wonder just what its critics are comparing it to . . . Prices are still very low and I'd certainly suggest you buy and try it out in order to form your own conclusions. |
The SMC Pentax-A 50mm F2.0 lens is a decent performer but its a cheaply constructed plastic entry level lens that cant compare to the F1.4 model in performance or build.
_________________
===========
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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Dogtag
Joined: 27 Jul 2013
Posts: 166
Location: Holland del norte
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| Posted: Sun May 04, 2014 4:40 pm Post subject: |
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Dogtag wrote:
| dream100cc wrote: |
Hi guys, I just have received some pics from the seller. Please pay your attention to the "point" below the aperture 1:1.7 in #1. The seller told that the front glass of this lens is free of scratch except this one. This lens costs me about $33. In my country, it's quite cheap. So please tell that lens is fine or maybe I should leave it behind and find another. Thanks all!
[/url] |
33$ is a lot of money for many in your country I still have a couple 100.000 dong lying around somewhere 
_________________
Konica AR fan
Konica AR, 135/2.5 135/3.2 135/3.5 100/2.8 85/1.8 55/3.5-macro 57/1.2 57/1.4 50/1.4 52/1.8 50/1.7(3x) 40/1.8 35/2.8 35/2 28/1.8 24/2.8
Missing UC 15mm and 21mm |
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