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Pancolart
Joined: 04 Feb 2008
Posts: 3693
Location: Slovenia, EU
Expire: 2013-11-18
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 Posted: Tue Jul 20, 2010 2:34 pm Post subject: |
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Pancolart wrote:
Thank you guys but we really need a senior member's test (i mean someone with at least 100 posts)  .
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Spotmatic
Joined: 18 Aug 2008
Posts: 4045
Location: Netherlands
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| Posted: Tue Jul 20, 2010 2:42 pm Post subject: |
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Spotmatic wrote:
I would love to try it out, but where to find one...? 
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Pentax K-5 + Pentax 645 + Canon 5D + Bessa RF 10,5cm Heliar, and a 'little' bag full of MF lenses. The lens list is * here *.
My fast 80s: Asahi-Kogaku Takumar 83mm f/1.9 - Super-Takumar 85mm f/1.9 - FA 77mm f/1.8 Limited - Cyclop 85/1.5 (Helios-40 innards) - Komura 80mm f/1.8 - Meyer Görlitz Primoplan 7,5cm 1:1.9 - Carl Zeiss Jena 80mm f/1.8 Pancolar - Canon 85mm f/1.8 S.S.C. - Canon 85mm f/1.2 S.S.C. Aspherical |
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Attila
Joined: 24 Feb 2007
Posts: 57849
Location: Hungary
Expire: 2025-11-18
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| Posted: Tue Jul 20, 2010 2:45 pm Post subject: |
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Attila wrote:
Welcome Romil! Nice to see you here!
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Items on sale on Ebay
Sony NEX-7 Carl Zeiss Planar 85mm f1.4, Minolta MD 35mm f1.8, Konica 135mm f2.5, Minolta MD 50mm f1.2, Minolta MD 250mm f5.6, Carl Zeiss Sonnar 180mm f2.8
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aoleg
Joined: 22 Feb 2008
Posts: 1389
Location: Berlin, DE
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| Posted: Wed Jul 21, 2010 3:54 am Post subject: |
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aoleg wrote:
| Romil wrote: |
The lens is designed by computer softwares. The Optical part looks the same with Carl Zeiss Sonnar T* 85/2. I use the lens about 4 months, it's very sharp, even at F2.8.
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The optical design of this Mitakon is a symmetric 6/6, so it's a double-Gauss, or Planar equivalent. Sonnars are highly asymmetric, and the particular Sonnar 85/2 was a triplet derivative with just three lens groups.
Now, I wonder why the designers chose the 6/6 formula. It is used for normal lenses more often than for short teles. If I recall it correctly, the designers of Nikkor-H 85/1.8 went similar route, but used two cemented groups to keep flare under control (single coating were the norm then):
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Pancolart
Joined: 04 Feb 2008
Posts: 3693
Location: Slovenia, EU
Expire: 2013-11-18
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| Posted: Wed Jul 21, 2010 7:48 am Post subject: |
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Pancolart wrote:
Aoleg please make some wide-open shots.
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Romil
Joined: 19 Jul 2010
Posts: 10
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| Posted: Wed Jul 21, 2010 3:22 pm Post subject: |
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Romil wrote:
Sorry, I'm not good at English, but I gonna try my best.
the optical part looks the same with Carl Zeiss Sonnar T* 85/2, 6/6 formula. I post a picture to show how the formula looks like.
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Romil
Joined: 19 Jul 2010
Posts: 10
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| Posted: Wed Jul 21, 2010 3:40 pm Post subject: |
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Romil wrote:
the formula on the box is a kind of graphic design, it's not the formula of this lens.
Designers say that cemented groups may cause some problems. for this lens, flare are under control becouse of the multi coatings.
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aoleg
Joined: 22 Feb 2008
Posts: 1389
Location: Berlin, DE
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| Posted: Thu Jul 22, 2010 12:47 am Post subject: |
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aoleg wrote:
| Romil wrote: |
Sorry, I'm not good at English, but I gonna try my best.
the optical part looks the same with Carl Zeiss Sonnar T* 85/2, 6/6 formula. I post a picture to show how the formula looks like.
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I see what you mean. This "Sonnar" is actually double-Gouss, or Planar design. The "Sonnar" part is just a trademark, which is misused here I believe. Thus the Mitakon lens is actually a classic double-Gauss, Planar type design.
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jren
Joined: 25 Jul 2010
Posts: 1
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| Posted: Sun Jul 25, 2010 3:07 pm Post subject: |
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jren wrote:
i did a brief 100% crop comparison of 3 lenses.
100% crop Helios 44-2
100% crop Mitakon 85mm F2
100% crop Tamron 17-50mm F2.8
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calvin83
Joined: 12 Apr 2009
Posts: 7554
Location: Hong Kong
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| Posted: Sun Jul 25, 2010 3:37 pm Post subject: |
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calvin83 wrote:
| jren wrote: |
i did a brief 100% crop comparison of 3 lenses.
100% crop Helios 44-2
100% crop Mitakon 85mm F2
100% crop Tamron 17-50mm F2.8
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Welcome! Thanks you for your comparison.
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8310
Joined: 05 Jun 2010
Posts: 123
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| Posted: Sun Jul 25, 2010 10:09 pm Post subject: |
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8310 wrote:
I guess it is only PK-mount for Pentax, not PK-A? |
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woodrim
Joined: 14 Jan 2010
Posts: 4060
Location: Charleston
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| Posted: Mon Jul 26, 2010 12:42 am Post subject: |
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woodrim wrote:
aoleg: Have you had time to take some test shots? It seems to me that the Jupiter 9 is a good lens to compare with at price point and f/2.
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aoleg
Joined: 22 Feb 2008
Posts: 1389
Location: Berlin, DE
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| Posted: Mon Jul 26, 2010 2:42 am Post subject: |
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aoleg wrote:
| woodrim wrote: |
| aoleg: Have you had time to take some test shots? It seems to me that the Jupiter 9 is a good lens to compare with at price point and f/2. |
Didn't go out with it yet, can only post a few test (meaning: test) shots. Click for larger size. 2nd image demonstrates field curvature. All three taken wide open. It's still evident that the lens is quite soft wide open, but has nice contrast and colors (and huge field curvature).
Compared to Jupiter-9, the Jupiter retains more fine detail wide open (meaning higher spatial resolution), while the Mitakon has much higher contrast. Field curvature is much better controlled with the Jupiter, too. Bokeh is subjective; it's more predictable (and smoother) with the Mitakon.
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Pancolart
Joined: 04 Feb 2008
Posts: 3693
Location: Slovenia, EU
Expire: 2013-11-18
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| Posted: Tue Jul 27, 2010 9:25 am Post subject: |
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Pancolart wrote:
Thank you Aoleg. Huh, huh, it's so hard to find positive sides based on samples. When you manage please take it out for a walk.
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8310
Joined: 05 Jun 2010
Posts: 123
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| Posted: Tue Jul 27, 2010 10:01 am Post subject: |
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8310 wrote:
| 8310 wrote: |
| I guess it is only PK-mount for Pentax, not PK-A? |
Just did some research myself and apparently it actually is PK-A. Besides, there seems to be a silver version availiable. 
http://www.cnpentax.com/thread-1484-1-1.html |
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calvin83
Joined: 12 Apr 2009
Posts: 7554
Location: Hong Kong
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| Posted: Tue Jul 27, 2010 10:45 am Post subject: |
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calvin83 wrote:
| 8310 wrote: |
| 8310 wrote: |
| I guess it is only PK-mount for Pentax, not PK-A? |
Just did some research myself and apparently it actually is PK-A. Besides, there seems to be a silver version availiable.
http://www.cnpentax.com/thread-1484-1-1.html |
The silver version is the pre-order version.
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tkbslc
Joined: 02 Jul 2009
Posts: 194
Location: Utah, USA
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| Posted: Sun Aug 01, 2010 6:06 am Post subject: |
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tkbslc wrote:
I'd like to see a portrait with the lens. I would bet that is what most people by fast 85's for. Some of that softness wide open might actually be a good thing.
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aoleg
Joined: 22 Feb 2008
Posts: 1389
Location: Berlin, DE
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| Posted: Mon Aug 02, 2010 6:42 am Post subject: |
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aoleg wrote:
| tkbslc wrote: |
| I'd like to see a portrait with the lens. I would bet that is what most people by fast 85's for. Some of that softness wide open might actually be a good thing. |
Will do and post one... I promise...
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Romil
Joined: 19 Jul 2010
Posts: 10
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| Posted: Sun Aug 22, 2010 3:33 pm Post subject: |
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Romil wrote:
hi, folks. I'm sorry that I was too busy these days to post some pics for you. I will post them here this week.
And now, a new product is coming out, Mitakon 35mm F2.0 made in China.
I gonna post some pics by this lens today.
All pics are wide open F2.0 test.
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Romil
Joined: 19 Jul 2010
Posts: 10
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| Posted: Sun Aug 22, 2010 3:38 pm Post subject: |
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Romil wrote:
100%
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Romil
Joined: 19 Jul 2010
Posts: 10
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| Posted: Sun Aug 22, 2010 3:42 pm Post subject: |
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Romil wrote:
This lens will be a 1:1 micro lens.
Go on with wide open, F2.0
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Romil
Joined: 19 Jul 2010
Posts: 10
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| Posted: Sun Aug 22, 2010 3:48 pm Post subject: |
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Romil wrote:
Other scenes test.
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Romil
Joined: 19 Jul 2010
Posts: 10
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| Posted: Sun Aug 22, 2010 3:55 pm Post subject: |
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Romil wrote:
All those pics have been adjusted by Photoshop.
I will provide machine-direct .jpgs if anybody would like to see.
and Mitakon Optics Company will provide all products worldwide via ebay.
I'm going to hold a worldwide-group-buy, and maybe could provide silver version products.
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calvin83
Joined: 12 Apr 2009
Posts: 7554
Location: Hong Kong
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| Posted: Sun Aug 22, 2010 4:06 pm Post subject: |
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calvin83 wrote:
| Romil wrote: |
All those pics have been adjusted by Photoshop.
I will provide machine-direct .jpgs if anybody would like to see.
and Mitakon Optics Company will provide all products worldwide via ebay.
I'm going to hold a worldwide-group-buy, and maybe could provide silver version products. |
Thank you Romil for bringing these lenses to all the people over the world.
Please let us know when the silver pre-order version of this lens is avaliable. I will definitely want to buy one.
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aoleg
Joined: 22 Feb 2008
Posts: 1389
Location: Berlin, DE
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| Posted: Mon Aug 23, 2010 1:57 am Post subject: |
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aoleg wrote:
Hmm, your sample seems quite a bit sharper than mine. QC variation or Mitakon has improved the performance of this lens?
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