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 文章主題 : Sony alpha 7/7r
文章發表於 : 週日 17 11月 13 19:27:58 
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註冊時間: 週五 27 1月 06 12:09:10
文章: 492
來自: Singapore
Seen quite a few threads on internet at various forum on the new sony digital cam, many seems to be china site or HK site. any of the experts here have any thing to share?

although alpha 7r would be the one I very much to get, but seems the 7 is better suite to Leica swa. but to get 7 will mean quite a bit of saving so I dun mind. : )

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Rolleiflex 3003, SL2000F - Rolleiflex SL66E - SONY Alpha 7R1 7R2
Carl Zeiss C/Y T* - QBM HFT - M HFT, ZM T* - ZF T* - Batis T* - Otus T*
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 文章主題 : Re: Sony alpha 7/7r
文章發表於 : 週日 17 11月 13 21:58:20 
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註冊時間: 週五 27 1月 06 12:09:10
文章: 492
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not familiar with NEX system. I see people using NEX adaptor. How come aps-c adaptor can be used for full frame?

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Rolleiflex 3003, SL2000F - Rolleiflex SL66E - SONY Alpha 7R1 7R2
Carl Zeiss C/Y T* - QBM HFT - M HFT, ZM T* - ZF T* - Batis T* - Otus T*
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 文章主題 : Re: Sony alpha 7/7r
文章發表於 : 週一 18 11月 13 12:08:02 
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註冊時間: 週六 08 11月 03 07:56:21
文章: 5756
To me, A7 and A7R do have their good and bad points for adapting with older lenses:

A7 - With the 24mp sensor it is less demanding on the MTF performance of the lenses, especially for older wide angle lenses with MTF to be dropping very rapidly towards the border areas. The effect of "Red Gate" could be minimized as well because the pixel size is relatively larger than A7R. However, as mentioned by Sony, A7 do not have the special arrangement of shifted microlenses on the sensor as in the case of A7R, and that would certainly make vignetting to happen more likely. In addition, because of the existence of the AA filter in A7, the thicker filter in front of the sensor would certainly degarde the performance of the symmetrical design wide angle lenses with very steep incident angle of light ray path on the focal plane. (Please refer to the article by Dr.Nesse which explained why Leica had made the filter on M8 to be so thin: http://blogs.zeiss.com/photo/en/wp-cont ... stagon.pdf on page 12)

A7R - As mentioned by Sony, the 36mp sensor on A7R had been designed specifically for lenses with shorter back focus distance. These include shift microlenses arrangement to reduce the effect of vignetting, thinner sensor filter by removing the AA filter layer etc. However, we should be aware that the pixel density of 36mp is really no kidding, for which the demand on the MTF performance is ultra-high! This had been proven in the situation of Nikon D800E already. For the symmetrical wide angle designs like the Biogon or Super Angulon, the distortion had been corrected to extremely low level, but with the trade off on the vignetting performance as well as border resolution. This had been proven already in days of film (e.g. the test of G Biogon 21/2.8 vs CY "Apo" Distagon 21/2.8 ) but with the characteristic of digital sensor the effect is simply magnified now!

So for a good result with 3rd party lenses on the A7 / A7R bodies, it is always better to check:

1. The clearance of the rear lens element to the film plane - as a rule of thumb the longer the better for the result. The shorter one the easier to create smearing effect especially in case of A7 with thicker sensor filter

2. The MTF of the lens - pick one with a high MTF value, and especially for one which could maintain a good result up to the border region. Otherwise it could not meet the resolution requirement of the A7R 36mp sensor

Failing to meet either one of the requirements may end up in disappointing result. And please also remember the very precise focusing requirement in case of the 36mp sensor, and you need a very steady handheld technique to avoid even a very slight hand-shaking

Therefore, if one insist to use the legacy M lenses with digital sensor, the ulimate choice should be still the Leica M8! Or if one is crazy enough, you may send your A7 / A7R to have all sensor filters to be removed. (But then you would need to add UV/IR cut filter in front of the lenses for colour pictures, just as the case of Leica M8)

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 文章主題 : Re: Sony alpha 7/7r
文章發表於 : 週一 18 11月 13 22:19:06 
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註冊時間: 週五 27 1月 06 12:09:10
文章: 492
來自: Singapore
Mr Wah, 髙手出招,真的是不同,拳拳到肉!

Now I remember u have probably showed us this article before, but my memory getting worse now adays.

Now set for the 7r, and pray the ZM15 can work with it, worst case then it's time for the CY 18 or the HFT 18. : )

_________________
Rolleiflex 3003, SL2000F - Rolleiflex SL66E - SONY Alpha 7R1 7R2
Carl Zeiss C/Y T* - QBM HFT - M HFT, ZM T* - ZF T* - Batis T* - Otus T*
http://www.fuwen.net


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 文章主題 : Re: Sony alpha 7/7r
文章發表於 : 週三 27 11月 13 14:18:28 
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註冊時間: 週五 27 1月 06 12:09:10
文章: 492
來自: Singapore
Should be getting my pre-ordered A7r today evening.

Adaptors are all ready to go. CY, Nikon F and M with me. Praktica and QBM on the way ..............

_________________
Rolleiflex 3003, SL2000F - Rolleiflex SL66E - SONY Alpha 7R1 7R2
Carl Zeiss C/Y T* - QBM HFT - M HFT, ZM T* - ZF T* - Batis T* - Otus T*
http://www.fuwen.net


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 文章主題 : Re: Sony alpha 7/7r
文章發表於 : 週一 02 12月 13 11:05:25 
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註冊時間: 週五 27 1月 06 12:09:10
文章: 492
來自: Singapore
Tested the A7r with ZM 15/2.8, 21/2.8, 25/2.8, 28/2.8, 50/2 and 85/2.

No time to look at the jpg/raw on computer in detail yet. But it is clear there are colour shift for the wide angles. Depending on shooting conditions, some case the jpg are still good to go. But for scenary shots looks like I need to go back to CY/QBM 18/4 espically those scene with bright sky and water.

Disappointed that the ZM 15/2.8 scenary shots cannot be used without some editing. Any experts here have already develope a good work flow to go around this?

_________________
Rolleiflex 3003, SL2000F - Rolleiflex SL66E - SONY Alpha 7R1 7R2
Carl Zeiss C/Y T* - QBM HFT - M HFT, ZM T* - ZF T* - Batis T* - Otus T*
http://www.fuwen.net


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 文章主題 : Re: Sony alpha 7/7r
文章發表於 : 週四 12 12月 13 07:46:26 
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註冊時間: 週五 27 1月 06 12:09:10
文章: 492
來自: Singapore
have been playing the a7r for about 2 weeks. Now in Malaysia KL with the a7r. Quite comfortable with this body already and has got most of the customised functions set up.

Had tested with most of my ZM lenses except the ZM 35/2. Actually the images for the 21/2.8, 25/2.8 and 28/2.8 are usable and I began to think that the edge issue is probably light fall off than colour shift and smearing. I am first time seriously dealing with digital sensor and feel that digital sensor is so much more demanding for focusing than film. Even with wide angles I can see the focus sharpness difference between mid range and far object.

Now enjoy the a7r for the following reasons:

1. full frame sensor
2. can mount all my ZM, Praktica, QBM, CY lenses with just one body.
3. EVF allows shooting in stop down mode
4. peaking level with yellow indicator allows easy manual focusing aid
5. no restriction of ISO setting

So far the only issue is flash photography, where if the existing light setting too far off I cannot do framing in working aperture.

_________________
Rolleiflex 3003, SL2000F - Rolleiflex SL66E - SONY Alpha 7R1 7R2
Carl Zeiss C/Y T* - QBM HFT - M HFT, ZM T* - ZF T* - Batis T* - Otus T*
http://www.fuwen.net


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 文章主題 : Re: Sony alpha 7/7r
文章發表於 : 週五 13 12月 13 13:40:52 
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註冊時間: 週六 08 11月 03 07:56:21
文章: 5756
Hello fuwen!

Good to know that you really enjoyed using A7R now! It is such a powerful camera which could simply be the single platform for all Carl Zeiss 135 format lenses ever existed on the market (I am still waiting for the CONTAX N adapter with full auto operation.....)

I suggest that you should consider the vertical grip as well which provide much better handling with the heavy lenses.

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Wah
理事 - Board of Members
www.flickr.com/dicksonlau


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 文章主題 : Re: Sony alpha 7/7r
文章發表於 : 週五 13 12月 13 23:18:37 
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註冊時間: 週五 27 1月 06 12:09:10
文章: 492
來自: Singapore
wah 寫:
Hello fuwen!

Good to know that you really enjoyed using A7R now! It is such a powerful camera which could simply be the single platform for all Carl Zeiss 135 format lenses ever existed on the market (I am still waiting for the CONTAX N adapter with full auto operation.....)

I suggest that you should consider the vertical grip as well which provide much better handling with the heavy lenses.


Dear Mr Wah, already bought the grip. :) A fantastic grip. though expensive, but is dusts and splash proof, with a shutter release, one preset button and a AEL button!

_________________
Rolleiflex 3003, SL2000F - Rolleiflex SL66E - SONY Alpha 7R1 7R2
Carl Zeiss C/Y T* - QBM HFT - M HFT, ZM T* - ZF T* - Batis T* - Otus T*
http://www.fuwen.net


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 文章主題 : Re: Sony alpha 7/7r
文章發表於 : 週日 22 12月 13 13:21:52 
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註冊時間: 週五 27 1月 06 12:09:10
文章: 492
來自: Singapore
Just found out that the A7 grip can accommodate 2 batteries, it only uses the 2nd one when the first one is totally drained. But however, the grip works with just one battery!

_________________
Rolleiflex 3003, SL2000F - Rolleiflex SL66E - SONY Alpha 7R1 7R2
Carl Zeiss C/Y T* - QBM HFT - M HFT, ZM T* - ZF T* - Batis T* - Otus T*
http://www.fuwen.net


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 文章主題 : Re: Sony alpha 7/7r
文章發表於 : 週一 30 12月 13 01:42:34 
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註冊時間: 週日 09 11月 03 03:42:29
文章: 12295
Fu Wen, I bought A7 too...

CY lens system finally alive again!
8) 8)

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 文章主題 : Re: Sony alpha 7/7r
文章發表於 : 週六 12 4月 14 21:07:04 
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註冊時間: 週五 27 1月 06 12:09:10
文章: 492
來自: Singapore
Finally I am serious with digital camera. Have been taking photos with Kodak negatives since 1985, and for some reasons I am waiting for a full frame digital, specifically, with an affordable price. And so Dec 2013 I pre-ordered and got an Alpha 7R.


圖檔
Alpha 7R with the vertical grip and the not so compatible ZM 15/2.8 Distagon T*.


I ordered all the mount convertors I need, including Praktica-E, Rollei QBM-E, Contax CY-E, Leica M-E and Nikon-E. All of a sudden I have a digital body (actually I have and still have a 6 MP Pentax DL but never use it for any serious work) and so many lenses now to used with.

I only use the Alpha 7R in one mode: manual exposure with focus magnifier. And I am very please with the camera.


http://www.fuwen.net/index.php/home/my-digitals/alpha-7r/119-sony-alpha-7r

_________________
Rolleiflex 3003, SL2000F - Rolleiflex SL66E - SONY Alpha 7R1 7R2
Carl Zeiss C/Y T* - QBM HFT - M HFT, ZM T* - ZF T* - Batis T* - Otus T*
http://www.fuwen.net


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 文章主題 : Re: Sony alpha 7/7r
文章發表於 : 週六 12 4月 14 21:07:40 
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註冊時間: 週五 27 1月 06 12:09:10
文章: 492
來自: Singapore
The most disappointing part with Alpha 7R is my ZM M mount lenses with focal length lesser than 35mm are not very usable with the body. For some reasons Sony full frame sensor is not like Leica ones, and does not work well with rangefinder lenses where the rear lens element is very close to the sensor plane, and thus the angle of attack of light rays at the corners will cause colour shift, vignetting and image loss of resolution. But this can be a hit and miss thing where some time I can get images that are usable like the one below taking with ZM 25/2.8 Biogon T*

圖檔
P Ubin Singapore, f5.6 1/125 ZM 25/2.8 Biogon T*, ISO 100, 1 Dec 2013.

_________________
Rolleiflex 3003, SL2000F - Rolleiflex SL66E - SONY Alpha 7R1 7R2
Carl Zeiss C/Y T* - QBM HFT - M HFT, ZM T* - ZF T* - Batis T* - Otus T*
http://www.fuwen.net


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 文章主題 : Re: Sony alpha 7/7r
文章發表於 : 週六 12 4月 14 21:08:06 
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註冊時間: 週五 27 1月 06 12:09:10
文章: 492
來自: Singapore
Or this one taken by the ZM 28/2.8 Biogon T*, note the high centre details.

圖檔

圖檔
f4 1/125 ZM 28/2.8 Biogon T*, ISO 400, 10 Dec 2013.

_________________
Rolleiflex 3003, SL2000F - Rolleiflex SL66E - SONY Alpha 7R1 7R2
Carl Zeiss C/Y T* - QBM HFT - M HFT, ZM T* - ZF T* - Batis T* - Otus T*
http://www.fuwen.net


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 文章主題 : Re: Sony alpha 7/7r
文章發表於 : 週六 12 4月 14 21:08:31 
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註冊時間: 週五 27 1月 06 12:09:10
文章: 492
來自: Singapore
The ZM 15/2.8 Distagon, despite a Distagon design, the rear of the lens is still too close to the full frame digital sensor and thus the corner light rays attack angle is still too steep. However, in certain situation the photographs taken were totally usable, like the shop display below. In fact a close up examination of the lights at the corners there are little colour fringing and image issues.

圖檔
f4 1/60 ZM 15/2.8 Distagon T*, ISO 800, 24 Dec 2013.

A more suitable 15mm would be the Zeiss 15/2.8 ZF.2 but I do not really like the size of it.

_________________
Rolleiflex 3003, SL2000F - Rolleiflex SL66E - SONY Alpha 7R1 7R2
Carl Zeiss C/Y T* - QBM HFT - M HFT, ZM T* - ZF T* - Batis T* - Otus T*
http://www.fuwen.net


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