Tagged with slt - Personal View Talks

Sony A77 II camera topic

Vitaliy_Kiselev — Thu, 01 May 2014 03:15:04 +0000

24mp CMOS sensor
may be last SLT camera
Bionz X LSI
50-51200 ISO
up to 12fps
Video up to 1080p60 24Mp, AVCHD 2.0
79 AF points (15 points cross type)
1.2md 3" LCD
2.3,d OLED VF
1/8000 sec shutter
Sensor based stabilization
WiFi, NFC
Weather resistant body
$1199

Samples, links

Available at:

Sony A99 Official Topic

ahbleza — Thu, 09 Aug 2012 22:21:40 +0000

Specifications:

24.3MP full frame CMOS Exmor sensor
Translucent mirror technology
ISO range: 100-25,600 (ISO-low 50 is also available)
14 bit RAW output
1/8000 minimum shutter speed, shutter life: 200,000 shots
10 fps
AF: 102 points AF system
2360k dots XGA OLED viewfinder (same as NEX 7)
3″ tiltable 921k dots LCD screen (nothing new, not camera style like GHx)
Auto HDR capability
Video Modes : AVCHD: PS - 1920 x 1080/60p@28Mbps FX - 1920 x 1080/60i@24Mbps FH - 1920 x 1080/60i@17Mbps FX - 1920 x 1080/24p@24Mbps FH - 1920 x 1080/24p@17Mbps MP4: HD - 1440 x 1080/ 30p@12Mbps
Uncompressed HDMI Output (24p, 60i and 60p, suitable for recording!)
Built-in stereo mic
Built-in flash with guide number of 12
Clear Image Zoom increases the effective focal length of your lens up to 2x.
Digital Zoom : Still images: 4x Movie: 4x
Two memory slots: SD and SD+MS cards
Built-in GPS
Very light, weather sealed magnesium alloy body
Optional accessory RMT-DSLR2 Remote Commander® for movie shooting that includes a dedicated movie record button.
Headphone Jack : Yes (3.5 mm Stereo minijack)
Microphone Input : Yes (3.5 mm Stereo minijack)
Weight: 730 g.
Price: $2800
Availabe from 11/02/2012

Availabe at:

Reviews and previews:

Samples and videos:

Sony are starting to target the same market for professional DSLR filmmakers that the Canon 5D/7D and Nikon D800/D4 have been addressing.

Sony Alpha SLT-A58

Vitaliy_Kiselev — Wed, 20 Feb 2013 00:17:50 +0000

Specifications:

20.1 megapixels sensor
SteadyShot sensor stabilization
Cheap 460,000 non touch screen
OLED viewfinder
Video 1920 x 1080p25 (and 50i) with stereo sound
Weight - 429g
129mm x 95mm x 78 mm

Previews:

Sony A55 bahaviour with and without mirror

Vitaliy_Kiselev — Mon, 29 Aug 2011 09:56:16 +0000

1. The mirror reduces the amount of light reaching the sensor by about 1/2 stop. This is what we've been told all along, and my tests confirm it. Although it's probably hard to see in the images above, the shot with the mirror is actually slightly underexposed compared to the one without the mirror, even though the shutter speed in the second shot was 1/3 stop slower. If the A55 provided manual shutter speed increments of 1/2 stop, I believe a setting of 1/2800s would have produced exactly the same overall exposure as the first shot.

2. The mirror reduces image detail. It's logical to expect this... but again, many discussions have been posted about exactly how much image degradation occurs. The 1:1 pixel crops that I've included help to show how much. Another clue is provided through the relative file sizes of the two versions of the scene. A55 RAW and JPG files are compressed when saved from the camera. Both files from the non-mirror version are slightly larger in size than the files from the mirror version by a few percent. This indicates that the non-mirror version must contain more detail and/or more noise. Since noise should be essentially the same in both shots, we can attribute the larger size to more detail.

I am going to add something important here. Remember that in this recent test I used an aperture of f/2.8 to obtain the worst possible purple fringe effect. But I have shot similar tests at other apertures, and in many of those tests the results without the mirror are nearly indistinguishable in terms of detail rendition.

So how significant is the reduction of image quality in real terms? I can't be scientifically precise, but I'm going to say that the mirror may produce up to about a 5% loss of detail, but it depends on the aperture, and perhaps on other factors as well. This figure comes from comparing the file sizes in the worst case examples as mentioned above, and also from doing separate experiments not shown here. I downsampled the f/2.8 non-mirror shot to 95% of its full size, then upsampled it again to its original size, then compared that result to the mirror shot and found the visible detail to be roughly the same. So until I learn of a more scientific way to do this evaluation, I will say the mirror can be expected to retain at least 95% of the image detail of a non-mirror shot.

3. Purple fringing is not influenced in any way by the SLT mirror. This is immediately obvious by looking at the 1:1 pixel crops.

4. I have nothing to add regarding the 'ghosting' effect of the mirror, which has been shown to cause tiny duplicates of point source lights in night shots. I believe that has been adequately documented.

Via: http://thesybersite.com/sony/a55/index.htm#slt_mirror_image_quality