If this is your first visit, be sure to check out the FAQ by clicking the link above. You may have to register before you can post: click the register link above to proceed. To start viewing messages, select the forum that you want to visit from the selection below. |
|
|
Thread Tools | Display Modes |
#1
|
|||
|
|||
Sony's Alpha 700 replacement to be mirrorless SLT, with APS-C sensor
"RichA" wrote in message ... On Sep 21, 5:59 pm, Bruce wrote: Oh dear. 'Pellicle mirror disease' is spreading through the Alpha range, with several reports of a mock-up of an A700 replacement on the Sony stand at Photokina. So stand by for the A77 to be released in January. Given that the Alpha 850 and 900 are both discontinued, will the A77 become the new top model of the Sony Alpha range?http://preview.tinyurl.com/32mwlkq or:http://www.amateurphotographer.co.uk...0_replacement_... Do you believe in ghosts? You'd better, if you buy one of these. ;-)http://preview.tinyurl.com/3873ep2 or:http://forums.dpreview.com/forums/re...ssage=36125668 That is going to disappoint a lot of A700 fans. Sacrificing light throughput, contrast and probably sharpness in order to get faster frames per second. And reliability, robustness etc. etc. It also probably means that when you open the camera the sensor is not exposed (e.g. to dust) and assuming the mirroring is on the inside face the pellicle easy to clean. |
#2
|
|||
|
|||
Sony's Alpha 700 replacement to be mirrorless SLT, with APS-C sensor
"RichA" wrote in message ... On Sep 22, 8:32 am, "R. Mark Clayton" wrote: "RichA" wrote in message ... On Sep 21, 5:59 pm, Bruce wrote: Oh dear. 'Pellicle mirror disease' is spreading through the Alpha range, with several reports of a mock-up of an A700 replacement on the Sony stand at Photokina. So stand by for the A77 to be released in January. Given that the Alpha 850 and 900 are both discontinued, will the A77 become the new top model of the Sony Alpha range?http://preview.tinyurl.com/32mwlkq or:http://www.amateurphotographer.co.uk...0_replacement_... Do you believe in ghosts? You'd better, if you buy one of these. ;-)http://preview.tinyurl.com/3873ep2 or:http://forums.dpreview.com/forums/re...ssage=36125668 That is going to disappoint a lot of A700 fans. Sacrificing light throughput, contrast and probably sharpness in order to get faster frames per second. And reliability, robustness etc. etc. It also probably means that when you open the camera the sensor is not exposed (e.g. to dust) and assuming the mirroring is on the inside face the pellicle easy to clean. The mirror will likely have a dichroic coating, could be fragile. Additionally, it very well may be on the inside surface, to protect it from being scratched and that could be what is causing the image doubling issues. Even a thin piece of glass, plane-parallel can cause a double image. This is why telescope mirrors and any mirrors used in optics are "first surface" because making them second-surface produces internal reflections. Well indeed, but only on the viewfinder NOT on the sensor. |
#3
|
|||
|
|||
Sony's Alpha 700 replacement to be mirrorless SLT, with APS-C sensor
On Thu, 23 Sep 2010 19:18:09 +0100, "R. Mark Clayton"
wrote: "RichA" wrote in message ... On Sep 22, 8:32 am, "R. Mark Clayton" wrote: "RichA" wrote in message ... On Sep 21, 5:59 pm, Bruce wrote: Oh dear. 'Pellicle mirror disease' is spreading through the Alpha range, with several reports of a mock-up of an A700 replacement on the Sony stand at Photokina. So stand by for the A77 to be released in January. Given that the Alpha 850 and 900 are both discontinued, will the A77 become the new top model of the Sony Alpha range?http://preview.tinyurl.com/32mwlkq or:http://www.amateurphotographer.co.uk...0_replacement_... Do you believe in ghosts? You'd better, if you buy one of these. ;-)http://preview.tinyurl.com/3873ep2 or:http://forums.dpreview.com/forums/re...ssage=36125668 That is going to disappoint a lot of A700 fans. Sacrificing light throughput, contrast and probably sharpness in order to get faster frames per second. And reliability, robustness etc. etc. It also probably means that when you open the camera the sensor is not exposed (e.g. to dust) and assuming the mirroring is on the inside face the pellicle easy to clean. The mirror will likely have a dichroic coating, could be fragile. Additionally, it very well may be on the inside surface, to protect it from being scratched and that could be what is causing the image doubling issues. Even a thin piece of glass, plane-parallel can cause a double image. This is why telescope mirrors and any mirrors used in optics are "first surface" because making them second-surface produces internal reflections. Well indeed, but only on the viewfinder NOT on the sensor. You people seriously need to educate yourselves on what is meant by a "pellicle mirror". Being often only a few molecules thick. Apparently, if internal reflections are causing this image degradation, then the word "pellicle" is being widely misused and the usual resident TROLLS are just parroting what they know not. |
#4
|
|||
|
|||
Sony's Alpha 700 replacement to be mirrorless SLT, with APS-C sensor
SNIP
Well indeed, but only on the viewfinder NOT on the sensor. You people seriously need to educate yourselves on what is meant by a "pellicle mirror". Being often only a few molecules thick. Apparently, if internal reflections are causing this image degradation, then the word "pellicle" is being widely misused and the usual resident TROLLS are just parroting what they know not. Well I haven't taken an a700 apart, but what I would expect to see is a thin, but robust, piece of glass at 45 degrees with a very partial mirror (a sputtering of metal "a few molecules thick") on the rear side. There might be some reflection off the front face, but as this is going to the view finder NOT the sensor the worst that will happen is slight ghosting in the eyepiece. The final image will be virtually unaffected apart from the light lost to the viewfinder and perhaps a very faint secondary reflection. |
#5
|
|||
|
|||
Sony's Alpha 700 replacement to be mirrorless SLT, with APS-C sensor
On Mon, 27 Sep 2010 17:48:02 +0100, "R. Mark Clayton"
wrote: Well I haven't taken an a700 apart, but what I would expect to see is a thin, but robust, piece of glass Then you don't know what a pellicle mirror is. |
#6
|
|||
|
|||
Sony's Alpha 700 replacement to be mirrorless SLT, with APS-C sensor
In article , Russ D
wrote: On Mon, 27 Sep 2010 17:48:02 +0100, "R. Mark Clayton" wrote: Well I haven't taken an a700 apart, but what I would expect to see is a thin, but robust, piece of glass Then you don't know what a pellicle mirror is. A wonderful bird is the pellicle Its reflection shows more than its graticule -- To de-mung my e-mail address:- fsnospam$elliott$$ PGP Fingerprint: 1A96 3CF7 637F 896B C810 E199 7E5C A9E4 8E59 E248 |
#7
|
|||
|
|||
Sony's Alpha 700 replacement to be mirrorless SLT, with APS-Csensor
On 10-09-22 8:32 , R. Mark Clayton wrote:
That is going to disappoint a lot of A700 fans. Sacrificing light throughput, contrast and probably sharpness in order to get faster frames per second. Losing 33% of light is easily compensated with a 1/2 stop increase in ISO setting. In the a700 replacement, the mirror can be flipped out of the way, as well (from what I've read). If you use fast lenses, it's probably not an issue in the first place. While I have my misgivings about Sony's direction (and esp. the ghost issue), I also look at the positives: -ability to review images in the EVF - no ambient light issues. -phase detect focus (faster than contrast and allows AF during video (if that's your thing). -Possibly no "interrupt" shooting. Eg: no "blackout" during the shutter cycle (I don't know if that's the case) or at least a very short blackout. Possibly the ghosting issue can be solved (wishful/hopeful thinking perhaps). What worries me more is what they may do with the a900 successor. Some sites claim that Sony are not looking back, that the pelicle and EVF's are the sole path forward. 2B seen. -- gmail originated posts are filtered due to spam. |
Thread Tools | |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
Mirrorless, filmless. | Irwell | Digital Photography | 9 | September 16th 10 02:55 AM |
Nikon to go mirrorless | Neil Harrington[_5_] | Digital Photography | 1 | July 22nd 10 05:21 PM |
New backlit sensor, full frame Sony's in 2010? | Alan Browne | Digital SLR Cameras | 2 | November 5th 09 01:02 PM |
Sony's Alpha (clear resolution leader) | RichA | Digital SLR Cameras | 5 | December 17th 06 04:21 AM |
Sony's Alpha..I saw it, nice "try" better luck next time... | RichA | Digital SLR Cameras | 86 | August 9th 06 01:38 AM |