新推出 Lunt Solar Imager LSi (太陽攝影機)

Equipment (Solar) - 白光、H-Alpha、Cak光譜觀測及攝影器材

新推出 Lunt Solar Imager LSi (太陽攝影機)

文章

社長 » 2011-07-20, 13:50

剛收到Lunt Solar System發報消息,推出全新推出 Lunt Solar Imager LSi 太陽攝影機

We are excited to announce that Lunt Solar is entering Imaging!

We get asked all the time what camera is best with the Lunt Solar scopes and filter now we can say ours. Below are the details of the new Lunt Solar Imager (LSi). We have these ready for immediate delivery.

香港交收 HK$18360
內地連運費 RMB15706,可滙款至廣州工行賬戶

Includes the Lunt Solar Imager (LSi), Custom Lunt Solar Software (also compatible with standard nighttime software for night use), and Lunt Solar imaging instructions for use with the Lunt Solar scopes.

CCD type: Sony ICX285AL Exview HAD CCD with ultra low dark current, extended IR response and vertical anti-blooming.

CCD quality: Grade 1 or better - No bad columns, no dead pixels, no more than 6 'hot' pixels (saturated in <10 seconds).

CCD Full resolution Pixel data: Pixel size: 6.45uM x 6.45uM, Image format: 1392 x 1040 pixels

CCD Image area: 8.98mm (Horizontal) x 6.7mm (Vertical).

Spectral Response: QE max at 540nM (~65%), 50% roll-off at 400nM and 750nM.

Readout Noise: Less than 7 electrons RMS - typically ONLY 5 electrons!

Full-well capacity: Greater than 23,000 e- (un-binned)

Anti-blooming: Overload margin greater than 800x.

Dark current: Dark frame saturation time greater than 100 hours. Less than 0.02 electrons/second @ + 10C ambient.

Data format: 16 bits.

System gain: 0.45 electrons per ADU

Computer Interface: Built-in USB 2.0 compatible interface.

Image download time: Typically 0.6 seconds full resolution using USB 2.0, approximately 2 seconds with USB 1.1.

Power requirements: 115VAC / 240VAC @ 12VA, or 12VDC @ 750mA max.

Cooling system: Regulated set-point cooling supply with single stage thermoelectric cooler to give a CCD temperature of up to -30C below ambient.

Size: 75 x 70mm red anodized aluminum barrel with 42mm 'T2' thread at the CCD window end & input/output plugs at rear.

Weight: approx. 300g

Lunt will provide full support and instructions for Solar Imaging.
附加檔案
image001.jpg
image001.jpg (6.98 KiB) 被瀏覽 20054 次
兩個天文台 - 白鷺湖天文台、西藏自動化天文觀測站
主鏡 - Officina Stellare 500 口徑f3.8 RiFast攝星儀、APM/TMB 254 f9 APO、SkyWatcher Dob 18、305 f8.5 牛頓鏡、Paramount ME 赤道儀
配件 - 2 full sets of Supermonocentrics、Baader Mark V Binoviewer、Ethos、Canon 5D Mark II Mod、FLI Proline 16803冷凍相機、Mercedes SUV
星河科研社 http://www.astro.hk 電郵 saviofong@astro.hk
頭像
社長
Site Admin
 
文章: 12686
註冊時間: 2010-02-01, 14:17
來自: 香港

Re: 新推出 Lunt Solar Imager LSi (太陽攝影機)

文章社長 » 2011-07-26, 08:31

日前向Lunt查詢了關於這個相機的細節,剛收到回覆。

----------------------------------------------------------
Hi Savio,

Thank you for your interest in our new camera LSi. We know there are many different types of cameras on the market but we feel ours will allow people to take very high end easy processed pictures.

The shortest exposure is 1/1000 of a second, this really should be short enough.

The download time cannot be adjusted I'm afraid but there are some distinct advantages.

The DMK51 is only 9 bit data (although I believe they only download 8 bits) your camera is a 16 bit camera and will therefore give you a much bigger dynamic range (number of grey levels).

The DMK51 also uses a Sony ICX274 CCD which has much smaller pixels and will therefore have a much smaller 'Full Well Depth' so again the number of grey levels that it can detect will be much less so the images will not have as much detail in them when you start to process them.

As for creating video, it is possible to take 1 frame every 0.6 seconds and automatically save the images and then put them into Regi-stack and create a movie. It won't have as many frames but it will have more detail.

I hope this helps. Please let me know if you have any other questions.

Thank you,
Rikki Hocking
Lunt Solar Systems
兩個天文台 - 白鷺湖天文台、西藏自動化天文觀測站
主鏡 - Officina Stellare 500 口徑f3.8 RiFast攝星儀、APM/TMB 254 f9 APO、SkyWatcher Dob 18、305 f8.5 牛頓鏡、Paramount ME 赤道儀
配件 - 2 full sets of Supermonocentrics、Baader Mark V Binoviewer、Ethos、Canon 5D Mark II Mod、FLI Proline 16803冷凍相機、Mercedes SUV
星河科研社 http://www.astro.hk 電郵 saviofong@astro.hk
頭像
社長
Site Admin
 
文章: 12686
註冊時間: 2010-02-01, 14:17
來自: 香港

Re: 新推出 Lunt Solar Imager LSi (太陽攝影機)

文章社長 » 2011-08-16, 08:10

Frequently Ask Questions about the LSi Camera

• What are the advantages of this camera over other cameras (like DMK41…)?

- The main advantage is the significant lack of post-processing you have to perform on the images. What is the point of having to take and then sift through 600+ images to pick out the best ones, then process them up and then combine them all to get one good image With the LSi camera you are able to take 10 good images, process them up and stack them together? The real key to this is the dynamic range. We have had imagers blown away when they take the first image; do a very simple contrast stretch and have one image with all of the prominences around the outside and loads of surface detail.
Unfortunately planetary imagers are used to having to take thousands of images, going through and picking out the best ones and then adding these together to give the final result. The main reason for this is that typically the planetary exposure times are about 1/10th of a second and therefore the turbulence over that long an exposure (even though it is still pretty short) can be quite significant. By taking hundreds or thousands of images, they can select a few tens of those least affected by seeing and combine these into a high resolution result. With the sun, however, the exposures are much shorter and therefore all of your images are much less affected by the seeing conditions. You do not need to take thousands of images, but just a few with the excellent dynamic range (number of grey levels) offered by the LSi. A quick and easy contrast stretch and sharpening filter will give you an excellent finished image, without all of the hassle of selecting and stacking hundreds of frames.
The LSi camera uses a 2/3” format CCD which is ideally suited to fit the whole of the sun on to the CCD in one image. It also has larger pixels which have larger ‘full-well depth’ and incredibly low read noise which allows the camera to produce a very high dynamic range. It uses a 16bit A/D converter giving 65,536 grey levels compared to 8bit (256 grey levels). To get the best image from an 8bit camera you need to take lots of over exposed images and average them together to build up the good data on the prominences and then take a lot of images, under exposed, to get the surface detail, and then add all the frames together. Because this LSi camera has such a large dynamic range, you are able to capture both the prominences and the surface detail in one image and with the exposure times so low, you can almost freeze the seeing conditions.

• How many frames per second?

- 1 frame every 0.6 seconds.

• Possible exposure times?

- 1/1000th second to 90+ minutes

• Can the camera (and the software) also be used for deep-sky imaging? Is there a cooling solution?

- Yes the camera is ideally suited for both solar and deep-sky imaging. It has a single-stage peltier cooler which cools the camera to approximately –30C below ambient and has set-point cooling so you are able to set the temperature to the required point.

• How does the LSi camera connect to my computer?

- The LSi camera comes with a USB2.0 cable.

• What power supply cord do I need to purchase?

- The power is derived from a power supply cord which is included in the package.

• Can I use it to create videos?

- It is possible to take 1 frame every 0.6 second and automatically save the images. You would ten put them into Regi-stack and create a movie. It will not have as many frames but it will have more detail.

• Is power supply only for US standard, or is there a power supply for European standard (230V AC)?

- The supplied power supply is an auto-ranging switch-mode power supply and will accept 100 – 240V AC.

• Is it a black & white or a color camera?

- This is a monochrome camera.

• What is the connection to the telescope?

- The LSi camera has a T2 thread in the front but also comes with a 1.25” push-fit adaptor and a 2” push-fit adaptor.

• What software is included? Is it special software for solar imaging?

- The software supplied is aimed at solar imaging but additional free software can be downloaded for deep-sky imaging. It will also work with third-party software such as Maxim DL, & AstroArt.

• What computer systems is the software compatible with?

- The software works for all versions of Windows (even 64bit Windows).

• What accessories are available?

- The camera comes complete with software, adaptors, power supply and all contained in a presentation ABS case to keep it clean and safe.
兩個天文台 - 白鷺湖天文台、西藏自動化天文觀測站
主鏡 - Officina Stellare 500 口徑f3.8 RiFast攝星儀、APM/TMB 254 f9 APO、SkyWatcher Dob 18、305 f8.5 牛頓鏡、Paramount ME 赤道儀
配件 - 2 full sets of Supermonocentrics、Baader Mark V Binoviewer、Ethos、Canon 5D Mark II Mod、FLI Proline 16803冷凍相機、Mercedes SUV
星河科研社 http://www.astro.hk 電郵 saviofong@astro.hk
頭像
社長
Site Admin
 
文章: 12686
註冊時間: 2010-02-01, 14:17
來自: 香港

Re: 新推出 Lunt Solar Imager LSi (太陽攝影機)

文章universe24 » 2011-08-16, 13:09

其实拍摄多张叠加的意义在于可以有更多在好seeing下拍摄到的影像,然后叠加起来,提升影像素质。

读取速度在0.6秒的话,30秒里最多只有30来张,而这30来张的影像里,又有多少是捉得住好seeing的呢?如果说别的相机可以在每秒60张的速度拍摄,而在0.5秒的好seeing下,就已经有30张好seeing的影像了,叠加起来的素质就会较好。


当然,16bit确实是个不错的优势。
頭像
universe24
 
文章: 1237
註冊時間: 2010-02-13, 16:41

Re: 新推出 Lunt Solar Imager LSi (太陽攝影機)

文章社長 » 2011-08-16, 13:29

universe24 寫:其实拍摄多张叠加的意义在于可以有更多在好seeing下拍摄到的影像,然后叠加起来,提升影像素质。

读取速度在0.6秒的话,30秒里最多只有30来张,而这30来张的影像里,又有多少是捉得住好seeing的呢?如果说别的相机可以在每秒60张的速度拍摄,而在0.5秒的好seeing下,就已经有30张好seeing的影像了,叠加起来的素质就会较好。


当然,16bit确实是个不错的优势。


我對Lunt的回覆有些疑問,或許要用實物去測試一下才可作準。

疊加的第一個目的應該是增加訊噪比,這點對於8 Bit的照機來說十分重要,但如果相機本身拍攝時的增益設得很低,疊加十多張已經足夠,再增加只會柔化影像,帶來反效果。

但疊加又會有另一些問題,對月亮及太陽這類天體來說尤為重要,因為對一些大面積天體,你拍一千張照片裡面可能會找到一些瞬間視寧度理想,看來銳利的影像,但本身郤因為不同程度的變型而不能疊加起來,這問題又以大口徑望遠鏡較嚴重。因此疊加本身不在於銳化影像,過度疊加反而有反效果。一些訊噪比高,調焦準確的影像,疊加十多廿張其實已很足夠。
兩個天文台 - 白鷺湖天文台、西藏自動化天文觀測站
主鏡 - Officina Stellare 500 口徑f3.8 RiFast攝星儀、APM/TMB 254 f9 APO、SkyWatcher Dob 18、305 f8.5 牛頓鏡、Paramount ME 赤道儀
配件 - 2 full sets of Supermonocentrics、Baader Mark V Binoviewer、Ethos、Canon 5D Mark II Mod、FLI Proline 16803冷凍相機、Mercedes SUV
星河科研社 http://www.astro.hk 電郵 saviofong@astro.hk
頭像
社長
Site Admin
 
文章: 12686
註冊時間: 2010-02-01, 14:17
來自: 香港

Re: 新推出 Lunt Solar Imager LSi (太陽攝影機)

文章universe24 » 2011-08-16, 14:26

拍摄全日面来说,其实讯噪比可以很高的,所以叠加张数少确实没问题。
如果是局部放大拍摄,而单张讯噪比又好的话,seeing的影响会很明显,这时就要靠张数来取得更多的好样品,从中提升照片素质。
最近使用R6的多点对齐,发现以前拍摄得很差的黑子放大影像,在叠加后影像素质有所提升,我想R6的多点对齐叠加法已经相当不错了。
頭像
universe24
 
文章: 1237
註冊時間: 2010-02-13, 16:41

Re: 新推出 Lunt Solar Imager LSi (太陽攝影機)

文章社長 » 2011-08-16, 16:04

什麼叫R6多點對齊?用什麼軟件做?
兩個天文台 - 白鷺湖天文台、西藏自動化天文觀測站
主鏡 - Officina Stellare 500 口徑f3.8 RiFast攝星儀、APM/TMB 254 f9 APO、SkyWatcher Dob 18、305 f8.5 牛頓鏡、Paramount ME 赤道儀
配件 - 2 full sets of Supermonocentrics、Baader Mark V Binoviewer、Ethos、Canon 5D Mark II Mod、FLI Proline 16803冷凍相機、Mercedes SUV
星河科研社 http://www.astro.hk 電郵 saviofong@astro.hk
頭像
社長
Site Admin
 
文章: 12686
註冊時間: 2010-02-01, 14:17
來自: 香港

Re: 新推出 Lunt Solar Imager LSi (太陽攝影機)

文章universe24 » 2011-08-16, 19:39

R6是Registax 6的缩写,多点对齐就是multipoint alignment。
頭像
universe24
 
文章: 1237
註冊時間: 2010-02-13, 16:41

Re: 新推出 Lunt Solar Imager LSi (太陽攝影機)

文章社長 » 2011-08-16, 21:38

我發現對於大面積目標,avistack遠比registax 5好,例如:

viewtopic.php?f=16&t=973&start=20

只是不知R6是否比R5好  :roll:
兩個天文台 - 白鷺湖天文台、西藏自動化天文觀測站
主鏡 - Officina Stellare 500 口徑f3.8 RiFast攝星儀、APM/TMB 254 f9 APO、SkyWatcher Dob 18、305 f8.5 牛頓鏡、Paramount ME 赤道儀
配件 - 2 full sets of Supermonocentrics、Baader Mark V Binoviewer、Ethos、Canon 5D Mark II Mod、FLI Proline 16803冷凍相機、Mercedes SUV
星河科研社 http://www.astro.hk 電郵 saviofong@astro.hk
頭像
社長
Site Admin
 
文章: 12686
註冊時間: 2010-02-01, 14:17
來自: 香港


回到 儀器 - 太陽觀測儀器

誰在線上

正在瀏覽這個版面的使用者:沒有註冊會員 和 1 位訪客

cron