www.astrocafe.hk

我個人一直推薦使用APO折射鏡，配合匹配的平場或減焦鏡拍攝，因為彈性大及性能理想。若要求焦距長，則可考慮以攝星優化的牛頓鏡。

但論最終極的攝星鏡，則非 Riccardi Honders Astrograph 莫屬了。

Honders Astrograph 本來為荷蘭一位光學師設計，採用牛頓鏡格局，後來經Dr Massimo Riccardi 改良而成卡反格局。本人去年專程到意大利考察，其中一個目的就是要跟Massimo學習，他也除了幫Astrophysics設計一些產品外，也幫APM改良了TMB的設計，出品全球最大口徑的510 f12.5APO折射鏡，以及最新0.75x Super ED reducer：
viewtopic.php?f=21&t=611

RH 攝星儀剛推出沒多久，都是大口徑的，Massimo 為Astrophysics設計的是305 f3.8，而為意大利Officina Stellare (即前A&M)設計的，則多力一片光學元件，推上f3.0，而且後焦點更長(RH300及RH200分別為115、170mm)，但兩者的售價都十分昂貴，令大多數人郤步：
viewtopic.php?f=13&t=92

http://www.astro-physics.com/index.htm? ... 305honders

最近 Officina Stellare 推出RH200攝星儀，售價4200歐元，對於一眾鍾情拍深空的同好，可以考慮了.....

口徑 200mm，焦距 600mm (f3)

這種攝星儀有幾項重要優點，

- 大成像圈，RH300成像圈為60mm直徑，可照顧16803晶片，RH200成像圈為43mm，可照顧全片幅
- 星像銳利，以RH300計，軸上成像6um (1.2um RMS)、26mm軸外成像12um (2.1um RMS)，即可配合5um或以下像素實效拍攝。
- 焦點穏定，每攝氏度，焦點偏移僅4um
- 全球面設計，對光軸偏差不敏感，但因為不像牛頓鏡有懸空的副鏡部件，光軸十分穏定，但亦極容易調整。
- 鏡筒比焦距短，約只有40%長度，以RH200計，鏡筒長235mm、直徑283mm、重8.4Kg，即一般EQ3 Pro或EQ5 Pro都可應付。
- 當然最重要是其F3光圈，就算減去中央遮蔽減光，也比常規的折射系攝星鏡要快。

星河科研社為 Officina Stellare 地區代理。

I cannot find the RD200 in http://www.officinastellare.com , but RD300. In the official website, they don't mention the price. The website design is really Italian, stylish, but …. Anyway I found more info in opt, including the price.
http://www.optcorp.com/product.aspx?pid ... 1089-14772
The price of RH300 is really scary! US$28,595.00! It is even more expensive that Astrophysics' RH 305 (US$17,500.00) !
http://www.astro-physics.com/index.htm? ... 305honders
I understand 305mm & 300mm make no significant difference at all, but F3.8 & F3.0 make a huge difference. At least from technological point of view, they are at different level. Anyway, RD300 is not for odinary people….
So back to the RH200, is the price u mentioned, EUR$4200, including the VAT? The photos u posted is final product in production or prototype? Do u have the optical design diagram of RH? If it is spherical, how about the coma? Handled by extra optics?

See here,
http://www.cloudynights.com/ubbthreads/ ... art/2/vc/1

Hi all,

my name is Massimo Riccardi the italian author/developer/designer of the Riccardi-Honders.
In general I don't use to write on forums however, since this is one of the most important forum, I wished to post here few words for clarifying some concepts.
Yes ,I confirm there is not only the R-H produced by Roland Christen there also is that "Made in Italy" .
Roland is a friend for me and not only the dealer of my software (Atmos lens design software and AtmosFringe interferogram analysis software are sold in the AP website).
Roland is also that who firstly proposed my name on this scheme because several years ago I developed the original idea of Klaas Honders and was able to develop/design a particular Cassegrain-type configuration which was fast,compact and well corrected over a large field only by utilizing spherical surfaces.
This is why it is called Riccardi-Honders.
Roland loved so much my scheme to decide (like me) to make a product like this.
The only difference is that Roland preferred a slightly different design from mine (differences are small yet).
Riccardi-Honders in general have a front corrector, a Manging mirror , a secondary mirror and finally a corrector located at same distance before the focal plane.
Roland preferred in his design a single lens corrector while my faster design include a two-lens corrector and a much longer backfocus (about 180mm)
II only wish to inform that the R-H astrograph that will be available (very soon) by A&M is designed by me.
It is a faster 300mm F-3 Riccardi-Honders which
performs a wide flat well-corrected field (about 60mm).
The instrument will be focus stable since there will be special material for the tube in order to compensate the shift.
There also is another new A&M website here:

www.officinastellare.com

where you can find it.
Within few days there will be assembled the first optical sets for the market.

For those interested to very large astrographs soon there
will be available another incredible astrograph.
I designed another different configuration in the range 350-800mm diameter F/3.6 astrograph performing about 8-10 micron over an huge 80-90mm field diameter.
The name will be Riccardi Large Astrograph.
The first one will be ready within the end of may.
It is a 560mm diameter F/3.6 and I think yoou will see it at the next AIC and NEAF exibition at the A&M stand and in their website.

I hope this may be interesting for someone out there.

Regards (and sorry for my english).
Massimo Riccardi

willis 寫:I cannot find the RD200 in http://www.officinastellare.com , but RD300. In the official website, they don't mention the price. The website design is really Italian, stylish, but …. Anyway I found more info in opt, including the price.
http://www.optcorp.com/product.aspx?pid ... 1089-14772
The price of RH300 is really scary! US$28,595.00! It is even more expensive that Astrophysics' RH 305 (US$17,500.00) !
http://www.astro-physics.com/index.htm? ... 305honders
I understand 305mm & 300mm make no significant difference at all, but F3.8 & F3.0 make a huge difference. At least from technological point of view, they are at different level. Anyway, RD300 is not for odinary people….
So back to the RH200, is the price u mentioned, EUR$4200, including the VAT? The photos u posted is final product in production or prototype? Do u have the optical design diagram of RH? If it is spherical, how about the coma? Handled by extra optics?

RH200 是4200歐圓稅前優惠價，須8月1日前下單。

RH300是叫好不叫座了......

RH的一片重要元件是Mangin mirror, 即一片透鏡而反光膜是在底部的，光線兩次通過同一鏡片反射出來，這系統修正度很高的：
http://en.wikipedia.org/wiki/Mangin_mirror

若比較Astrophysics或OS兩款，OS因為多加了一片透鏡所以可以造到F3，而且後焦點長很多，這點對於拍深空來說很重要，因為中間可以加入偏軸導星器、濾鏡盤、自適應光學等東西。若以AP的RH來說，因為是f3.8，而且RH的副鏡比率很大，減去失光因素，其實並不快過一些折射鏡或牛頓鏡，例如ASA的牛頓便可以在4以下甚至2.8工作，所以RH的機械穏定度才是亮點。但OS的光圈達3.0，而相對於那些F2的施卡改裝而修正視像小得很的攝星儀來說，其43及60mm成像圈是大而實用的。

一些單張....

能被社长称作 “顶级摄星镜” 的东西真不多，终极就更少了。

和MX赤道仪是一个颜色的jersey !

附带提个问题，跟踪设备推荐考虑 EQ6 吧？

折合中央遮蔽，算个F4.2-F4.5吧，大概相当于130-150之间口径的了，还是很快的！希望这个镜子冷却表现也快些！

希望我的估算问题相差不太大！

Nebulas 寫:能被社长称作 “顶级摄星镜” 的东西真不多，终极就更少了。

和MX赤道仪是一个颜色的jersey !

附带提个问题，跟踪设备推荐考虑 EQ6 吧？

折合中央遮蔽，算个F4.2-F4.5吧，大概相当于130-150之间口径的了，还是很快的！希望这个镜子冷却表现也快些！

希望我的估算问题相差不太大！

連相機可能在10公斤水平，焦距僅600mm，光圈又這麼大，EQ5 Pro都可以了，HEQ5 Pro會更穏。

viewtopic.php?f=23&t=427

以中央遮蔽55%(主副鏡直徑比例)，假設透鏡及反射部份沒多少失光，等於160mm折射鏡吧，即f3.75水平，算是常規折射鏡中最快的一類了。

APM-TMB 130/780 + Borg F4 Super ED reducer，有效光圈在f3.6左右，可以照顧全片幅。

viewtopic.php?f=21&t=686
看首兩幅：
http://web.me.com/soenke.schnepel/astro ... 0_F_6.html

FSQ106 也有f3.6減焦鏡。

但RH的亮點的焦點穏定，實質星點比折射鏡要銳，而且鏡筒短光圈大。若用牛頓鏡，從光學上其實可以做得一樣好，但實際應用是，往往更多是機械造成的問題，打了折扣。

想問一下:
1. 有沒有調光軸問題? 反射及折反在調光軸使人郤步.
2. 有沒有折反 mirror shift 問題?
3. 要不要加 mpcc, flattener, 等配件?
4. 跟什麼 Focuser?
5. 四角失光情況嚴重嗎?

中央遮蔽失光都很嚴重, 有沒有正式官方數據作參考? 總面積失光多少?

funoooo 寫:想問一下:
1. 有沒有調光軸問題? 反射及折反在調光軸使人郤步.

光軸可調，也十分穏固：

viewtopic.php?f=13&t=92

funoooo 寫:2. 有沒有折反 mirror shift 問題?

沒有，因為主副鏡都是固定的，以後面的調焦筒調焦

funoooo 寫:3. 要不要加 mpcc, flattener, 等配件?

這是真正的攝星儀，當然不用加東西拍攝，當然亦不適合目視

funoooo 寫:4. 跟什麼 Focuser?

這個可說，但羽毛是最基本要求，或FLI PDF等也可以

funoooo 寫:5. 四角失光情況嚴重嗎?

沒問題，RH200對應135全片幅、RH300對應16803。

中央遮蔽失光都很嚴重, 有沒有正式官方數據作參考? 總面積失光多少?[/quote]

若以副鏡為主鏡60% CO計，即失光36%。不少攝星牛反的副鏡都在30%以上，近40% CO的水平，已近20%失光了。

最新測試報告，很強悍的。

用上這台鏡，本來一晚拍兩三個目標，現在可以拍上6到8個充足曝光的目標。

現時香港交收價：

OTA no focuser - HK$ 50700

OTA - HK$53000 (Best buy，配原厰調焦座，可加配電子調焦馬達)

OTA with Atlas focuser - HK$ 78500

"... The system produces tight, round star images on a large, flat focal surface through a wide range of wavelengths. And it can be made with large apertures and very fast f/rations. In other words, the Riccardi-Honders design has the qualifications required to make it the Holy Grail of astrophotographers...."

"... Overall, the RH200 performed superbly. Ghost images were never a problem, and halos around very bright stars were acceptable.... The focus was remarkably stable over the temperature.... I measureed star diameters that tracked perfectly... despite a temperature drop of 5.6C.... I also found no need to refocus... red, green and blue images or narrowband images using H-alpha, SII, and OIII filters...."

Quote :

First Light OS Veloce RH 200 and DDM60 Pro

Hi guys,

As always, the Rosette Nebula proves to be an excellent trial field for new equipment. This time, the combination between the Officina Stellare Veloce RH 200 and DDM60 Pro.

Here are 7 UNGUIDED frames, of 15 minutes each, taken over one night, two weeks ago. I am bringing the full-res image, which has reached a roundness level which I have never experienced in the past (Roundness 0.016 FWHM 2.751). I highly recommend taking a look at the central cluster...

Full resolution:
http://www.pbase.com/image/153974303/original

For a 1570x1186 pixels version of this image see:
http://www.pbase.com/boren/image/153975424/original

Any comments / questions are, as always, very welcome.

Cheers,
Harel

Spectacular picture from Harel Boren and Tal Faibish! NGC 2264, Cone, Fox-Fur and Christmas Tree Nebulae imaged with Officina Stellare Veloce RH200 and SBIG ST8300M camera

https://www.facebook.com/photo.php?fbid ... =1&theater

Officina Stellare RH 300 攝星儀最新抵港

viewtopic.php?f=22&t=3798#p24503

Florida 冬季星空派對

Quote :

Richard Wright won the Deep Space Astrophotography Contest! Our compliments! Beautiful shot! ... Scope: the Officina Stellare Veloce RH 200!

https://www.facebook.com/photo.php?fbid ... 321&type=1