How much for a MF Nikon 300mm f2.8?

[willis]

I am thinking about to buy a cheap, but good condition MF Nikon 300mm f2.8. What is the approximated street price? Any second-hand shops suggestion? Many thanks!

[社長]

I am thinking about to buy a cheap, but good condition MF Nikon 300mm f2.8. What is the approximated street price? Any second-hand shops suggestion? Many thanks!

不懂價格的路過....

但若你是拍星用的，我有另外的建議。

[willis]

I am thinking about to buy a cheap, but good condition MF Nikon 300mm f2.8. What is the approximated street price? Any second-hand shops suggestion? Many thanks!

不懂價格的路過....

但若你是拍星用的，我有另外的建議。

當然用來攝星，如果用來打雀又有錢的話，就會買AF 300mm f2.8。不過你可講講你的建議。

[社長]

從實戰角度看，可以研究一下BORG，我也是代理，那次和你到台灣，我的APM-TMB 105/650就是配BORG的F4 Super ED reducer。或許先等數月，我等一台全新的東西出來後，希望有測試成果讓你考慮。

現在已開厭倦了用鏡頭調焦，就算手上有180 Macro也是這樣說。而且鏡頭像質根本不可能跟平場後的望遠鏡比較。在數碼年代，ISO隨時可以推上6400實效拍攝，若有F4上下的光圈其實已足夠大部份用途。若推上F2.8甚至F2的，相信很多人都沒能力把焦點調至最準，最後其實發揮不盡應有解像度，100%出圖下立見高下。而且因為鏡頭的全照明像場一般沒有望遠鏡大，一台2.8鏡頭，只會集中在像場中央一帶給你f2.8的光量。你看我的105/650至今在Astrocafe的出圖都沒有做平場的。

我不是說BORG特別好，也沒有系統化的體驗，但在200至400mm焦距範圍是很討厭的，一方面又要像較長焦的500mm以上攝星鏡比解像度，但又要像相機鏡頭那樣照顧大視場。400mm以下沒有像BORG齊全的望遠鏡攝星系統，而這焦段的相機鏡頭貴得來也在像質上妥協了不少，看我那台全新的Canon 180/3.5 Marco，連4/3片幅的ST8300M也要做平場：

viewtopic.php?f=17&t=621

所以BORG應該是該焦段中的較合理選項，又或者待我夏天進一台新型號時測試一下再告訴你。讓我選擇，在同一總預算下，我寧可找台5D Mark II加台平宜點的鏡，而非把較多的錢放在鏡上，因為5D Mark II的低訊噪根本可以把實效速度提升一個光圈以上，你比較一下350D的上限ISO800跟5D Mark II的ISO1600拍出來的效果就知道。

看F4光圈拍攝，疊加 ISO6400x90sec後的效果：
viewtopic.php?f=17&t=551
viewtopic.php?f=17&t=549

看以下的BORG重要訊息：

----- Original Message -----

Savio,

Shortest focal length covering 35mm full format is 77EDII F4.3 at this moment.

We plan to release another 0.65x super reducer for 71FL and 60ED, which covers 35mm full format.

They will be 71FL F3.6 and 60ED F3.7

So 60ED F3.7 is closest configuration you require. I'm not sure this super reducer works with 45EDII. If it does, 45EDII might be a right one. It is a bit slower though.

Its release schedule looks around next May or June.

We also plan to release 1x field flattener.

Ted
----- Original Message -----

> Dear Ted,
>
> may I check with you for one imaging solution.
>
> now we have 7887 & 7704 reducer in hand and have your modified Canon 5D
> mark II, is there any solution for a astrograph at ~200mm focal length?
> not sure if the 45ED lens can work well with the 7704 super ED reducer
> to cover full frame?
>
> because 7866 only cover 30mm imaging circle.
>
> thanks a lot.
>
> Savio Fong

[neodeemer]

Nikon AIS 300/2.8前段时间我的摄影群里有人出
7600RMB，很快出给本地的一个摄友了

[Nebulas]

In Beijing, I saw three the second-hand shop, the price is similar with above.

However, I think choose the 300/2.8 MF lense is not worthy of astro-photography, you mush decrease the size of aperture for correcting focus.It seems the 2.8 amount of the F is waste.

[Nebulas]

I am thinking about to buy a cheap, but good condition MF Nikon 300mm f2.8. What is the approximated street price? Any second-hand shops suggestion? Many thanks!

不懂價格的路過....

但若你是拍星用的，我有另外的建議。

这支镜子在早年拍彗星的作品中看还是比较Popular，台湾的朋友用它的很多。

二手价格上比APM 80的镜子便宜许多。9.5新的镜子，应该在港币五位数上下吧。

我用过早期的镜头，发现和今天的MF镜头还是很难比拟，最近几年还没有大彗星，所以也不是太推荐Willis选择它来拍深空。