Pentax PF-100ED 觀鳥鏡 $3,000
WhatsApp Julian 98333004
2016年購入, 原作海外觀星用途, 可惜配上天頂棱鏡後便不能合焦。
只在香港用過三次觀星(直望, 沒接天頂棱鏡), 星點在視場邊也非常銳利!
小弟沒有觀鳥, 所以此鏡長期置閑防潮柜內。部分外皮包膠有退色現象, 但光學部分完好。
此鏡有伸縮遮光罩, 亦有原裝鏡袋。它能接1.25”目鏡, 以旋扭式鎖上, 非常方便。
[Sold] PentaxPF-100ED觀鳥鏡
[Sold] PentaxPF-100ED觀鳥鏡
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最後由 julian 於 週四 27 8月, 2020 23:01 編輯,總共編輯了 1 次。
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- 星際雲
- 文章: 10
- 註冊時間: 週六 07 10月, 2017 19:57
Re: PentaxPF-100ED觀鳥鏡
About the focus problem, I think the focus plane is inside the pentax eyepiece tube. Can you try to use a barlow (acts as relay lens) to extend the focus point out of the tube end ? You can try to put a barlow in-between the telescope end and diagonal so that the focus point will be extended out to the diagonal, and possibly make focus. The barlow must be in front of diagonal. Would you try if this is possible. Of course, the image quality may be degraded slightly by the barlow.
Tommy Wong
Tommy Wong
Re: PentaxPF-100ED觀鳥鏡
Thanks Tommy. Someone has also suggested the same few years ago. But I do not want to sacrifice its native short focal length which means wide field. Yes, degradation is my another concern. And now I got a Borg 125SD so I don't need this spotting telescope anymore.
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- 中子星
- 文章: 1692
- 註冊時間: 週日 11 9月, 2005 01:34
Re: PentaxPF-100ED觀鳥鏡
係大黃傻貓GARFIELD 寫: ↑週二 25 8月, 2020 19:51兩支係唔同嘅?
http://hkastroforum.net/viewtopic.php?f ... ax#p311525
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