[C4040Z]

什麼叫----黑角?

[vaworld]

相片上四角其中任何一隻或多於一隻角比中間部明顯為暗, 多數發生在 Wide Angle, 通常越 wide 越明顯, 原因可能係鏡頭設計問題或者用了不當 filter 或蔗光罩.

[C4040Z]

咁用了 wide angle 係唔係唔好用蔗光罩呢?

[vaworld]

用專用嘅 OK, 同時盡量唔好用兩塊 filter, 保護鏡要用薄一 d 或者專比 wide angle lens 用嘅. 用cpl 鏡亦最好係用專為 wide angle嘅

[aaadc]

咁點樣知道邊隻保護鏡for wide angle呢

偏光鏡又有冇特別for wide angle呢?

[vaworld]

>>咁點樣知道邊隻保護鏡for wide angle呢

偏光鏡又有冇特別for wide angle呢? <<

As i know there are not so many manufacturer producing specialised filter for wide angle, B+W is one of those manufacturer.

The ring of filter is narrower is better, like nikon is so good or u may ask camera shop keeper.

Yes, there are specialised 偏光鏡 for wide angle and this more important than protection filter because PL/CPL filters are normally thicker than normal filter. But those specialised PL filters are expensive. You may use larger size PL/CPL filter and use a converter ring to screw to ur lens. e.g. 72mm PL filter to 52mm(filter size) of lens. It is very good alternative method.

[aaadc]

dear vaworld,

Thank you, what is the price of a specialised CPL? How would you comment on the effectiveness of using a large size CPL, for the purpose of eliminating the black angle, compare with the specialised CPL?

[vaworld]

aaadcfever:

Sorry, i don't know the prices.

The larger cpl is also quite effectiveness comparing with specialised one but a larger cpl may also somehow more expensive than smaller one but it can be used for several lenses with different filter size with adapter ring.

As my experience, a 24/28 mm lens(135mm) using ~15mm more in size is quite enough, i.e. 67mm to 52mm or 72mm to 58mm. 20mm(135mm) or wider lenses may need to test before u actually use. Removed ur protection filter before using pl/cpl will reduce the possibilities of "darken edges".

OR u may consider to buy a extra large cpl for suitable more lenses i.e. 82mm.