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- 四川省 成都市
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- 2012-2-10
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发表于 2012-11-20 18:43
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本帖最后由 梦罗浮 于 2012-11-22 17:39 编辑
cosmicarPentax 8-48mm f 1.0镜头修改,据说改屁股除了能纠正法兰距过短，让f1.0~f4之间的光圈任意焦段可以合焦以外，还有就是可以不用开远摄功能而是用32-150mm焦段，但有轻微暗角
作者原话，哪个高人大大来翻译下，他说的什么？
hello,I am now going to show you how to easily modify the pentax 8-48 vs f1.0 under system m4\3
so looks like the lens is the modified
invented by me,the adapter allows you to change the minimum focus distance of the lens during filming for fixing the minimum distance at a comfortable focus is the bolt that is convenient fix the situation
so you can use this lens as a macro,not tinkering with it every time,but simply releasing catch,pull,or drag a bit like a trombone
in the normal position when the lens is infinite,it has a minimum focusing distance of about 1 meter,it is inconvenient when shooting,and can be easily solved by the construction of my adapter
Now I`ll show you what it looks like the adapter of my designs
adapter can be easily disassembled and has a very simple device
adapter consists of a shank of the lens which put on dural ring
it is easy to carve on a lathe from duralumin or aluminum pipe,but from the dural it will be stronger and more durable（made of aluminum,I did not)
Here`s a piece of this is obtained by a ring
internal diameter from one side to match the outer diameter of the end of the lens removed from the shank
ring should fit snugly to the very end of the lens so that there was no backlash and move it to the lens was smooth,with a slight effort
the reverse side of the ring can not be wearing.Because the back side of the ring corresponds to the inner diameter of the outer diameter of the limit switch of the lens
thickness of the lens and the trailer is the length of the distance to which it is necessary to fix the ring
well at this point the inner diameter of the ring must match the outer diameter of the lens liner
the lens was originally made for other tasks and its modifications under the M4\3 it is necessary to prepare
the end of the lens should be shortened on a lathe.the length of about 2-3mm ,need to be cut very slowly
and akuratno until until the groove is barely noticeable
it`s not as scary as you might imagine.After this procedure,you can unscrew the rear lens of the lens
aperture to look at and examine the internal structure of the lens,if you are interested in
I do not recommend it often,but to satisfy the interest of the lens unit can be
Now you need to look closely and try to understand what are the main features
This is the shank of the lens that you can unscrew the lens before the lens to shorten
This objective should be to cut the shank of the same length(about 2-3mm)on which you shortened the end of the lens itself.
in the shank of the lens are three screws that fix the shank on the lens
These need to unscrew the three screws,drill down and screw on the inside
screws must be shortened as well.approximately 1 mm from the acute side.they must be screwed into the shank of the lens and it is completely without looking beyond it. This is for the subsequent fixing the liner inside the ring
screws should be in the body of the shank and not to disturb him at the end of worn lenses
this is a very important point, because you can build the entire structure,and then not being able to set it up because of the fact that these three screws will interfere
in the ring with one hand,you insert the shank,which must be very tight to enter the ring
if the screws will interfere with their need to unscrew
Now on the shaft adapter can be screwes,"C-mount to M4\3"
C-mount adpapter shall fit snugly to the ring and liner,respectively,the shank should be sunk deep into the rings on their entire length,After that,the inside needs a little fix with three screws,but not much! so as not to distort the geometry of the ring
so we get a unique tool for shooting in normal conditions and in almost complete darkness.In addition,this lens can now be used for macro and aperture of 1.0 will give you a unique opportunity
To assess the uniqueness of this lens can be as soon as you need to fall to the night report.Its focal length 8-48 to GH2 vs mode 2X(not EXT mode) are transformed int 32-192.which markes it possible to stupendous filming in almost complete darkness in the ISO 6400
In the process of creating an adapter was broken a few lenses-you can make a financial support in its sole discretion for further work in this area,please contact me at practic@list.ru
And on my site GH2HD.com you can get the lates information regarding the shooting an the GH2 and tests of other lenses on M4\3 Thank you!
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发表于 2012-11-20 18:02
最近玩CCTV镜头的还真多
