Focusing Screen
- Thread starter ReneH
- Start date
Postmaster
Dark Side of the Camera
Here ya go: http://www.astroselbstbau.de/
O.K. this is in German (of course) so you have to scroll down to the lower third and click on:
"Mattscheibe besonders feinkörnig und hell - Faserplatte aus Lichtleitern"
You can write that guy a mail to order: manfred.pieper@t-online.de
Frank
O.K. this is in German (of course) so you have to scroll down to the lower third and click on:
"Mattscheibe besonders feinkörnig und hell - Faserplatte aus Lichtleitern"
You can write that guy a mail to order: manfred.pieper@t-online.de
Frank
zcream
Well-known member
Hi mate! I have just sent Manfred an email about the fiberscreen. Appreciate your input a lot..
Just wondering what screen holder you used and which one of these fiber boards you bought ?
Fiber board
octagonally 30x30 mm, h = 2.0 mm for Unit price 15,-- € Fiber board
octagonally 36x39 mm, h = 2.0 mm for Unit price 30,-- €
Thanks!
Just wondering what screen holder you used and which one of these fiber boards you bought ?
Fiber board
octagonally 30x30 mm, h = 2.0 mm for Unit price 15,-- € Fiber board
octagonally 36x39 mm, h = 2.0 mm for Unit price 30,-- €
Thanks!
Postmaster
Dark Side of the Camera
I got the bigger one.
For the holder use a modified filter ring (Without the glass)
Frank
For the holder use a modified filter ring (Without the glass)
Frank
Postmaster
Dark Side of the Camera
That backfocus issue was driving me nuts.
So I sloughtered one of my old Zeiss Lenses and used the housing - verry elegant micro collimation now hehehe (picture 1)
The components: +10 Achromat in a tube, Zeiss housing with ARRI GG and my trusty Petri 1.7/50 Prime (picture 2)
As you can see I have to hold everything by hand. (picture 3)
This is not represantative since nothinmg is lined up in the propper angles, light drops in and what not but it gives you an idea of no visible grain in an static adapter. ( Picture 4)
With a housing that helds everything together it would give a marvelous picture.
You can see a grid on the ARRI screen - that is dependand of the light angle.
If you got it 100% square to the HVX lens it disapeers.
Frank
So I sloughtered one of my old Zeiss Lenses and used the housing - verry elegant micro collimation now hehehe (picture 1)
The components: +10 Achromat in a tube, Zeiss housing with ARRI GG and my trusty Petri 1.7/50 Prime (picture 2)
As you can see I have to hold everything by hand. (picture 3)
This is not represantative since nothinmg is lined up in the propper angles, light drops in and what not but it gives you an idea of no visible grain in an static adapter. ( Picture 4)
With a housing that helds everything together it would give a marvelous picture.
You can see a grid on the ARRI screen - that is dependand of the light angle.
If you got it 100% square to the HVX lens it disapeers.
Frank
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leteeci
Well-known member
Hehehe.. Good one!
rogar-Happy(DBG):Looks very promising! Not so sharp, but I guess it is from jpeg compression and all other lights that are falling into groundglass..
Thanks Frank!!!
Postmaster
Dark Side of the Camera
Yeah, I need someone with a lathe to make me a housing.
It was pretty hard to hold everything in the (almost) right position/angle/distance and make a screenshot with the other hand (with OnLocation).
As you can see at the noise there was not much light eather. Just the desk lamp in my office.
But I´m still amazed that this is the first GG without any grain at any stop. I know there is the gel GG from Movietube but it looses much more light.
Frank
It was pretty hard to hold everything in the (almost) right position/angle/distance and make a screenshot with the other hand (with OnLocation).
As you can see at the noise there was not much light eather. Just the desk lamp in my office.
But I´m still amazed that this is the first GG without any grain at any stop. I know there is the gel GG from Movietube but it looses much more light.
Frank
zcream
Well-known member
OK. I asked my pretty German girlfriend to call up Manfred and ask him for the 36x39mm fiberscreen. He is not too keen on English so we translated via her. Anyway, he says that all of his fiber screens have little black points (??) Maybe that means smudge marks, maybe dead fiber ends that will act like a black spot.
Frank, I am keen on trying these out - just wondering if you actually got a perfect piece for yourself - one with no "black spots" ??
Frank, I am keen on trying these out - just wondering if you actually got a perfect piece for yourself - one with no "black spots" ??
Postmaster
Dark Side of the Camera
"Yeah, I need someone with a lathe to make me a housing."
Do you have a cad drawing with the correct measurements?
Thanx for the offer, but as you can see I live in Germany and I have a friend make it for me localy.
@zcream
I think they are surplus or "not perfect enough" for ARRI.
Mine is chiped at the corner (not critical area) and is not a perfect hexagon.
But I have no spots at all - maybe sheer luck.
Frank
touloumpas
New member
Any progress/screenshots with your fiberscreen?
Postmaster
Dark Side of the Camera
I´m workin on it.
I had a hard time to figure out the right distances between Achromat, GG and lens, regarding CA, corner sharpnes and vignetting but I think I nailed it.
Looks pretty promising.
I´m waiting for my machine shop to return the housing so I can do some test shots.
@zcream no, but i found 2 sites that got a load of alternativ diffuser screens and other intersting optics for adapter builders - so that may be an alternative.
In the momement I´m happy with that fiber screen.
http://www.edmundoptics.com
http://www.thorlabs.com/Navigation.cfm?pageRef=8
Frank
I had a hard time to figure out the right distances between Achromat, GG and lens, regarding CA, corner sharpnes and vignetting but I think I nailed it.
Looks pretty promising.
I´m waiting for my machine shop to return the housing so I can do some test shots.
@zcream no, but i found 2 sites that got a load of alternativ diffuser screens and other intersting optics for adapter builders - so that may be an alternative.
In the momement I´m happy with that fiber screen.
http://www.edmundoptics.com
http://www.thorlabs.com/Navigation.cfm?pageRef=8
Frank
touloumpas
New member
I ordered 2 fiberscreens from Manfred for testing.
I have also found some intersting optics commercial and experimental at :
http://www.anchoroptics.com
I ordered one Achromat, one GG (diffuser) for my DIY DOF adapter and two Tapered Right Angle Porro Prisms for my future plans to make a flip module.
I have also found some intersting optics commercial and experimental at :
http://www.anchoroptics.com
I ordered one Achromat, one GG (diffuser) for my DIY DOF adapter and two Tapered Right Angle Porro Prisms for my future plans to make a flip module.
zcream
Well-known member
Here is a response from Manfred in German - English translation below :-
>>>>>
German :-
es gibt leider keine ganz einwandfreien Faserplatten, auch nicht in dem
KB-Format. Ich kann das leider nicht ändern. Sie sind nicht der Erste, der
diesen Wunsch hat. Alle haben diesen Wunsch. Letztendlich kaufen viele diese
Platten und kaufen sogar nach. Wie man mir sagt, machen es einige mit
Rotation, andere mit Vibration.
>>>>>
English
>>>>>>
Unfortunately, there is not a proper fibreboard, not even in the
KB format. I can unfortunately not be changed. You are not the first to
This desire. They all have that desire. Ultimately, many of these buy
Sheets and even buy. As you say, do it with some
Rotation, others with vibration.
Unfortunately, I can no better message to send.
>>>>>>>
Leider kann ich Ihnen keine bessere Nachricht zukommen lassen.
>>>>>
German :-
es gibt leider keine ganz einwandfreien Faserplatten, auch nicht in dem
KB-Format. Ich kann das leider nicht ändern. Sie sind nicht der Erste, der
diesen Wunsch hat. Alle haben diesen Wunsch. Letztendlich kaufen viele diese
Platten und kaufen sogar nach. Wie man mir sagt, machen es einige mit
Rotation, andere mit Vibration.
>>>>>
English
>>>>>>
Unfortunately, there is not a proper fibreboard, not even in the
KB format. I can unfortunately not be changed. You are not the first to
This desire. They all have that desire. Ultimately, many of these buy
Sheets and even buy. As you say, do it with some
Rotation, others with vibration.
Unfortunately, I can no better message to send.
>>>>>>>
Leider kann ich Ihnen keine bessere Nachricht zukommen lassen.
zcream
Well-known member
The thorlabs and Optosigma did not get as good a rating as the Canon EE-a. Some people tested these a couple of years ago..
touloumpas
New member
To postmaster:
The black spots in your pictures are in you lens, or in your fiber board?
The black spots in your pictures are in you lens, or in your fiber board?