2009 December 24th, 11:06
TwoNeil adapter problem?
I just received a TwoNeil adapter from another forum member.
From the first looks of it, it looks strange.
I've attached some images of it showing some problems and confusion:
A picture of the adapter assembled.
A picture of the adapter disassembled and placed in the order that it connects. (each side of each peice is labelled with what kind of connection it has)
2 pictures of the inside from the camera's view when recording. One zoomed out completely (I've brightened it a little so that you can see the inside properly) and one zoomed in a little, just to see the edge of the frame.
My questions are:
Why are there two mounts between the ground glass and focusing screen peices? Is it built correctly?
When I put the adapter on my camera, the screen is noticably more to the left and not placed in an equal position. (as you can see in the images). why would it be like this?
I hope it's just me confused and acting stupid and accidentally got something wrong rather than a fault with the adapter!
Last edited by CryingWindmillFP; 2009 December 24th at 11:21.
2009 December 24th, 15:06
Sorry, just realised I made a mistake in the 2nd picture.
The peice to the far right is not the focusing screen at all. - that's what the ground glass is >.<
Its just the achromat's macro lense lol.
2009 December 25th, 05:53
There is not a problem with the adapter. HV20/30/40's CMOS sensor is not %100 at the middle, thats why it happens (Actually this is HVx0's problem)...
I use a Brevis 35 and it has 3 different adjustment places to solve this issue... I haven't tried twoneil, but you should do some adjustment between the achromat lens and your HVx0...
2009 December 25th, 07:38
But does the distance between the achromat lense and focusing screen matter?
because as you can see in the 2nd picture, the peice that is 1st on the right from the focusing screen peice can just be removed. it doesn't need to be there.
so it would make the adapter made of 3 peices.
Focusing screen > Mount to Ring adapter > Achromat
2009 December 25th, 09:46
The further away the focusing screen to the achromat, the bigger the image will be(magnifying the image) Yes it does matter the distance from the 35mm lens to the screen, this is your focal flange. and in order to acheive infinity focus, you need to have it correct.
2009 December 25th, 20:46
There should be 4-5 cm space between the achromat and the focusing screen... And according to the 4th image; you should zoom more, because HVx0's are actually recording more area than you see on it's 2.7 inch LCD, so you should test it with another monitor connected to HVx0's component out. You should do 1/4 of zoom-in at most. Less zoom means better quality, after you have done your adjustment don't forget to zoom-in till you don't see any black frame around the focusing screen (check with a component out LCD)...