Jonny Have a look at http://www.sgpro.co.uk/


Russ

I believe the Sony A1 is like the HC1 here is a picture of my HC1 with the letus35 mini and cavision rods and HC1/A1 spacer.

http://www.pabstfilms.com/pics/hc1-letus35mini.jpg

Strictly speaking, apart from what the lens is doing in terms of magnification, an Achromat is two elements (made of two different glass types), cemented together.

If we think of white light as being composed of red green and blue. Going through a single element, the refractive index is different for the red green and blue portions of the light, leading to those portions of the light focusing at slightly different points on the other side of the lens. (colour fringing)

Using an achromatic lens is a way of compensating for the differences in refractive index for the different wavelengths.

diy vs. redrock etc.
 

hi, I'm using the redrock with the xl-h1. i have built a lot of my own eqip., i made my own matte box, track system and stabalizing system. Im happy with all of them. but i spent the money on the redrock after taking these things into consideration.
1. can i build a device that will keep out all dust?
2. how much will all the parts cost?
3. how much will it cost to rebuild if my first attempt fails?
4. will my build be functional with all the lenses i want to use?
5. can i design something that can be quickly repaired if any part fails?
with my other creations, building it myself was cost effective and easy. But i felt that, being in a professional environment it was not going to be cost effective to design my own dof adapter. this is just my opinion. lots of luck

acromat
 

just thought i would simplify. the d.o.f. acromat is the eqivalent to a magnefying glass for you camera. it helps the camera focus on the adapters extremely-close-to-the-lens screen.

Here are Century examples:

http://www.schneideroptics.com/ecomm....aspx?CID=1081