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[Dennisdietz]

High all and happy holidays!
 
I have a focusing screen question that is slightly off topic but I am guessing that many of you will have experience with this, so here goes...
 
It is very common for dSLR users that use old MF lenses to replace

[Rick_oleson]

All split image prisms will black out when the aperture drops below the design limit of the screen - this is usually around f/5.6 or f/8.  I can't speak specifically for the Nikon K3 screen.  Some screens are designed with a shallower prism wedge to del

[Glenn]

Dennis,
I think you have been searching in most of the sites I personally know about - seen your post on one. Some of these sites seem to be inhabited by brain dead idiots, so I would ignore what you read. The telling word in your quoted source is

[Dennisdietz]

Thanks Rick.  To be honest, any aftermarket or replacement screen is better than the stock screen on the D40.  Many people replace with $25 Chinese knockoffs.  These have the lowest quality of all screens used for replacement but are about twice as good

[Dennisdietz]

Thank you Glenn for your input.  I would be buying this from focusingscreen.com which, by all accounts, is second best only to Katzeye, but the price is better.  I would not be buying from any of the countless ebay knockoff places with really cheap

[Glenn]

Dennis,  
Your last post appeared as I was writing mine. I prefer the Canon screen, I have never liked nor used 'in anger' a microprism ring or microprism centre screen. You may find that a bit of experimentation will help you decide, the cost

[Dennisdietz]

Thanks again Glenn.
 
May I ask what you mean by in anger?  As to experimentation, unfortunately at this time I am limited.  One screen will be about $75 (unless I buy the original screen locally and cut it down myself).  Two screens are out of the

[Rick_oleson]

Typically, on any given screen, the split image and microprism will both black out at the same point, as the entire screen will be made to the same specification.  Eye placement is critical when using a split image screen, especially as you approa

[Glenn]

Dennis,
By 'in anger' I mean in my job as a professional photographer, but obviously I have 'looked through' plenty of different screen types. Rick's last post says it all; eye placement can be very critical to get the most out of some sc

[Dennisdietz]

Thanks again Rick and Glenn.  Searching around the net I found two things.  First, http://yipal.blogspot.com/2008/10/fitting-k3-focus-screen-to-d70s.html is

[Glenn]

Dennis,
Found that blog a while ago - sound instructions and method - so you should have no problems. Coincidently; I nearly suggested earlier that you pick up a cheap second hand screen to play with, even if not perfect you will see what actually

[Dennisdietz]

Thanks again.  
 
Near as I can tell from lots of internet searching, all the D40/50/60/70 screens are exactly the same size.  I have asked some forum acquaintances to double check this for me.
 
BTW, does anyone know what the EC-L is made o

[Glenn]

All modern fresnel screens are acrylic formulations. You will find that good quality wet & dry abrasive sheets - use dry -  are the best 'tool' for trimming down to final size. I am fortunate to have a miniature 50mm disc table sander - very cheap

[Rick_oleson]

It depends on how much you need to remove... for small adjustments I lay a flat file on the bench top and slide the screen on it edgewise, rotating 180 degrees periodically and checking often with a caliper to make sure it's staying square as I go.  A

[Dennisdietz]

Thanks Glenn and Rick for the input and sizing tips.  I'm not to worried about trimming the screen as I've been a professional furniture maker for a long time and much of my work involved hand cut joinery, inlays, etc.  My biggest thought is about