Ground glasses - Why are they clipped?

Seeing the lens may be a secondary benefit of the clipped corners but the main reason is to not collapse the bellows upon extention.

 

A bellows is an air pump - remember?

Paul,

 

One of those odd, obscure cameras would be older Linhofs.

 

Most cameras have adjustable shims to properly adjust the gg placement for front or back fresnel placement.

 

If one wanted to change the position of the fresnel then the shims have to be adjusted to maintain proper gg positioning.

Oh,when i took apart the GG for cleaning. I noted that the Fresnel was in front of the GG. Seeing as I still know nuts I simply reassembled it back in the same order. Reading your post Paul,I should the reassemble the GG and Fresnel in the proper order. :) Thanks. Btw I got two backs now. One with a GG and Fresnel, one with a GG only. Still waiting for the lens. Any one know of a good hood to use?

Kenneth

 

What kind of camera you have?

 

I use a compendium shade/hood of toyo which is good as I can calibrate to all type of lenses also hold all of my my filters. The reason I got this set up is because I have a lot's of LF gear and a lot's of lenses in that way i can use it to all of them.

All I had to do is design the adapters to all of my cameras to feet and let my friens make in it for me on the cnc. It were a lots of dining afterward :-)

Frank,

 

I'm using a Toyo/Omegaview 45F. :)

than the shade looks like this and you can use it to any of your future lenses. golds your filter and it's a one time investment.

check it out

 

http://img.inkfrog.com/click_enlarge1.php?image=shade-3.JPG&username=nnylyrd&aid=70321165

LOL sorry I was refering to the blanket (hood) that is used to shield the GG from stray light. :)

AHA, sorry :-)

You mean "dark cloths"? Ebay for used and B&H photo for the new ones. I think the new ones go for a $50 or less.

I have this changing bag which has been decomissioned, the zips died. Reckon if its a good candidate for modding into a dark cloth ? :) Been twiddling my thumbs ever since i bought the Toyo waiting for all the parts to come in.

Be pationed!! :-)

Well if you know a lot's of woman with a sawing mashine probobly one of them could help. :-) But of course it deepens how big is that bag. They coming in different sizes.

The reason ground glasses are clipped is neither to protect the bellows, or to check for vignetting.<p>If any of you has a

story about your bellows being ruined by having an unclipped ground glass, or how not being able to see the corners of

an image while focussing with a wide angle lens is advantageous, I'd be anxious to hear it.<p>The reason the ground

glass is clipped is to protect the shutter blades of either the internal to the camera Packard shutter, or the Copal Sinar

shutter from the air pressure inside the camera.<p>Once you have paid the repair bill of blowing out the shutter blades of

one of these shutters, you'll ask for the ground glass to be clipped, as did my customers at Professional Camera Repair

Service in New York City used to do.<p>Any other benefits of clipping the ground glass are secondary.<p>It's decidedly

not advantageous to be unable to see the corners of the image when composing with a wide angle lens.<p>I don't know

if your camera is Sinar compatible, but most photographers without a shutter internal to the camera, would prefer to be able to see the corners of their images.

It's both to relieve pressure AND see through the corners. If you are using a bellows hood you can check and see if it will vignette you

image without the aid of a loupe

 

Once you stop the lens down to the working aperture it is really tough to get a loupe on the GG to check for vignetting especially in the

tight corners.