Enlarging negs bigger than 8x10

[Craig]

Focus stack stitching?

It's a way of avoiding depth of field problems. As an example, take 3 photos, one focused on the foreground, on on the mid range and one on the far away elements. Stitch them together and you have a single image that is completely in focus from the closest to the furthest away. It avoids diffraction from stopping down, and even then you might not be able to render everything in focus with a single shot.

 

[Andrew O'Neill]

It's a way of avoiding depth of field problems. As an example, take 3 photos, one focused on the foreground, on on the mid range and one on the far away elements. Stitch them together and you have a single image that is completely in focus from the closest to the furthest away. It avoids diffraction from stopping down, and even then you might not be able to render everything in focus with a single shot.

Oh... kind of like taking 3 sheets of film and exposing one for the shadows, one normally, and one for the highlights? Interesting... Thanks!

 

[sepiareverb]

4x5 Technical film might be a decent compromise. More DOF possible.

 

[blindpig]

ic-rtacer,
That's terrible coverage your light source is giving you I've used the same type 8X10 enlarger with diffusion head as well as condenser heads and even custom made lamp house and never saw coverage as poor as you seem to have.Sure think you ought to check it out.That being said in my experience equipment used for lithographic separation work needed to be critically sharp and evenly lit from edge to edge.
Check it out and good luck....
Don

 

[blindpig]

Jarin,
This may not be possible for your situation but once we had a need such as you describe and arranged to lease the proper lens for the required enlargement as only need it for the one time Fortunately there was two adjacent rooms that could be darkened so the lens was put through the wall between them and a lamp house was constructed and mounted on wheels inline with the lens.in the other room a movable partition was mounted on wheels so the image was projected from one room to the other" Rube Goldberg"for sure but worked for us.
Just a thought....
Dom

 

[ic-racer]

ic-rtacer,
That's terrible coverage your light source is giving you I've used the same type 8X10 enlarger with diffusion head as well as condenser heads and even custom made lamp house and never saw coverage as poor as you seem to have.Sure think you ought to check it out.That being said in my experience equipment used for lithographic separation work needed to be critically sharp and evenly lit from edge to edge.
Check it out and good luck....
Don

Yes, I can't believe they were actually using that. My suspicion is that when the lamp was new it was better. About ten years ago I had a thread over at Large Format Forum on how I improved it, but that head is long gone. The guy that bought it put a new lamp in it. I'm using a CLS2000.

 

[Juan farrias]

First of all I do 11x14 in glassplates . My glass is from 11x14 inch document picture frames from Dollar tree stores.I make positive and negative emulsions.for the last 15 years i have made many be wooden cameras. I also make bellows. The last camera I made was a reflex camera.it uses a front surface mirror 18x18 inches that reflects the image up. There i slide in a pale green focusing screen a drop of green dye in gelatin makes viewing the imageuch easier. I love Russian lomo lenses I do have two 760 nikkors but the 600m lomo and a 345 mm f4/5 lomo is on my camera and the same lens in on my big frame to enlarge the glassplates..that lens is reversed and situated in the same structure looking at the backlighted glassplate that lens can move to and fro as I focus on the enlargeing focusing frame to moves 3 to 5 feet depending on size of murals 3 times enlargement or 4 times enlargement also equals no grain with old time slow emulsions. My camera is not small I use glass . I make everything even my 3 legged tripod is unique..i have in many photolabs used all kinds of equipment. But everything I have is constructed from wood materials I found in the hot dry dry desert .that old wood takes a stain nicely and my stuff looks like something from the past.
8x10 is the limit .fast film may save the day poor equipment but my slow asa of 3 to 5 must sit on a unmovable force

 

[Juan farrias]

Also forgot to mention how to illuminated my glassplate. As it is located a certain distance from the 345 mm lomo lens that will projet it to the huge movable focusing board.the glassplate has to be back lighted. While my glassplate sits in it's location 6 inches away from the negative I drilled 230 small 5 mm holes on a 16x16 inch 1/4 thick plywood I think I used 5/8 squares think I sound up with 230 holes the 5mm super bright LED"s I purchased on eBay .I believe the LED's came with limiting resister .voltage to all was 12 volts .total current was little more than onr amp..after wireing and dying to see my invention I hooked it up .holy cow itback lighted my glassplates brighter than any 8x10 enlarger.save this info it's all figured out for you guys

 

[Juan farrias]

First of all I do 11x14 in glassplates . My glass is from 11x14 inch document picture frames from Dollar tree stores.I make positive and negative emulsions.for the last 15 years i have made many be wooden cameras. I also make bellows. The last camera I made was a reflex camera.it uses a front surface mirror 18x18 inches that reflects the image up. There i slide in a pale green focusing screen a drop of green dye in gelatin makes viewing the imageuch easier. I love Russian lomo lenses I do have two 760 nikkors but the 600m lomo and a 345 mm f4/5 lomo is on my camera and the same lens in on my big frame to enlarge the glassplates..that lens is reversed and situated in the same structure looking at the backlighted glassplate that lens can move to and fro as I focus on the enlargeing focusing frame to moves 3 to 5 feet depending on size of murals 3 times enlargement or 4 times enlargement also equals no grain with old time slow emulsions. My camera is not small I use glass . I make everything even my 3 legged tripod is unique..i have in many photolabs used all kinds of equipment. But everything I have is constructed from wood materials I found in the hot dry dry desert .that old wood takes a stain nicely and my stuff looks like something from the past.
8x10 is the limit .fast film may save the day poor equipment but my slow asa of 3 to 5 must sit on a unmovable force

 

[Juan farrias]

First of all I do 11x14 in glassplates . My glass is from 11x14 inch document picture frames from Dollar tree stores.I make positive and negative emulsions.for the last 15 years i have made many be wooden cameras. I also make bellows. The last camera I made was a reflex camera.it uses a front surface mirror 18x18 inches that reflects the image up. There i slide in a pale green focusing screen a drop of green dye in gelatin makes viewing the imageuch easier. I love Russian lomo lenses I do have two 760 nikkors but the 600m lomo and a 345 mm f4/5 lomo is on my camera and the same lens in on my big frame to enlarge the glassplates..that lens is reversed and situated in the same structure looking at the backlighted glassplate that lens can move to and fro as I focus on the enlargeing focusing frame to moves 3 to 5 feet depending on size of murals 3 times enlargement or 4 times enlargement also equals no grain with old time slow emulsions. My camera is not small I use glass . I make everything even my 3 legged tripod is unique..i have in many photolabs used all kinds of equipment. But everything I have is constructed from wood materials I found in the hot dry dry desert .that old wood takes a stain nicely and my stuff looks like something from the past.
8x10 is the limit .fast film may save the day poor equipment but my slow asa of 3 to 5 must sit on a unmovable force

 

[Juan farrias]

I am old and so forgetful my lens in my 11by 14 inch glassplate camera is not the 345 mm lomo ,,it is the 600 mm lomo .hope the administrator allows my correction .

 

[Peter Schrager]

I am old and so forgetful my lens in my 11by 14 inch glassplate camera is not the 345 mm lomo ,,it is the 600 mm lomo .hope the administrator allows my correction .

I'm not the moderator but you are forgiven!!