Image area of 5x7?

What is the image area of a 5x7 negative? I assume it varies a
little with the holder but I'd love a rough idea. I'm trying to figure out
if I have any chance converting a 4x5 enlarger to 5x7. The throat opening at
the negative stage is only 7" in diameter.

Nick

It's roughly 4 and 5.5/8 by 6 and 5.5/8 square inches.

The diagonal is 8+ inches long (use Pythagoras), so forget about converting
your enlarger to 5x7.

Beseler and Omega enlargers are already pretty bad enough handling 4x5 --
corners are never too sharp or properly illuminated.

To do justice to 4x5 you need a 5x7 enlarger and a decent lens, or perhaps one
of the expensive variable contrast cold light 4x5 heads.

For 5x7 you need...

Cheers,



What is the image area of a 5x7 negative? I assume it varies a
little with the holder but I'd love a rough idea. I'm trying to figure out
if I have any chance converting a 4x5 enlarger to 5x7. The throat opening at
the negative stage is only 7" in diameter.



Bob G

It's roughly 4 and 5.5/8 by 6 and 5.5/8 square inches.

The diagonal is 8+ inches long (use Pythagoras), so forget about converting
your enlarger to 5x7.

Beseler and Omega enlargers are already pretty bad enough handling 4x5 --
corners are never too sharp or properly illuminated.

To do justice to 4x5 you need a 5x7 enlarger and a decent lens, or perhaps one
of the expensive variable contrast cold light 4x5 heads.

For 5x7 you need...

Cheers,



What is the image area of a 5x7 negative? I assume it varies a
little with the holder but I'd love a rough idea. I'm trying to figure out
if I have any chance converting a 4x5 enlarger to 5x7. The throat opening at
the negative stage is only 7" in diameter.



Bob G

It's roughly 4 and 5.5/8 by 6 and 5.5/8 square inches.

The diagonal is 8+ inches long (use Pythagoras), so forget about converting
your enlarger to 5x7.

Beseler and Omega enlargers are already pretty bad enough handling 4x5 --
corners are never too sharp or properly illuminated.

To do justice to 4x5 you need a 5x7 enlarger and a decent lens, or perhaps one
of the expensive variable contrast cold light 4x5 heads.

For 5x7 you need...

Cheers,



What is the image area of a 5x7 negative? I assume it varies a
little with the holder but I'd love a rough idea. I'm trying to figure out
if I have any chance converting a 4x5 enlarger to 5x7. The throat opening at
the negative stage is only 7" in diameter.



Bob G

Bob G wrote:
It's roughly 4 and 5.5/8 by 6 and 5.5/8 square inches.

The diagonal is 8+ inches long (use Pythagoras), so forget about converting
your enlarger to 5x7.

Beseler and Omega enlargers are already pretty bad enough handling 4x5 --
corners are never too sharp or properly illuminated.


I've got an older Beseler. Last time I talked to Beseler they told me
none of the current 4x5 light sources are big enough for my 4x5. They'd fall
down the mounting hole without some sort of adaptor-) They sell an 8x10
upgrade kit but it's about $3k. The upgrade kit is what's got me wondering
about trying to fit a larger light source.

Thanks
Nick

Bob G wrote:
It's roughly 4 and 5.5/8 by 6 and 5.5/8 square inches.

The diagonal is 8+ inches long (use Pythagoras), so forget about converting
your enlarger to 5x7.

Beseler and Omega enlargers are already pretty bad enough handling 4x5 --
corners are never too sharp or properly illuminated.


I've got an older Beseler. Last time I talked to Beseler they told me
none of the current 4x5 light sources are big enough for my 4x5. They'd fall
down the mounting hole without some sort of adaptor-) They sell an 8x10
upgrade kit but it's about $3k. The upgrade kit is what's got me wondering
about trying to fit a larger light source.

Thanks
Nick

Bob G wrote:
It's roughly 4 and 5.5/8 by 6 and 5.5/8 square inches.

The diagonal is 8+ inches long (use Pythagoras), so forget about converting
your enlarger to 5x7.

Beseler and Omega enlargers are already pretty bad enough handling 4x5 --
corners are never too sharp or properly illuminated.


I've got an older Beseler. Last time I talked to Beseler they told me
none of the current 4x5 light sources are big enough for my 4x5. They'd fall
down the mounting hole without some sort of adaptor-) They sell an 8x10
upgrade kit but it's about $3k. The upgrade kit is what's got me wondering
about trying to fit a larger light source.

Thanks
Nick

You might be able to use kind of a square funnel shaped adapter and a cold light
sorce, but I do not thing you could do 5x7 directly as the diagonal is 8+ inches.

Nick Zentena wrote:

What is the image area of a 5x7 negative? I assume it varies a
little with the holder but I'd love a rough idea. I'm trying to figure out
if I have any chance converting a 4x5 enlarger to 5x7. The throat opening at
the negative stage is only 7" in diameter.

Nick

You might be able to use kind of a square funnel shaped adapter and a cold light
sorce, but I do not thing you could do 5x7 directly as the diagonal is 8+ inches.

Nick Zentena wrote:

What is the image area of a 5x7 negative? I assume it varies a
little with the holder but I'd love a rough idea. I'm trying to figure out
if I have any chance converting a 4x5 enlarger to 5x7. The throat opening at
the negative stage is only 7" in diameter.

Nick

You might be able to use kind of a square funnel shaped adapter and a cold light
sorce, but I do not thing you could do 5x7 directly as the diagonal is 8+ inches.

Nick Zentena wrote:

What is the image area of a 5x7 negative? I assume it varies a
little with the holder but I'd love a rough idea. I'm trying to figure out
if I have any chance converting a 4x5 enlarger to 5x7. The throat opening at
the negative stage is only 7" in diameter.

Nick