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Certainly there are valuable and expensive items I'd not loan. However, the current state of selling on ebay shifts the benefit ratio far from any benefit to me for selling anything less than $500....

I got a couple of email requests for that recently. People's email and user names almost never match, so I wasn't sure if I sent it to you already. PM me with you email and I'll send it.

Trying: https://www.photrio.com/forum/threads/open-letter-to-sean-hosting-darkroom-equipment-pdf-files.180788/

I don't follow portraiture, I think the 20x24 Polaroid stuff is all I can recall off hand seeing in person. On the internet, everything looks to be digitally manipulated so I usually think 'what is...

May help:

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There are some proponents of Delta-X method, but my friendly challenge to see a spreadsheet make the ark as one would do with a compass and find the intersecting point has drawn a blank.
BTW I have...

Just looking at your numbers without the exact calculation, it appears you horizontal angle of view is just a little wider than some normal lens, so a viewfinder for a 35mm lens on a 35mm camera...

The reasearch by Loyd and Jones showed the best correlation between print quality and speed was with a speed point at a tangent of the toe at one-third the gamma (0.3G) line.
This is hard to get...

I have been using the first 10 or 11 steps after 0.1 as my personal "Contrast Index" in all my computations ( a linear regression of those points, exactly). I started using a spreadsheet to do this...

People have been putting iDevices in enlargers for years. I'm not sure this is better to us a camera in stead of an enlarger. I may be missing something of what the device does. Either way, where...

Rolleiflex Hy6 I just got will do that. It is called "Focus Trap" and it can be used with a non-autofocus lens or an autofocus lens set on manual. It monitors focus and when the subject comes into...

I found both devices easy to make process control strips. I do remove the attached step wedge for each device and measure the steps on my own densitometer. They are not exactly spaced at 0.15logD....

Competitor ESECO uses a series of LED lamps with diffusion material:

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This is what the panel looks like when the diffuser and step wedge are removed.
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Flat panel provides very even illumination in a compact device. Very different from the other sensitometers produced.

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Seems about right for that film.

I got results somewhat similar from 8x10 Shanghai film.
...

"objective process" is 98% of this forum :D, why leave development chemistry to chance? I bet Drew doesn't...

No one does any process control or has objective data to show on this issue?

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Not sure what I'm seeing when I download the Jpg. Comes up as a transparency. If it indeed is a negative, the only excess density that might come from water impurity would be the tiny spec in the...

Not sure I understand. Even in one second the moon is pretty blurred. How would that image be made with an 8x10 camera?

Super Wide
Telephoto
Soft Focus
Compact
Extra Long Non-Tele (ULF)

Those are the ones I can think of off hand.

210mm is nice as 190 might be too close to your 150mm and 250mm might be too close to your 300mm.

Maybe somewhere around 150mm. No exact answer because the formats are different aspect ratios.

My ad blocker is detected by YT and won't let me see certain videos, so I was saved from having to see or hear the video link in the original post.

I'd be pretty comfortable thinking every...

I don't know that lens, but if the glass surfaces are cleaner than your 360 Componon, maybe better.

I don't know if it just me, but I have six COMPONON lenses in SILVER barrels and all of them...

When I first saw the Nixon girls photographs, I started taking one self-potriat each year. Didn't have LF 35 years ago, so the negative has always been 6x6cm. Looking back at the prints, first 20...

I'd think the Rosco RED would work. I put this on the lights of my enlarger. It is pretty inexpensive to just buy a roll and try it.

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Camera, focus cloth, Lens & caps, release. Nothing else in the bag. Film holders in a separate bag and meter in my pocket or around the neck. Add in a tripod, car keys and wallet and I'm at my weight...

Maybe more time under the dark cloth to adjust your eyes.

Try focusing with the filters in place.

I think it is pretty easy to tell my 16x20 prints made from 4x5 vs 8x10.

Any format is like driving on the highway. Those going slower than you 'don't know what they are doing' and those going faster are lunatics.

People using formats smaller than 8x10 don't know what...

Wow, I'm impressed!

f11 on a 300mm lens is a bout 27mm
f2.8 on a 50mm lens is about 17mm

So, to answer the question; No. You would need to stop the 8x10 lens down to about f16 to get a similar aperture size.

Today I'll try to calibrate the hole in my 'barndoor' shade for front rise. I have a scale on the front of the camera I can use. With one extra hole, that will give me three working positions. That...

Some nice solutions. Thanks for posting.

I took a photograph of the negative but it does not show well. It shows better on the print. On some other negatives it is more of a box but it is fainter. This print shows it most prominently.
...

I came up with this little solution. I'm loading 8x10 film holders now, and I'll try it out today.

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This looks pretty good. Looks like it can hold a darkslide:

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This is a spin-off thread of a thread on bellows internal reflections. I use a Shen-Hao 8x10 and see that Shen-Hao does make a compendium shade for that camera. Thinking of getting it, but wondered...