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Bloom? If you mean the natural tarnish that sometimes forms on old lenses and behaves like a natural coating, I haven't noticed that when looking at reflections of light sources on the surfaces.
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With my series I Velostigmat, I've never noticed any flare, but then I've never used it with the sun if front of the camera. I've also never noticed any loss of contrast except when the lens was wide...

The 1A Raptar was a copy of the VIIa Protar, identical. The earlier series I Velostigmat had 8 elements in 4 groups like the Cooke XV, but the cemented doublets were much thinner.

The following...

I have a Betax #4 and a Optimo #4 sitting here. Both carry lens cells of roughly the same aperture for 8X10.

The lens cell threads in the Optimo are larger diameter than the Betax. However, the...

Just out of curiosity, does anyone know what the dark slides from nearly century old wood and metal film holders were made of?

Would it be possible to glue a thin piece of black flocking material to whatever it is you're trying to paint?

That's the standard clamp screw in a surveyor's tripod head. That's why I buried a 5/8 x 11 nut in the platform mounted on mine.

Another vote for the surveyors tripod. You can get them at places like Home Depot and Lowes. I posted about an adapter platform for mine that supports the whole camera. Very stable and steady.
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Finally, the images at f64. Detail near the center is about the same as f22, some out of focus elements near the edges of the negative are in better focus here.

181974181975


I think these...

Next up are the two images at f22. First is the detail inset, second is the whole image. If you look carefully, you can see the louvers in the evaporative cooler and the roof vent. They're a bit more...

Set up the camera and exposed three paper negatives, wide open at about f8, f22, and f64. The combined focal length of the two lenses at their spacing is about 14 inches, but haven't measured it...

Several years ago I bought a number of meniscus lenses from Anchor Optical to experiment with making a periscopic lens for my 8X10. One pair seemed promising, marked 1.5 diopter. Two of them would...

Incidentally, a pneumatic bulb isn't required to fire the shutter, but its use will reduce vibration if used carefully. The shutter is a rebranded Wollensak "Regular" shutter. I have a couple of...

My second 8X10 camera purchase came with no lenses but two pinholes. One was a standard pinhole, the other was a 1/4" (6 mm) hole. The bigger hole gave a very fuzzy image, but let in enough light in...

I don't have that particular lens, but based on similar lenses I do have, it should cover 6-1/2 X 8-1/2 and give reasonably good definition in the corners at f22 and smaller.

It will easily...

I had a similar experience with Kodak High Speed Green X-ray film. In 2012 I made four exposures of a scene and developed three of them over the next few days. The fourth sheet stayed in my paper...

I believe the Conley series V is a rebranded Wollensak Velostigmat series I. You have an early one. The later ones were f6.3. The series I has good coverage. Wollensak claimed in their catalogs it...

I have two series I Wollys, one f6.8, the other f6.3. Like yours, my f6.3 is symmetrical, both cells have the same focal length.

I think the f6.3 lens is completely satisfactory for my needs. The...

The Wollensak catalog at Camera Eccentric says it will cover 5X8

172342

That 14 second exposure didn't catch the ghosts because they were floating around... ;)

I have a couple of process lenses, but am hardly an expert. Many use process lenses when they want a longer than normal focal length for their format. Most process lenses have a fairly narrow field...

I use FreeBSD, which is somewhat similar to Linux. There is an app called Gimpshop which is Gimp configured with a user interface similar to Photoshop, for users familiar with Photoshop.

Don't...

Before the exposure question can be answered, it's important to know whether the RC paper is variable contrast or graded. VC paper with a yellow or green filter can probably hold more stops than when...

I wouldn't give up on paper so soon, especially if you must scan because of lack of space for a darkroom.

I've had good results scanning paper negatives with an ordinary flatbed scanner and...

169166Just for historical purposes, the f9.5 wide angle is a very old design, but not necessarily bad. It was introduced by the Rochester Lens Company as the Royal Anastigmat Wide Angle around 1902....

Here's a diagram of the Royal Anastigmat from a German photographic annual from 1903. The cemented interface in each group is hard to see. I have taken apart both of my series I Wollys for cleaning,...

Yes, the series I is the Royal Anastigmat renamed. Each cell has two cemented doublets separated by an airspace. The only other commercially produced LF lens with the same arrangement is the Cooke...

Interested in details on your homemade lens.

Kremer Pigmente in Germany sells Canada Balsam as an art product. It may be the raw resin which must be dried over low heat and redissolved in xylene to use as a lens cement.

However the product...

If you follow the link I posted, it goes directly to the info page, and I can view catalogs and their pages. Trying to get to the info page from the front page doesn't work. I tried that first.

Go to the Wayback Machine (Internet Archive) and plug in the following URL:

www.cameraeccentric.com/info.html

Click on one of the snapshots. Was able to bring up one of the Wollensak catalogs...

I don't know if this is the place for members to post data on their random Suter lenses, but here is the information on mine:

E. Suter Basle
No 4079
Aplanat B No 5
13 x 11

Rough measure of...

DrTang, here is the aperture scale of the Turner Reich Triple.

The outer scale is both cells combined, the middle scale is the 19.7" cell, and the inner scale is the 25" cell. The inscription...

I have two Wolly series I lenses for 8X10, but one was missing its aperture scale and the other has only a single scale. It's interesting your lens is an f6.8, as that would make it a very early one....

I would be the last to argue with the Vade Mecum, but I was under the impression that the Portrait Series A was a Petzval. Hopefully someone who owns one and has disassembled it for cleaning could...

I have a Baco 4X5, and after doing some troubleshooting discovered the back was not compatible with standard 4X5 holders. I guess it was designed to work with proprietary Baco holders. After doing a...

Post in haste, repent at leisure...

The RR had beautiful glass, like new, and the cemented doublets were pretty thin. Most of the difference in meter readings was probably due to loss from...

Several years ago I saw a post at another photographic forum, I think the poster was Richard Knoppow, stating that the optical glass made before world war two was "filthy" by modern standards.
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Thanks, Dan!

That narrows it down pretty well.

Yup. If an older blood pressure cuff can't be found, new replacement bulbs for these can be bought cheaply on Ebay. I got mine for about 6 USD and a few dollars shipping, don't remember the exact...