Recent content by Reveni-matt

This is one of the things I have not determined yet. Solar UV is around 94% UVA and 6% UVB. UVB is sub-320nm, I'm unsure how sensitive photographic materials are to those short wavelengths. I'm unsure if a meter that can clearly differentiate between 365nm and 395nm is useful or...

Part of my issue is that I need to explore the marketability of such a device, and try to determine why such a thing doesn't already exist in the market. Empirical testing on my part would be less of an issue if I had built the strong sense there is a market for the device. Even if I had...

Hi Alan, these ideas absolutely apply. This meter would be able to meter an instant visible + UV light level as well as a cumulative reading during exposure to allow you to achieve a consistent "dose". The same hardware can measure the transmittance through a piece of film by measuring the...

Thanks for your reply @koraks I wasn't aware of this. I think probably because it's not really described as a meter, more of a process controller, and doesn't appear to be intended for use outside of the darkroom. I was envisioning a handheld device with darkroom features included...

Hi, Matt from Reveni Labs here. I'm interested in designing a light meter for alternative process work, after hearing that the LIGHTMEASURE PPM2 was no longer produced. It doesn't appear there is anything that caters to alt process users specifically. I don't have any experience with...

Moving the objective focus barrel is smooth, there's no issue with adjusting focus when testing a lens. We clearly have a difference of opinions regarding the eyepiece focus stiffness. I'm glad you like it, otherwise.

There is not a graticule, but one can be installed in the eyepiece if you wish. It is not an adjustable eyepiece, so focus on a graticule cannot be adjusted. If you find it would help your eye in some way, you can install one easily. Adjustable eyepieces can be used and must have a graticule...

Hi Dan, I didn't hear back from you after my email reply. I assumed all was well. The movement of the eyepiece has a small impact on the focus of the target on the mirror. I set each one to an approximate focus (good to my eye) and the fit is intended to be tight, as mentioned. Gripping the...

Assembly and calibration are done, most to all of the outstanding orders will ship on Dec 29th. Quantity is limited, order here: https://www.reveni-labs.com/shop/p/reveni-labs-auto-collimator-deposit

Production is underway, hopefully units will start shipping just before Christmas.

While waiting for parts to arrive, I've been working on a collimator that can be used for rangefinder alignment: It has a 131mm diameter lens and 1200mm focal length. Depending on how many orders I get, the price will be around $750 CAD ($532 USD) and shipping around $55 CAD to USA, $95 to EU.

Hi Everyone, I've been slacking on this project for a while, I got burned out on it after having issues with the focusing barrel. I opted for a few compromises: 1. Use an off-the-shelf M42 helicoid to get a quality and reliable focusing mount at a reasonable price at this quantity (and stop...

After some more time, some issues became more clear, that the focus travel was too slow. I designed a multistart thread and ordered a new prototype of the aluminum tube. It works well so far. There was also some issues with the horizontal tubes being wobbly so I printed a two piece clamp...

Hi Everyone, thanks for the support!

Half silvered mirror, 1.1mm thick