Recent content by Matt Hall

Been a while since I posted to my original comments but I have just had a breakthrough which lends a LOT of information as to where this might have happened. 1. As for all the ideas that I used an LED torch, or similar, that would have created a blank unexposed area on the outside edge of the...

Some of you seem to be missing the point of this exercise. I have attempted to build a completely new camera using an older aerial lens. I am not trying to get the perfect portrait of the night sky but just see if I can get this beast to work again. I have been shooting the night sky for 40...

Also, as far as the equipment I am using and the optics, I have attached a few photos to illustrate. I have custom built a 4x5 film astrograph camera using a Kodak Aero Ektar 305mm f/2.5 lens. I have exposed many sheets of color negative and transparency film and never seen this happen before...

First of all, let me correct a statement from my previous post. After calling the lab to confirm the processing details I discovered that they process at 20C not the 22C as I stated. I also confirmed that they use D-76 developer at the stock dilution. As for processing myself, I used to do that...

Maybe that is the problem. The film was loaded emulsion side down and the light through the base caused some scattering effect?

The box looks authentic to me. Here is the box and a close-up of the sticker.

No, I had several planes fly through the scene during the exposure and they don't even show up. Sirius is the brightest star in the sky and it is just a speck on the film. To create something as intense as this exposure was would have required flashing a light almost directly into the lens...

I exposed some of this Rollei 4x5 B&W Infrared 400 film through my astrograph camera. I shot the Orion Nebula and surrounding H-alpha regions. It was a tracked exposure, 30 minutes @ f/2.5 and I used a Wratten #25 red filter to record approx 600nm and above on the film. I had my lab process in...

As for the type of UV bulb I used, it was the following I found on Amazon: SANSI 5W LED Black Light Bulbs, A15 E26, 320-400nm I wanted something low wattage so not to introduce any heat into the lens cell. That might account for how long it took to clear. Now for the IR filter and Rollei film...

No thanks. I do not have the original camera any more. I have constructed my own astrograph camera using this lens and 4x5 film. It attaches to my German equatorial clock drive to take time exposures of the night sky with no star trails. I attached a photo of my rig setup on the local mountain a...

Thanks so much for clearing up the confusion. Everything you say makes sense now. It sounds like the old Fujichrome Provia 1600 I used to shoot. It was actually 400 speed film pushed to 1600 with their recommended processing time. Exactly like this Rollei stuff. Wonder what film they used to use...

I'm looking for someone with any experience with this film and it's development time. I'm shooting 4x5 format in an astrograph camera of the night sky. I have a clock drive to negate star drift and have shot several exposures of Orion using a #29 deep red filter. I know this lets a bit of the...

Nice photos James, I like your 4x5 piggyback system. by the way, someone asked for my exposure time and I forgot to post that. It was: 24 minutes at the wide open setting of f/2.5. I used the Provia 100F chrome film and pushed it 3 stops in processing. That is the maximum the film is capable of...

All information on this lens states that the astigmatism is fairly well corrected. I think it is chromatic aberration (with a bit of field curvature) as the different colors of light are focused progressively further away in a larger circle of confusion. Stopping the lens down would kind of...

I agree on the Provia. I used to shoot Provia 1600 chromes and that was spectacular. Too bad it is gone. As for the B&W, I don't know about the Aviphot 200 you mentioned. The box states this is an ASA 400 film, sensitive to the full visual spectrum as well as the IR up to about 800nm. It is...