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Pinhole MG Filter Adapter

A few months ago a friend gave me an old set of Ilford multigrade filters he used in college. He thought I would get some use out of them in my home darkroom. It's nice to have this set. They are good for a couple of really cool contrast techniques in darkroom printing on multigrade paper. It can really save your bacon with a difficult print.

I wanted to also use these filters with my pinhole camera and multigrade paper. The contrast with the paper negatives can be a little extreme and these filters can tame contrast. However, my filters can't easily be taped to the front of the camera. I had to devise a method to hold them.

The 3 inch filters are designed to go under the lens on a darkroom enlarger. Each filter is mounted in a plastic holder that slides into a corresponding mount attached to the enlarger. I pulled out my calipers, did a little measuaring, and crafted a design in Tinkercad. A hours later and I had this design:


I decided to print it in two pieces on my Monoprice Mini Select and use a fair amount of cyanoacrylate. The grippy bits were printed with the flat side down and the larger filter holder was printed standing up. Because of the tight tolerances required in the filter holder, I didn't want to deal with internal supports. There would be too much friction when I try to install the filter.


This camera has a 90° angle of view and several iterations didn't take this into account. In the end I guessed about the diameter of the cut-outs. The corner of a sheet of paper was a perfect tool to see if there was any obstruction in that 90° angle of view. It looked good.


All of the filters slide nicely into the holder and the fingers grip the bezel around the pinhole. It's sturdy and easy to use.


The next step is to try out the filters with a paper negative. Maybe I'll be able to tame some contrast.

Comments

  1. Nice! Hey, you might like to check out a new project that just popped up - you gots a printer, they gots the design files: http://www.3dtypewriterparts.com/
    :D

    ReplyDelete
  2. هل تبحث عن شركة متخصصة فى خدمات التنظيف بالطائف بافضل المعدات والسوائل وثقة تمة فى العمل ودقة فى النتائج كل هذه المميزت توفرها شركة الخليج الشركة الافضل والامثل فى الخدمات المنزلية بالطائف وبما اننا الشركة الافضل والامثل بدون منافس سوف نسعى لتوفر افضل الخدمات باقل تكلفة وبقدر كبير من الاهتمام والدقة عزيزى اينما كنت فى اى منطقة ا وحى تابع لمدينة الطائف اتصل بنا وسوف نصلك فى الحال شركة الخليج للخدمات المنزلية شركة تنظيف منازل بالطائف
    شركة تنظيف فلل بالطائف
    شركة تنظيف خزانات بالطائف
    شركة تسليك مجارى بالطائف
    شركة رش مبيدات بالطائف
    شركة مكافحة نمل ابيض بالطائف
    شركة مكافحة حشرات بالطائف
    شركة عزل اسطح بالطائف
    شركة عزل خزانات بالطائف

    ReplyDelete
  3. نقدم لكم بعض الخدمات فى الاعمال المنزلية الممثله فى التنظيف الشامل للمنزل ومكافحة الحشرات وعزل الاسطح وكشف تسربات المياة ونقل الاثاث بكل انوعه كل ذلك يساعد فى الحصول علي مظهر رائع بواسطة افضل الفنيين والمتخصصين فى هذا المجال باستخدام احدث المعدات.
    شركة عزل اسطح بابها
    شركة كشف تسربات بابها
    شركة تنظيف خزانات بابها
    شركة مكافحة حشرات بابها
    شركة عزل اسطح بخميس مشيط
    شركة كشف تسربات بخميس مشيط
    شركة مكافحة حشرات بخميس مشيط
    شركة تنظيف منازل بالطائف
    شركة نقل عفش بالطائف

    ReplyDelete

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