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Pulling Arista EDU100

 
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ktm_2000



Joined: 19 Jun 2019
Posts: 75

PostPosted: Tue Apr 27, 2021 5:29 pm    Post subject: Pulling Arista EDU100 Reply with quote

Hi All,

I've been enjoying my speed graflex and aero ektar combination but have been running into issues with too much light for f2.5 even with the 1/1000th shutter speed as my meter is telling me 1/4000+ on a sunny day.

I've tried pulling a roll of tmax400 but haven't tried with Arista EDU.

How many stops do you think I could get away with? if I tried pulling?
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45PSS



Joined: 28 Sep 2001
Posts: 4019
Location: Mid Peninsula, Ca.

PostPosted: Tue Apr 27, 2021 7:18 pm    Post subject: Reply with quote

https://www.digitaltruth.com/devchart.php?Film=Arista+EDU%25&Developer=&mdc=Search&TempUnits=F&TimeUnits=D
It will depend on the developer you're using.

Are you sure your shutter is running at its marked speed?
A neutral density filter may be needed.
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ktm_2000



Joined: 19 Jun 2019
Posts: 75

PostPosted: Tue Apr 27, 2021 9:12 pm    Post subject: Reply with quote

I have no good way of telling that the shutter speed is off, it has purely been the case where I've chosen to not take shots due to conditions.

this shot here was 1/500th and came out fine (excluding my development issue I figured out on another thread)
https://photos.app.goo.gl/GR4DhTGxicdpt6bx8

I have a NISI 100x100mm holder along with a couple ND filters but haven't tried to get a ring on the front of the aero ektar. I'll see if I have a ring which would work.

I was thinking in a perfect world pulling 2 stops I could cheat near 1/4000s.


We are heading to Acadia National park for a long weekend, I'll shoot a developing batch of 3 holders 2 stops over as a test.
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45PSS



Joined: 28 Sep 2001
Posts: 4019
Location: Mid Peninsula, Ca.

PostPosted: Tue Apr 27, 2021 10:06 pm    Post subject: Reply with quote

https://silvergrainclassics.com/en/2020/06/introducing-the-photoplug-easy-shutter-speed-testing-for-your-smartphone/

After testing several FPS on 4x5 Speed Graphics I found that a sensor at the center of the film plane will read the speed accurately. I had a homemade tester using infrared led that required a powered mic jack on the computer to work.
I recently built one using a battery holder and 4K ohm resistor from ebay and a SHF 310 photo transistor from Mouser.com.
I can email you the diagram I used as its no longer on the net.
The tester uses https://www.audacityteam.org/ recording program. The accuracy is based on the photo transistor/diode 's rise/fall time which is 8 microseconds.
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keshlam



Joined: 21 May 2021
Posts: 38
Location: Boston area

PostPosted: Wed Jul 28, 2021 3:34 am    Post subject: Reply with quote

... using Audacity as a poor man's memory oscilloscope. Nice solution!
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