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Old 6th April 2020, 10:14 AM
AnimalBones AnimalBones is offline
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Default Durst lens board and condenser question

Dear all

I am printing using a Durst 707 AC inherited from my Father in law. He used it for 6x7 so has swapped out a couple of bits. I am experiencing two issues

1. I have purchased a Rodagon 50/2.8 but the bellows will not go high enough to enable me to focus. I have resolved this by just ordering a Durst Siriotub to bring the lens closer to the negative (awaiting delivery).

2. I have 50 mm lens ATM that will focus but I am experiencing significant light drop off in the corners when I do down 2 stops. The condenser has been replaced with a Vegacon 100 for the larger lens Componon 105/4.5 my FIL was using. Will fitting the Siriotub and bringing Lens and negative close together fix my light drop off problem? Do I need to purchase the Siriocon 50 condenser for a 50 mm lens. It strikes me that this should not be necessary as this is just a smaller condenser lens. In which case, why am I getting light drop off? I have adjusted position of bulb, that is not the issue.

Somewhat lengthy, hope someone can help

Martin
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Old 6th April 2020, 10:27 AM
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MartyNL MartyNL is offline
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Yes, Martin. You will need the corresponding condenser and lens board for each lens in order to avoid issues.
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Old 6th April 2020, 12:08 PM
AnimalBones AnimalBones is offline
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Thanks. I’ve ordered the Siriocon 50.
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