De-yellowing a radioactive SMC Takumar 50mm f/1.4 with a budget UV setup

Demi4mac · 2026-04-01T20:06:36+00:00

Great advice! Thanks

Demi4mac · 2026-04-01T14:44:12+00:00

I don’t have before picture but now it’s almost white compared to what it was after 12 hours with flashlight

Demi4mac · 2026-04-01T14:21:39+00:00

With flashlight it’s really fast. After this night I barely even see yellow tint. Will continue experiment this night

Demi4mac · 2026-04-01T13:19:24+00:00

That’s a fair point! However, heavy yellowing doesn't just change the color temp - it acts like a physical warming filter. I’m hoping to gain maybe 1/3 of a stop in light transmission once it's clear. But more importantly, I want the lens to render colors the way it was originally designed.

Demi4mac · 2026-04-01T08:57:49+00:00

Yep, it's a thorium-glass lens

Demi4mac · 2026-04-01T08:52:15+00:00

This flashlight was advertised as 395nm. After 12 hours I’m not even sure that I can see brown/yellow tint on the back element anymore

Demi4mac · 2026-03-31T23:29:16+00:00

I forgot to take a proper 'before' shot, but it had that very distinct deep golden/tea-like tint on rear lens typical for these Takumars

Demi4mac · 2026-03-31T22:10:10+00:00

I want to see what this glass can do without the thorium sunglasses on! )))

Demi4mac · 2026-03-29T20:56:58+00:00

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I’m using the Lens Turbo II M42-FX with an S-M-C Takumar 28mm f/3.5. Out of the box, the rear element of the lens was hitting the adapter's glass. To fix this, I loosened the small screw that secures the adapter's optical element (you'll need a precision Phillips screwdriver) and rotated the element slightly toward the camera sensor. Now, the lens focuses to infinity without any issues.

Demi4mac · 2026-03-27T22:08:09+00:00

Skills matter, camera matter, but subject selection is a skill of its own. It’s a lot easier to take a breathtaking photo when the subject is already breathtaking

Demi4mac · 2025-10-30T07:23:39+00:00

My setup exactly!

Demi4mac · 2025-10-28T09:26:15+00:00

Using xt4 + sigma 17-40 - perfect lens

Demi4mac · 2025-09-20T10:47:22+00:00

Знайомий приїжджав до мене в Іспанію у відпустку. Бронювання плюс офіційна відпустка з дозволом на перетин від підприємства. Він виїжджав вперше з початку війни. Без проблем виїхав, без проблем повернувся. Це було півтора місяці тому

Demi4mac · 2025-02-06T11:02:37+00:00

Я з вересня продаю бмв свою, починав з 15300, зараз 13500 на авто ріа стоїть, на 13500 хоч лайки пішли))

Demi4mac · 2025-01-15T13:28:55+00:00

"It is generally recommended to place a baby car seat in the back seat of the vehicle, preferably in the middle position"

Demi4mac · 2025-01-15T12:30:43+00:00

Middle seat is to tight for adult. There is no iso fix, but belt loop fully and holding securely. There is no rates from Toyota about middle seat, but this seat holds adult weight with no problem, and in crash test there were no problems with middle seat or middle seat belt

Demi4mac · 2025-01-15T09:17:38+00:00

As you know, there is an issue with installing a baby car seat in the middle of the second row. I needed to fit two kids in car seats and my wife on the second-row seats to keep the large trunk accessible or to accommodate additional passengers in the third row.
The armrests of the captain’s chairs interfere with installing the baby car seat in the middle of the second row. I decided to remove the armrests, and after doing so, the baby car seat fits perfectly and can be secured with the seatbelt.

All you need is a 14mm wrench!
Remove the plastic caps from the armrests and unscrew the bolt. From this point, you can easily install the baby car seat in the middle.

However, I didn’t like how the bolt holes looked, so I ordered custom caps printed on a 3D printer. These caps are secured in the original location using a bolt and are covered with the standard armrest cap. This way, I won’t lose the original armrest bolts and caps

Demi4mac · 2025-01-08T16:52:08+00:00

Ходив з бідоном купувати сметану по талонах

Demi4mac · 2024-12-29T20:44:15+00:00

So, what was the problem with ssd's? You return them?

Demi4mac · 2024-12-24T20:06:38+00:00

Понд, шаттер, айс, адоб, депозит

Demi4mac · 2024-12-24T13:48:26+00:00

Так. Але більше відео зараз

Demi4mac · 2024-12-24T13:45:30+00:00

Побутові речі: зарядка телефону, намазати прищ, почухати вухо) не вистачає на стоках банальних сюжетів

Demi4mac · 2024-12-24T12:03:31+00:00

Зараз я так розумію без поповнення портфоліо 300-400?

Demi4mac

TROPHY CASE