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Forum: Post Your Photos! 21 Hours Ago  
Architecture Factory doors
Posted By bobbotron
Replies: 6
Views: 121
I really liked the red! These were tricky to photograph, the light painting helped get more light where you wanted it. This was with an older K mount 28mm lenses, those lenses sure are sharp.
Forum: Post Your Photos! 22 Hours Ago  
Architecture Factory doors
Posted By bobbotron
Replies: 6
Views: 121
These doors are really interesting, they're closed by gravity, opened via a long cord or cable. Practiced some light painting with both...




Forum: Contest Voting 1 Day Ago  
Self portait
Posted By bobbotron
Replies: 8
Views: 91
Love it!
Forum: Post Your Photos! 1 Day Ago  
Cityscape Old woolen mill
Posted By bobbotron
Replies: 3
Views: 124
Yeah, this one is on the chopping block, up for sale for $6 million. I could see it being demolished, there's a lot wrong with the roof, the inside of it is soggy as a result.
Forum: Post Your Photos! 1 Day Ago  
Cityscape Old woolen mill
Posted By bobbotron
Replies: 3
Views: 124
Forum: Post Your Photos! 1 Day Ago  
Machinery Old mill breaker panel
Posted By bobbotron
Replies: 4
Views: 159
Yeah, there one of these on each floor. The main floor was a huge mess, there was probably a larger panel, etc there.

I think the whole building is disconnected, but definitely gave me pause looking at this photo after the fact.
Forum: Post Your Photos! 1 Day Ago  
Machinery Old mill breaker panel
Posted By bobbotron
Replies: 4
Views: 159
I had the opportunity to tour around in a decommissioned wool mill today. Enjoying these two photos of a (hopefully very disconnected) breaker panel.




Forum: Flashes, Lighting, and Studio 1 Day Ago  
Looking for some help setting up a Cactus laser trigger setup
Posted By bobbotron
Replies: 19
Views: 430
Thanks for weighing in! I will try to downgrade at some point, the LV5 definitely does NOT trigger any of my V6 equipment at the moment. I have tried hard to get it to work, though have not tried a protocol downgrade. Which is fine, I've been triggering the flash right off the laser sensor via a cable.


I think you're correct about the signal from the LV5 being too "short". It is in single mode, even the cactus RF60 flash will 100% of the time consider it a event, whereas if I'm driving a V6 trigger from it, in TX mode, it rarely considers it an event. This is all fine, I have enough of the components to drive it in such a way that works well.

I'm off trying to get the setup to trigger the camera, using a black background works well. Definitely need more practice experimenting with things.

I'm curious if you know how much of a "delay" the wireless signal introduces? I was wondering about this, how much time it takes for one "message" from transceiver to receiver. If it's super fast, I could see using an RF60 as a master, to then fire off a flash into the air and trigger my 2nd flash.
Forum: Post Your Photos! 3 Days Ago  
Night Flash practice
Posted By bobbotron
Replies: 4
Views: 151
I used the Cactus LV5 trigger (I think that's it's name?), hard wired to a Cactus RF60 flash.
Forum: Post Your Photos! 3 Days Ago  
Night Flash practice
Posted By bobbotron
Replies: 4
Views: 151
Yeah! The balloon was filled with water, popped with a pellet gun. A friend and I both got photos of it, really fun Friday night. I need to utilize the laser "freeze" function for the next test session, you can see here the flash actually actuated a few times because the beam was being tripped a few times while the water was in the air. The freeze feature makes it so it won't send a second "tripped" signal for another X milliseconds.
Forum: Post Your Photos! 3 Days Ago  
Night Flash practice
Posted By bobbotron
Replies: 4
Views: 151
Trying out my cactus laser triggers, lots to learn.



More photos in this album

2019-11-09 Laser trigger test | Flickr
Forum: Flashes, Lighting, and Studio 3 Days Ago  
Looking for some help setting up a Cactus laser trigger setup
Posted By bobbotron
Replies: 19
Views: 430
I read your post again, informative stuff! My friend is an electrical engineer but I donít think Iíll be able to convince them to wire up a test circuit.

Iím going to do some more practical tests with the multi strobe feature, see how it goes.

Hilariously we tried to shoot a pumpkin with a crossbow bolt tonight. The bolt went clear through the pumpkin, no explosion, no flash!
Forum: Flashes, Lighting, and Studio 3 Days Ago  
Looking for some help setting up a Cactus laser trigger setup
Posted By bobbotron
Replies: 19
Views: 430
The RF60 has a multi flash mode... You literally tell it X flashes at Y hertz. I haven't measured if it's actually consistent between strobes, this is too picky for me at this point!

I played around with this a bit tonight. It's too cold outside for great accuracy, but fun was definitely had.



Forum: Pentax Film SLR Discussion 4 Days Ago  
Post your B&W Film shots
Posted By bobbotron
Replies: 8,724
Views: 930,795
Aren't these wide angle 35mm cameras fun? I have a lomography sprocket rocket. I find it's a little to low-fi for my tastes, but working with it is really fun.
Forum: Pentax Forums Giveaways 4 Days Ago  
Sticky: PentaxForums 100 Year Giveaway - November- General Raffle Entry Thread
Posted By bobbotron
Replies: 237
Views: 3,003
I'm in! Man I'd like the Theta! <3
Forum: Flashes, Lighting, and Studio 4 Days Ago  
Looking for some help setting up a Cactus laser trigger setup
Posted By bobbotron
Replies: 19
Views: 430
Yeah, the RF60 triggers have a wireless trigger built in, so in theory they can pick up the signal. I'll have to play around with it more. The V5's are great at what they do, but the dial on them has unusably small numbers on them. I'll have to read the book again to figure out what RF channel `1` maps to. Triggering via a cable is simple and incredibly reliable, and fine for the trigger setup I'm planning, so might go that route.

It's interesting, I'm planning on using a crossbow that fires (in theory) at 400 feet per second. Using multi flash, with a relatively high hertz of 100, this means (if my math is right) that the bolt will travel 4 feet per flash pulse. This means that at most I'll get about 3 images captured. I have some pumpkins I plan to test this all out with as well as water balloons.


The fun thing, is that I have enough of all of the components to play around with different set ups.
Forum: Flashes, Lighting, and Studio 4 Days Ago  
Looking for some help setting up a Cactus laser trigger setup
Posted By bobbotron
Replies: 19
Views: 430
So I read that the V5 emitter *should* send out a wireless signal that the V6 gear will pick up, but in practice I'm not sure how to make that actually work. Setting the flash to slave mode, it doesn't get the signal when I hit test on the emitter.

@BrianR, interesting stuff. My engineer friend and I are going to have a go of it tonight, try a few different things. :) This is my first set of laser triggers, that's cool you have a few!
Forum: Flashes, Lighting, and Studio 4 Days Ago  
Looking for some help setting up a Cactus laser trigger setup
Posted By bobbotron
Replies: 19
Views: 430
I'm all about using the tools in the way that makes the most sense. A friend's coming over tonight and we're going to have a go of some action photography, will post up the results.

@AstroDave, thanks for all of the insights. I mostly have Cactus flashes so I'll be running them at 1/64 or 1/128th power. I don't know if they publish their lag times, will see how it goes. I guess reducing the number of "messages" would make sense, if there's some delay between triggers etc. I have a long flash cable, was thinking trigger to flash via a cable.
Forum: Flashes, Lighting, and Studio 4 Days Ago  
Looking for some help setting up a Cactus laser trigger setup
Posted By bobbotron
Replies: 19
Views: 430
:) Fair enough! Thatís a great point.
Forum: Flashes, Lighting, and Studio 4 Days Ago  
Looking for some help setting up a Cactus laser trigger setup
Posted By bobbotron
Replies: 19
Views: 430
That's my fallback order of operation, but I was hoping to do it this way so it's a fully enclosed event loop. You can put a slight delay on the cactus flash too, to ensure the shutter is open when the flash activates.

In theory you can use this to "capture" wildlife too. It does work when the k3 actually gets trigger, just kind of intermittent. :)


Ha, I'm going to do this outside! :D
Forum: Flashes, Lighting, and Studio 4 Days Ago  
Looking for some help setting up a Cactus laser trigger setup
Posted By bobbotron
Replies: 19
Views: 430
I have a cactus laser trigger and I'm trying to work out the kinks in it. I'm getting there, could use some tips and advice. The end goal is to do strobe (multi flash) photos of an arrow passing through a water balloon.

Current setup
Laser triggers, cactus v6 trigger set up with the emitter. This v6 trigger is set to TX, linked via a 3.5mm cable.

Cactus flash, set to manual mode multi flash mode, attached to a V6 trigger in receiver mode (I've found this is a lot more reliable for whatever reason)

Cactus trigger on my K3, set to rx mode, linked via trigger cable.


The issue

So this all works, *except* the V6 trigger only seems to trigger the K3 about once every 4th shot. It's very weird. I turned off live replay on the K3, but it still seems to not get the signal all the time. My theory is that the flash "signal" is too short. If I manually trigger it from the V6 trigger it works every time.


All the bits

Forum: Pentax Film SLR Discussion 5 Days Ago  
Post your B&W Film shots
Posted By bobbotron
Replies: 8,724
Views: 930,795
I like this idea! :) This was a fun photo to take. It was with Foma 200, I think with an ND filter, and I think it was a 90 minute exposure.
Forum: Pentax Film SLR Discussion 5 Days Ago  
Post your B&W Film shots
Posted By bobbotron
Replies: 8,724
Views: 930,795
Sunflower dreams, another RealitySoSubtle pinhole photo

Forum: Pentax News and Rumors 11-04-2019, 07:01 PM  
Ricoh's US Website adds "fan shop"
Posted By bobbotron
Replies: 72
Views: 2,433
I was thinking that too!
Forum: Contest Voting 11-02-2019, 05:22 PM  
Running low on oil
Posted By bobbotron
Replies: 13
Views: 115
Ha! It's a very curious old piece of machinery, really just the cockpit, hard to tell what it even was. :)
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