July 29, 2014, 01:30:58 PM

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Messages - tolusina

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16
1D X Sample Images / Re: Any Thing shot with a 1Dx
« on: July 20, 2014, 07:35:50 PM »

Joe Buissink .......... only ever uses P mode.
Wanna buy a bridge?

......he uses P mode 100% of the time.
P mode and Program Shift are two different things.
Your statement that he uses P mode 100% of the time is not supported by the work displayed on his web site.
…..Ever watch him shoot? I have....
Really? A $10k+ Wedding Photographer just let you puppy along so you could watch his every finger twitch as he worked? He mirrored his LCD to your smart phone so you could see every setting?
That scenario sounds as credible as a camera forum poster who presents as an authority yet never posts his own examples.

There are many bridges. Any preferences?


17
1D X Sample Images / Re: Any Thing shot with a 1Dx
« on: July 20, 2014, 11:25:11 AM »

Joe Buissink .......... only ever uses P mode.
Wanna buy a bridge?

18
Software & Accessories / Re: laptop for tethered shooting?
« on: July 19, 2014, 01:26:41 PM »
DSLR Controller on most recent Android phones and tablets.
You'll need to add an inexpensive USB OTG Host cable between your Canon's USB cable and the Android device, the app automatically launches as soon as a powered on and compatible Canon is connected.
DSLR Controller is loaded with capabilities, features.
There are several users here, I've not seen any complaints posted yet.

19
Lenses / Re: Camera setup for dental clinic
« on: July 17, 2014, 12:11:48 PM »
...They probably have crop bodies because no one told them the difference between crop and FF....

.....I wouldn't look at cost too much as you can write off all this gear.

Yes, this ^^.
---
I'll start by stating that I know absolutely nothing about medical imaging.
I do know that I'd really prefer my medical professional not make surgical decisions based on photographs with fun house mirror type distortions.
To avoid visual compression or fish eye effects one must use a near normal or natural focal length, that natural or normal focal length being one that's as close as possible the sensor's (or film's) diagonal.
 
I looked up specs for a 7D that uses a typically sized Canon 1.6 crop factor sensor with dimensions of 22.3 x 14.9 mm, diagonal of that sensor is approximately 27mm.
I'm unaware of any macro lenses with a focal length near 27mm.
 
Diagonal of a full frame 36 x 24mm sensor is approximately 43mm.

On a B&H listing of Canon mount macro lenses

there is a Canon EF 50mm f/2.5 Compact Macro Lens

a Sigma Normal 50mm f/2.8 EX DG Macro Autofocus Lens

and a Canon MP-E 65mm f/2.8 1-5x Macro Photo Lens

All with focal lengths fairly close to the 43mm full frame diagonal, for sure a lot closer to the 43mm full frame diagonal than the 27mm crop diagonal.
 - - -
Note that the Canon EF-S 60mm f/2.8 Macro USM Lens and the Tamron G005 SP AF60mm f/2.0 Di II LD 1:1 Macro Lens are both for APS-C crop sensor bodies and cannot be used on full frame bodies.
- - -
Regarding concerns about how close to a patient you'll need to be with these shorter focal lengths, um, you will soon be close enough as to be in the patient's mouth when actually working, is closeness of a camera really relevant?
 
Regarding LED ring lights, I've made and used several. As they were not real bright, a steady camera and subject are both helpful. They did indeed cast even and mostly shadowless light.
Being continuous light, you get a very good idea what your photo will look like through the finder or live view before triggering the shutter unlike with flash where you find out after.
This might be a consideration towards minimizing patient discomfort by avoiding multiple flash discharges as you dial in the exposure.
Then too, likely, once you've a small bit of experience you'll know what settings work and will need but a single flash exposure.


20
Canon General / Re: Colombia
« on: July 14, 2014, 04:30:30 AM »
If visiting a Third World Country causes concern, consider not taking and flaunting your First World extravagances.
Take only one, un-gripped body, mount a 40mm pancake and call it good.
Hang the camera from a Kevlar UPstrap or a stainless cable reinforced Carrysafe, no big gear bag, only a small belt looped accessory bag.
I consider essential accessories to include a battery charger, spare battery, spare memory cards, a CPL, an infrared remote.
If you want some minimal support, a weighted string with a clasp, a 1/4" - 20 eye bolt screwed into the tripod socket for the string's clasp.
I'd leave laptop and tablet home, use a smartphone for tethering, appropriate cables.
 
You may just find traveling and shooting gear light and minimal to be liberating and exhilarating, you may just find fresh creativity without the aids of multiple focal lengths.
 



21
Animal Kingdom / Re: Animals at Night
« on: July 12, 2014, 08:14:52 PM »
... I think I would prefer this blue look.......
I most likely would prefer this blue look too. As I posted above, it is quite dramatic and places the subject well (under black light).
 
What I am suggesting, since black light is so radically different from 'normal' light, setting white balance to black light will produce very different results, those results dramatically demonstrate the effects of setting a custom white balance.
Again, results from a black light white balance setting may not be as pleasing as AWB, the exercise is highly worthwhile just as an exercise, you'll at least start becoming adept at moving away from AWB in other circumstances if and when needed.
 
To set, shoot a gray card or something white under whatever light you wish the camera to think of as white.
Don't know what model you shoot, on 6D, 3rd menu from left, scroll down to 'Custom White Balance'. > Set > only compatible images displayed. Scroll left or right to your reference photo, hit the set button. That puts you back to the 3rd from left menu, scroll up one to 'White Balance" > set > scroll to the custom icon.
Once a custom WB has been set, go back into the menus or use the Q button to activate it or any other of the WB options.

You're essentially lying to the camera about what is white and giving the camera no choice but to comply.
 
Do give it a try, the capability to set and use customizations like this are among the reasons to buy and use DSLRs rather than accept smart phone limitations.
WB and Custom WB are DSLR power tools and good to know how (and when) to use.
 
 
 
 
.

22
Canon General / Re: Dragonfly, Powered by Canon Lenses
« on: July 12, 2014, 06:33:30 PM »
A couple questions come to mind;
Are Canon engineers going like "whoa, I had no idea our stuff could do that!!"

Are any astronomers building similar arrays using Zeiss, Nikon, Sony, Pentax or any other off the shelf glass?

I chatted with one of the guys on this project ....
What do such arrays use for image recording?

23
Lenses / Re: Polarizer filter on the 70-200 2.8
« on: July 12, 2014, 10:31:22 AM »
Any time and every time I take my camera I bring a circular polarizer.

24
Animal Kingdom / Re: Animals at Night
« on: July 12, 2014, 10:25:04 AM »
.......with black lights to find them (since scorpions fluoresce under black light).



Canon 5D3, Sigma 85 1.4 lens, 1/80 second at f3.2, iso 3200, tripod.

What, if anything, did you do with/about white balance under black light?
I've shot under black light only a few times, auto WB produces a result similar or same as yours here, setting a custom white balance with the black light aimed at a gray card, sheet of paper, white tee shirt or what have you produces a very different result.

Mind, I'm not criticizing how you've shot here, it's actually quite dramatic and certainly places the subject well. Just saying you will find setting custom WB interesting for sure, though the look may be on the clinical side, therefore less eye pleasing. I do think it's worth a look.
 
Last time I set a black light WB, I intentionally left that WB set and then shot under florescents, boy and howdy that came out wrong but sure was interesting and educational. You'll likely only do that once, but that once is worth doing.

25
......(wafers are round, so the larger the sensor, the larger the wasted fragments on the edges) ........
Hmm, then why not round sensors, round like lens elements are round. Waste can then be transferred to the end user should they choose to print round.
 
Or, why not square sensors, 36mm on a side, would that still fit in the same image circle as 24 x 36? Crop later if you want landscape or portrait.

26
.......

My question to the experts here......
Conversely, if the camera/lens is held stationary, and the focus is selected by adjusting the lens focusing mechanism, what will be the result?.....


I know you asked for experts, I'll try an answer to this part at least.
Two images from my posts above, first is the end result, second is a gif showing the progression of the frames.
The gif sure shows a zoom effect as focus changes, not being expert, I've no explanation, only the observation.








Canon 6D,
Canon EF 40mm f/2.8 STM lens
20mm Kenko extension tube.
Lens max magnification specification, 0.18x.
Calculated magnification, 0.68x.
Tethered to an ASUS MeMO Pad FHD 10 (Android 4.3). Focus limits, steps and control by DSLR Controller.
Gitzo, RRS, Acratech support.
 
Composites were stacked from the RAW .CR2 files, automated with Helicon Focus, saved as tiff, converted to jpg, cropped. Gif stacked in Gimp.
 
12 frames at f11, 2 second shutter speed.

27
Photography Technique / Re: Help me on using tripod
« on: July 10, 2014, 05:06:32 PM »
Lens over leg, especially when leg spread is reduced.
This is kind of a corollary to Jamesey's post regarding one leg down slope, as best you can, keep the lens over that down slope leg.

28
Photography Technique / Re: Tour de France crops
« on: July 08, 2014, 05:52:02 PM »
Yesterday afternoon a stage of the Tour de France started from Cambridge

Someone please explain why the "Tour de France" started in England?
That was done expressly to bewilder some forum posters. I wonder if it worked?

29
Landscape / Re: Beautiful sunsets
« on: July 07, 2014, 01:26:26 PM »
From inside the Phoenix airport while in the boarding line. Also posted in the something colorful thread.
 


30
Street & City / Re: Let's post something colorful
« on: July 03, 2014, 01:33:30 PM »

Three from the Phoenix Airport.
I've not been to many airports, I find most barely endurable, Phoenix was rather fun to wander through, even found a top notch Barista there. Then the sky caught fire.
PNX sky flames........

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