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In-camera focus bracketing with Olympus OMD M1 part 2
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austrokiwi1



Joined: 14 Sep 2014
Posts: 338

PostPosted: Sun May 08, 2016 3:07 am    Post subject: Reply with quote

ChrisR wrote:
How depressing!
We can all think of ways to try to work it out, but giving no guide at all doesn't earn them any respect.

Does the "0.75 x dof" theory seem to work? Does it change with aperture?


I haven't really looked at it further. I think the .75 of DOF is as good a guess as any. From my observations ( not rigorous) it does seem to match up with the focus peaking highlights, the 2-3 times I tried to see what was going on.
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Macro lenses: Printing nikkor 105mm, Sony FE 90mm F2.8 Macro G, Schneider Kreuznach Makro Iris 50mm , 2.8, Schnieder Kreuznach APO Componon HM 40mm F2.8 , Mamiya 645 120mm F4 Macro ( used with mirex tilt shift adapter), Olympus 135mm 4.5 bellows lens, Oly 80mm bellows lens, Olympus 60mm F2.8
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Vish_007



Joined: 11 Feb 2011
Posts: 63
Location: Birmingham, Alabama - USA

PostPosted: Sun May 08, 2016 11:21 am    Post subject: Reply with quote

[quote="wayupnorth"]
Quote:


In order to maintain constant exposure between shots P, A & S are unsuitable so the camera should be used in manual.



Thank you,
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Vishnu
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elf



Joined: 18 Nov 2007
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PostPosted: Sun May 08, 2016 11:09 pm    Post subject: Reply with quote

I'll have to disagree a little bit. I use aperture priority mode in order to maintain consistent exposures, especially when doing macro panoramas.

I think it's best to experiment when shooting in different environments.
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Pau
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Joined: 20 Jan 2010
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PostPosted: Sun May 08, 2016 11:46 pm    Post subject: Reply with quote

Each one has his style and tricks, but as general advice I agree that M mode will provide the most uniform exposure between frames, of course providing that the illumination is constant.
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Pau
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Lou Jost



Joined: 04 Sep 2015
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Location: Ecuador

PostPosted: Sat Jul 16, 2016 8:11 pm    Post subject: Reply with quote

I now have tested some of these lenses as tube lenses for the Mitu 10x. I can confirm that the Oly 60mm macro vignettes with this objective, but their beautiful 75mm lens does not. The field of view with the 75+Mitu is 4.6mm. This looks very good.

I've also tried the Panasonic 100-300 as a tube lens. Vignettes at all zoom settings, though at 300mm only the corners are affected. The results do not look sharp though (in the viewfinder).
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pierre



Joined: 04 Jan 2010
Posts: 241
Location: France, Var, Toulon

PostPosted: Fri Sep 23, 2016 11:36 pm    Post subject: In-camera focus bracketing with Olympus OMD M1 part 2 Reply with quote

Dears,

A bit off line question, but since you have to take numerous pictures, you might want to lose a stack due ran-off battery.

Does the E-MD5 Mark II have a way to have permanent AC power like the Nikon or Canon using dummy batteries ?

I have search for this but failed.
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Pierre
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g4lab



Joined: 23 May 2008
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PostPosted: Sun Sep 25, 2016 11:35 pm    Post subject: Reply with quote

The M5 mk II can be run on AC but it is an expensive addition. You have to buy a double grip outfit and second battery and the AC adapter is like $80.

But it us available. buy the time you buy all the parts you will be several hundred dollars lighter. But the camera is very reasonably priced to start with given its many talents.
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elf



Joined: 18 Nov 2007
Posts: 1351

PostPosted: Sun Sep 25, 2016 11:54 pm    Post subject: Reply with quote

There are several models of the BLN-1 battery on thingiverse. It wouldn't be too much of a stretch to 3d print one and connect it to a 7.4V wall wart.
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Lou Jost



Joined: 04 Sep 2015
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Location: Ecuador

PostPosted: Mon Sep 26, 2016 5:54 am    Post subject: Reply with quote

I bought the power supply for the em5II. But there is no similar thing for the PEN F which has a better sensor. Do you think it would be safe to make a dummy battery and connect to a DC transformer? Voltage regulation might not be sufficiently precise.....
\
Alternativeluy use a dummy battery in the camera connected to a battery pack outside made of a few Oly batteries in parallel.
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wayupnorth



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PostPosted: Mon Sep 26, 2016 8:58 am    Post subject: Reply with quote

Surely the simplest way is to invest in a couple of spares and change batteries a bit earlier. I have 3 and would probably run out of storage first.
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pierre



Joined: 04 Jan 2010
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Location: France, Var, Toulon

PostPosted: Mon Sep 26, 2016 12:32 pm    Post subject: In-camera focus bracketing with Olympus OMD M1 part 2 Reply with quote

Many this for your answers & kind support.

3D print seems OK.

There is also a ready to use solution:
https://www.bhphotovideo.com/c/product/1259651-REG/tether_tools_crbln_1_relay_camera_coupler_for.html

Using DC couplers works fine on all Canon, and the Fuji camera I have used.
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Pierre
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Lou Jost



Joined: 04 Sep 2015
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PostPosted: Mon Sep 26, 2016 2:32 pm    Post subject: Reply with quote

Pierre, magnificent solution!!!! Thank you so much. This is perfect for the PEN F and solves the biggest problem of shooting deep stacks with that camera. I ordered it immediately.
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elf



Joined: 18 Nov 2007
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PostPosted: Mon Sep 26, 2016 5:02 pm    Post subject: Reply with quote

Did you order the required relay as well? https://www.bhphotovideo.com/c/product/1235872-REG/tether_tools_crups110_case_relay_camera_power.html/pageID/accessory
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Lou Jost



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PostPosted: Mon Sep 26, 2016 5:08 pm    Post subject: Reply with quote

Yes I did, but thanks for making sure. I could easily have missed that.
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ChrisR
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Joined: 14 Mar 2009
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PostPosted: Mon Sep 26, 2016 5:26 pm    Post subject: Reply with quote

A big external battery could have been another way to go. Eg here,
http://www.exprodirect.com/ex-pro-on-the-move-7600mah-rechargeable-battery-power-system-replacing-for-use-with-ex-pro-coupler-system-for-canon-nikon-and-sony-dslr-cameras..html
Though they don't do an Oly lead I expect the voltage is the same??

Be careful with external supplies.
I used a cheap one for a Canon 600D/T3i for years, then one day I plugged it in while it was switched on.
It broke the camera - beyond economical repair. I get "Error70" unless I only use the useless auto mode.

I'd like to know exactly why it broke it. It isn't difficult to limit the open circuit voltage of a power supply. I doesn't measure very high on a meter but it could be spiky.
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