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Lens focus The place to talk about your camera's glassware.

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  #16  
Old 22nd August 2013
pvasc pvasc is offline
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Re: Comparison test

I have been playing with the DTC too. My tests were DTC vs RAW crop. But the question I have is, does anybody know if Oly improved the DTC output in the last firmware? I was not really pleased with the out put prior to the firmware update, but since it seems much improved. Maybe it's just me.
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  #17  
Old 22nd August 2013
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Re: Comparison test

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Originally Posted by pvasc View Post
I have been playing with the DTC too. My tests were DTC vs RAW crop. But the question I have is, does anybody know if Oly improved the DTC output in the last firmware? I was not really pleased with the out put prior to the firmware update, but since it seems much improved. Maybe it's just me.
I had the same experience, tried the etc when I first got the camera and then dismissed it as a gimmick but it now appears to have some potential.

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  #18  
Old 22nd August 2013
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Re: Comparison test

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Originally Posted by Daveart View Post
Hi one other way to test how well the d.t.c works is to take the image the was taken without dtc and 2x crop in Photoshop to see if there is any real benefit to d.t.c, although I have the EM5 a 2x crop the conventional way through photoshop produces excellent results i.e. 16x12 size print with no degradation even using a loupe glass over the print it would appear that it could event go to 32x24 size print before any start of degradation takes place.

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This is just what I did but in LR5.

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  #19  
Old 22nd August 2013
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Re: Comparison test

Hi sorry David I missed read what you wrote, I just looked at your Exif on both as the lower one looked slightly sharper, and that was the x2 what is more interesting is that it was nearly half a stop lower iso maybe light changed a little.

Dave

PS I am on Firmware 1.7
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  #20  
Old 22nd August 2013
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Re: Comparison test

I enjoy "playing" with the limitations of things, so when the 2X DTC was mentioned again, it got me thinking.

600mm Sigma Lens
2X Hoya TC
OM to FT adapter
1.4X Zuiko D TC
FT to MFT adapter
DTC

On a 4/3rds sensor = 6720mm (35mm Equivalent)

But the weather was against me testing this today, so I left the EC14 out and just did a few "Quick-n-Dirty" snaps:

The red car is about 60m away


And this is what comes out the camera:


As "gate hardware" featured previously:


Resulting in this:


Fully accepting that the IQ has dropped to what you see from "other" glass, but if you really had to push the limits (as some of the Paps do) at least you can get a usable image.
With the right subject matter, it could be worth a fortune.
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  #21  
Old 22nd August 2013
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Re: Comparison test

Can we see a side on view of your setup? Surprisingly good results though.
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  #22  
Old 22nd August 2013
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Re: Comparison test

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Originally Posted by greenguru View Post
Can we see a side on view of your setup? Surprisingly good results though.


These are on a tree (normally covered in cormorants) that's about 150m away.


The Transit Van is 100m away

and you get this:


I've got an adapter somewhere that will fit a telescope...
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  #23  
Old 22nd August 2013
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Re: Comparison test

As a slight aside, the other use for the DTC is with C mount lenses.
You can use them normally without noticing any vignetting, albeit at effectively twice their focal length.

I've not really had a chance to play with it yet, but I acquired a Canon J6x11 11-70mm F1.4 TV lens a while ago. With DTC t will become a 22-140mm F1.4 on the OM-D. (or an impressive 44-280mm F1.4 in 35mm film terms)

Graham I see our posts crossed;
I also have an 800mm F8 Tokina I came across a while ago. Now with stacked Oly Digital converters, would give a decent focal length before invoking the DTC.
Shame the in body IS doesn't really go that high as it would make a lightweight birding lens

After that we get to the Russian 1000mm F8 lens which I really must try one day.
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  #24  
Old 23rd August 2013
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Re: Comparison test

One question that comes to mind - is the IBIS automatically adjusted to take into consideration the effective doubling of the focal length as with the 75-300mm @ 300mm it is difficult to keep the AF spot (which is double size) on a small subject - a bird's eye for instance?

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  #25  
Old 23rd August 2013
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Re: Comparison test

David - I don't think it should need to adjust the IS. The amount of shake needed is determined by the position of the lens and absolute size of the image on the sensor, and that won't change if you are using digital zoom.

Of course I could be wrong

John
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  #26  
Old 5th September 2013
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Re: Comparison test

I have realised I was wrong with my assumptions over this & have gone back to look at moon shots I had taken with the 2 X digital teleconverter. I was using the E-M5 with 75-300 lens.

I have a extra small crop of the original X 2 jpeg & a similar crop of a cropped one from the RAW to match the X 2 jpeg & up-sized to match the original (X 2) jpeg. The only difference is the original jpeg (OOC) was saved as Large Super Fine while the one developed from the RAW (in Oly Viewer 3) is at High Quality which would be equivalent to Large Fine (compression) from the camera.


Out of camera X 2 Digital Teleconverter extra small cropped sample (+ up-sized & sharpened to view here).


Extra small cropped sample of the cropped and up-sized image to match the X 2 jpeg (in Olympus Viewer 3) (+ up-sized & sharpened to view here).

I can now see the value of it for the OOC jpegs (& video) & it would be nice if the RAW could produce the same results in post processing (I probably can in Capture One).
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  #27  
Old 6th September 2013
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Re: Comparison test

Unless I'm very much mistaken, the dtc is literally a center crop. I haven't done any tests but I imagine cropping and interpolating in photoshop will give you better results as you have far more processing power on a PC. There is also the age old question of whether you ever need those extra pixels from interpolating anyway. Even a 3MP image will give you a 3X2 print with 680ppi!

The real question is whether a optical teleconverter degrades image quality so much that the original cropped image is as good/better which I wouldn't be surprised at. All that said, there is something pure about an optically created image over one that has been heavily cropped
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  #28  
Old 6th September 2013
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Re: Comparison test

The DTC is only available in jpeg and there is obviously some additional in-camera processing going on as the resultant image is of a higher quality than an identical jpeg cropped to the same size. That is not to say of course that additional pp in the appropriate software can't get even better results, however use of the DTC does confer some advantages if you regularly take subjects that need substantial cropping - wildlife etc.

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  #29  
Old 6th September 2013
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Re: Comparison test

Quote:
Originally Posted by benvendetta View Post
Do the em5 and ep5 also have digital teleconverters?
just discovered the epm-2 does
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