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Author Topic: One subject, three lenses  (Read 1079 times)
ErikKaffehr
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« on: May 01, 2013, 10:02:06 AM »
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Hi,

I have shot some spring flowers using three lenses:

Lenses:  

Zeiss Macro Planar 120/4CF for Hasselblad at f/8
Minolta 100/2.8 Macro at f/8
Sony 70-400/4-5.6G at 250 mm f/11

White balanced using second gray step on COlor Checker Passport Card. Same brightness on white petals. All images are here as JPG and DNG (raw): http://echophoto.dnsalias.net/ekr/Articles/ThreeLenses/

Full image (downscaled) with crop positions:

Camera Sony Alpha 99 SLT. Crops are at actual pixels. Focus on pistils of first crop using live view at 11X magnification. Second crop is for bookeh.
Zeiss Macro Planr 120/4 at f/8Minolta 100/2.8 at f/8Sony 70-400/4-5.6G at 250 mm f/11



Best regards
Erik
« Last Edit: May 02, 2013, 12:08:41 AM by ErikKaffehr » Logged

thierrylegros396
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« Reply #1 on: May 01, 2013, 11:00:09 AM »
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Unless I've vision problems it seems that it focus on petals for Zeiss, but on pistil for Minolta Wink

Did you use autofocus ?!
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ErikKaffehr
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« Reply #2 on: May 01, 2013, 01:41:02 PM »
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Hi,

I see the point.

Focus was on pistils of leftmost flower at maximum aperture, using live view at maximum magnification. Best I could achieve. Camera was not moved and conditions were not windy. Camera was on a very stable tripod, so any focusing error is mine, representing my own error margin.

Tripod has been moved and angle of view is a bit different. Moving the tripod was necessary to compensate for differences in focal length.

Best regards
Erik

« Last Edit: May 01, 2013, 08:31:02 PM by ErikKaffehr » Logged

theguywitha645d
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« Reply #3 on: May 01, 2013, 10:20:26 PM »
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Medium-format 120mm macro lenses seem to be universally good. I am not sure why that is a sweet spot, but there is some magic there.
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BernardLanguillier
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« Reply #4 on: May 01, 2013, 11:06:02 PM »
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Medium-format 120mm macro lenses seem to be universally good. I am not sure why that is a sweet spot, but there is some magic there.

Yes, but in this case I prefer the results of the Minolta 100mm.

Cheers,
Bernard
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A few images online here!
ErikKaffehr
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« Reply #5 on: May 02, 2013, 12:06:54 AM »
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Hi,

As Thierry pointed out there is a difference in focus between the Zeiss shot and the Minolta shot. I was trying to focus on the pistils in all images, but it seems I missed. The lower part of the pistil in the Zeiss image is in better focus than the top. The main question I asked if there were major differences in the way the lenses draw. If there are differences, they are not very obvious to me.

Best regards
Erik

Yes, but in this case I prefer the results of the Minolta 100mm.

Cheers,
Bernard
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