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Author Topic: Macro lenses  (Read 2772 times)

  • Offline Serious

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Re:Macro lenses
Reply #15 on: September 06, 2010, 03:21:58 AM
Quote from: Mongoose
Quote from: Serious
but this is for a 35mm sized sensor. A small sensor 1:2 will produce an image nearer 1:1 on small sensor cameras.


no, 1:1 is always 1:1 whether its 35mm film, APS-C digital, or large format sheet film for that matter. Macro ratios only refer to the size of the image on the capture device (film or sensor).


How high a ratio you can go to before your image is larger than your frame is another matter entirely, but a 25mm subject remains 25mm across whatever camera you point at it, so a 1:1 image of said subject is also always 25mm across at the sensor plane.


Sorry to sound nit picky, but I feel its important to get things like this exactly right from the start to avoid confusion later and Zpyder is obviously just trying to get what can be a pretty wierd set of conventions straight in his head.


Yep but try blowing up an image produced using a 1:1 lens on a full frame, 35mm sensor, camera and one using the same lens on a small sensor to the same percentage and the small will produce a bigger magnification all other things being equal. Lenses are based on 35mm frame size, not the smaller ones.

I know its meant to work the way you describe but varying factors change that when you go digital. A 1.5 million pixel sensor will not produce the same image as a 15 million pixel sensor, nor will a full frame 15 million pixel sensor produce the same as a 15 million pixel reduced size one.
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Macro lenses
Reply #16 on: September 06, 2010, 11:56:49 AM
the image is 1:1 on the sensor but the size of the sensor crops it, so its still 1:1 but your only capturing a section from the center surely thats how it works
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Macro lenses
Reply #17 on: September 06, 2010, 14:34:46 PM
Quote from: Binary Shadow
the image is 1:1 on the sensor but the size of the sensor crops it, so its still 1:1 but your only capturing a section from the center surely thats how it works


got it in one :)  :cheers:
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  • Offline zpyder

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Re:Macro lenses
Reply #18 on: September 06, 2010, 18:11:50 PM
And to confuse matters more, in this case would that mean compared to a full frame sensor of the same mp value, the 1.6 image, though cropped down, will be higher res?
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  • Offline zpyder

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Re:Macro lenses
Reply #19 on: September 07, 2010, 20:06:55 PM
New toy arrived this morning, only had a chance for a little bit of a play. I think this lens is going to take a bit of getting used to. That and Im going to need some better lighting, dont think the 40D flash quite cuts it!



Jay feather by Chris_Moody, on Flickr


Budwing Mantis by Chris_Moody, on Flickr

Bit hazy as its through the grotty tank glass...

Gordon the crab by Chris_Moody, on Flickr
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Macro lenses
Reply #20 on: September 07, 2010, 20:32:11 PM
ideally you want a macro ring flash for it
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  • Offline zpyder

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Re:Macro lenses
Reply #21 on: September 07, 2010, 21:07:03 PM
Yeah, sod that...for now. Ill be using it outdoors mostly so I doubt itll be too much of an issue. I know the photos above are a bit pants but Im impressed with them, on the grounds of the first 2 being quite a bit smaller than they look in those photos. The Both the feather and the mantis are only an inch long or so. Im also quite pleased how the lens does with things further away. If I head out this weekend I think Ill leave the 17-85mm at home and just take the 50mm and 100mm.
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Re:Macro lenses
Reply #22 on: September 08, 2010, 09:11:03 AM
Quote from: zpyder
And to confuse matters more, in this case would that mean compared to a full frame sensor of the same mp value, the 1.6 image, though cropped down, will be higher res?


yes, the crop sensor with the same total MP count has smaller pixels so higher spatial resolution.
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  • Offline zpyder

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Re:Macro lenses
Reply #23 on: September 11, 2010, 18:37:20 PM
So, didnt get to go out today as I stubbornly refused to believe that the weather would get better during the day, after spending the whole week being told today would have heavy rain.

But as the sun came out a few hours ago I ventured into the garden and took a few more shots when it was fairly sunny. Still learning, its weird having a prime, and the way the focus ring works, when you focus it down to its max it doesnt lock out but the ring keeps turning, which gets a bit confusing. Next time I think Ill use AV mode to try and increase the DOF a bit.


Wasp on a bug hotel I made a few months ago, pretty chuffed, both with the lens and the fact the bug hotel is working as intended.

Wasp on bug hotel by Chris_Moody, on Flickr

Flesh fly (I think) on the wooden fence at the back of the garden.

Fly by Chris_Moody, on Flickr



Rhododendron leafhopper by Chris_Moody, on Flickr
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  • Offline zpyder

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Re:Macro lenses
Reply #24 on: September 19, 2010, 11:07:44 AM
Some shots from yesterdays attempts:



Greenbottle (Lucilia caesar) by Chris_Moody, on Flickr




Spider by Chris_Moody, on Flickr


I know this one sucks, I used the built in flash as it was on the inside of the composter, but I just think the iridescence is pretty cool.

Iridescent spider by Chris_Moody, on Flickr


Woodlouse (Porcellio scaber) by Chris_Moody, on Flickr

One of the pinned beetle larvae I was photographing under the microscope, figured Id see how the lens faired just as is. Im guessing if I used a diffuser and an offset flash gun the shadows would have been much less harsh

Dytiscus circumcinctus larva by Chris_Moody, on Flickr

Lens does well as non-macro stuff too, a blue tit flew past and landed in a nearby hedge and watched me:

Blue Tit watching from a bush by Chris_Moody, on Flickr

Can deffo see the use for IS. I tried using my tripod a few times but because of the legs, it was pretty restrictive and every time I tried to position the set-up, the subject scarpered. Hopefully a new manfrotto in a few weeks will help.

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