December 19, 2014, 08:46:36 PM

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Messages - RAKAMRAK

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16
Unless the object is flat, say a coin or a medallion, and the background is empty, say a flat colored background, the photos will not be the same.

It's just like portrait photography, with the nose looking too big relative to the ears when shooting from a short distance - perspective works for the front & back parts of the subject same as it works for the subject itself being in the foreground and other stuff being farther away in the background.

Therefore, if you shoot a diamond ring with the diamond facing the camera and the band away from it, the shorter the focal length the larger the diamond will look compared to the band.

This is actually the answer that I was looking for when I wrote the question. I had a hunch, but probably could not put my question properly. Thank you.

17
@100 Thanks for the link. But do you know any other source where I can get the 'effective focal length' information for the macros. The photozone website seems to have the information is only for the 100mm lenses. I will google it. But in case you know any other website please let me know. This is a very interesting piece of information.

18
Lenses / Re: Review: Sigma 150mm f/2.8 EX DG OS HSM Macro
« on: May 02, 2014, 04:47:16 PM »
Received my 'working' copy of the Sigma 150mm OS. It is actually the second unit of the lens that the store had to send me. The first unit had its focus mechanism malfunctioning.

I did not have any chance to explore its image quality yet. But here is my first impression of 'handling' the lens. (disclaimer I have not handled any white L lens of Canon).

It seems like a piece of brick. It is actually heavier than it looks. The outer shell seems to use some metal parts - which gives it an even more 'heavy' and 'hunky' feel. The cylindrical hood is pretty large. on top of that if I put the hood adapter (recommended for APS-C cameras) then it almost doubles in length. The OS seems alright. I could handhold and get good sharp photos at 1/10 sec shutter speed.

19
Thank you CRians. So my hunch was more or less right that the background will be slightly different. But from your replies it seems that such difference won't really matter in most cases (in few cases it might though). What will matter mainly is the subject to front element distance - which is generally longer for longer FL macro lenses.

Anyway, day before yesterday I received my Sigma 150mm OS. Waiting for the weekend to explore its abilities at the local park.

20
John thank you for the replies.
Correct, the distance is from the film/sensor (the phi type symbol). I was kind of brushing over those issues (the 50mm needs an extender type thing as well for 1:1).

You are quite right that it that longer macros will have shallower depth of field. But I am specifically looking info about perspective - no one talks about that - may be because it is not important as such. But still.....

21
Right, at 1:1 the same object will occupy exactly the same area of the image. Till this my understanding is clear. But ten things get a bit fuzzy for me.

Do you mean that the focal length difference of macro lenses have no effect on the 'image' (for example from the point of view of perspective) at 1:1 magnification other than the usability (that is subject to lens front distance while capturing the photogrpah)?

22
Let me explain my question a bit further. I have seen/used only two macro lenses till date Canon 100mm L and sigma 150mm OS. That also at a distance of more than 1 year. So I had no opportunity to test this question of mine.

What I am asking is, let's say I am photographing a small flower (pretty small) which is not going to occupy the entire image at 1:1 (let's say on a full frame camera). Now if I use different macro lenses - 50mm (Canon), [60mm (Tamron or Canon)-APS-C only], 70mm (Sigma), 90mm (Tamron), 100mm (Canon), 105mm (Sigma), 150mm (Sigma) or 180mm (Canon/Sigma/Tamron) -  at 1:1 magnification focusing distance (varying the distance between the flower and my camera, of course) would I get the same image (not talking about sharpness here)? Probably this may be framed slightly differently, what is the importance and significance of the angle of view of different macro lenses at their minimum (or comparable magnification) focusing distances?

In case any of you have used more than one lenses at the same time you may have some idea about this. Any comment will be highly appreciated. Even better is if any of you have images like this to demonstrate the difference/similarities.

23
Thank you guys. So at least some people here on Canon rumors also faced the same problem. That is comforting.

Thank you for taking time to reply. :)

24
EOS Bodies - For Stills / Canon 40D Main Dial (Front Dial) slipping
« on: April 21, 2014, 10:11:21 PM »
Have any of you faced this issue? My 40D's front/main dial started slipping a little. This is happening when I am trying to turn the dial anticlockwise, and not clockwise.

Searched google and found out some DIY cures for this. But just wondering if any of you have faced a similar problem ever or not.

25
Lenses / Re: Review: Sigma 150mm f/2.8 EX DG OS HSM Macro
« on: April 15, 2014, 07:43:13 PM »
Just bit the bullet after resisting myself for loooong. My Sigma 150 is coming soon.

26
Pricewatch Deals / Re: Sigma 50mm f/1.4 Art Available for Preorder
« on: April 11, 2014, 07:51:48 AM »
I cannot buy it right now, but it gives me immense pleasure that I correctly predicted the price at least .... yayyayayyyaa :)

27
(Just because I have not written on CR for many days so I felt I should write something)

The sigma lens will be priced at $999 (±$50) in USA.

I don't think you're too far off. I do expect the price to be 999 USD / 899 EUR.

How did I hit the bullseye?

28
(Just because I have not written on CR for many days so I felt I should write something)

The sigma lens will be priced at $999 (±$50) in USA.

30
Regional Boards / Re: Anyone from India?
« on: February 01, 2014, 06:21:51 PM »
I am from India, now temporarily in Atlanta, GA.

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