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17 messages
17 total messages Started by Donald_Reese Wed, 11 Mar 2009 00:46
D700 crop factor
#852
Author: Donald_Reese
Date: Wed, 11 Mar 2009 00:46
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Was wondering if any of you could explain why the file size is reduced when using a dx lens on a full frame camera? I guess i assumed the dx lenses would lose part of the field of view,but what was left would use the full sensor. I am mistaken i guess, but need to know going forward.
Re: D700 crop factor
#853
Author: Ann_Shelbourne
Date: Wed, 11 Mar 2009 00:52
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1043 bytes
A lens actually creates a circular image (which falls off considerably towards the perimeter) so we only arrange things so that we use the good part of the image.

A DX lens covers a much smaller circle than one designed to cover a Full-sizes frame (which you have on a D700). If you use a DX lens you need to use it on a a DX-sized frame.

Perhaps the D700 sets that automatically if you insert a DX lens?
Re: D700 crop factor
#854
Author: Donald_Reese
Date: Wed, 11 Mar 2009 01:26
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863 bytes
You get a crop frame in the viewfinder, but i assumed the image actually filled the sensor, and still took advantage of all the pixels, but with less lens coverage. i saw my frame counter actually change its count with the dx lens attached,but did not immediately make the connection.
Re: D700 crop factor
#855
Author: Ann_Shelbourne
Date: Wed, 11 Mar 2009 01:41
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868 bytes
I just checked my D3 manual and the default seems to be that the camera will automatically crop to the DX format when a DX lens is mounted but you can change that behaviour in the menus by choosing:

Auto DX Crop: Off
Re: D700 crop factor
#856
Author: Donald_Reese
Date: Wed, 11 Mar 2009 01:53
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659 bytes
I think that just means the camera will either show you the crop frame or hide it.
Re: D700 crop factor
#858
Author: Ann_Shelbourne
Date: Wed, 11 Mar 2009 02:09
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841 bytes
I assume that it means that your recorded image gets cropped to the smaller DX size (2784px x 1848px) instead of the FX Format 4256px x 2832px).

I don't possess any DX lenses but the best way to find out would be to take some test shots and see what you get
Re: D700 crop factor
#859
Author: Donald_Reese
Date: Wed, 11 Mar 2009 02:15
1 lines
644 bytes
Yes i guess i will. i had to use a work lens on my camera, so i was stuck with it.
Re: D700 crop factor
#860
Author: Ram�n_G_Casta�eda
Date: Wed, 11 Mar 2009 02:22
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794 bytes
When I mounted a Pentax DA lens (a 1.5 crop digital lens) on a 35mm film camera, I actually got a circle, or mostly a circle, as in a case of severe vignetting. I'll be very curious to hear what you get. :)
Re: D700 crop factor
#863
Author: Fred_Nirque
Date: Wed, 11 Mar 2009 03:51
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836 bytes
Turn the DX crop off as Ann mentions, Donald, and the result of using a DX lens on a full-frame camera will be immediately obvious and why the crop actually crops off the edges of the FX sensor. Turning the crop off does more than switching off the outline in the viewfinder.
Re: D700 crop factor
#882
Author: -shep-
Date: Wed, 11 Mar 2009 22:21
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902 bytes
Hate to break topic here, couldn't remember what thread I saw this in.

Donald, was it you that mentioned a few weeks ago about a 1 terabyte hard drive you found---I think at Target---for less than $100.

Was it Target?
What was the price?
Was that a special sale do you know?
What brand?

Thanks. Sorry for the hijacking of the thread.
Re: D700 crop factor
#887
Author: Donald_Reese
Date: Wed, 11 Mar 2009 23:28
1 lines
712 bytes
Shep, i think the one i mentioned was a 750 gig maxtor for 139 as i recall. thats the one I got anyway
Re: D700 crop factor
#894
Author: -shep-
Date: Thu, 12 Mar 2009 01:00
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671 bytes
I could have sworn someone mentioned a 1 TB drive for around $100...ah, well.

Did you get it at Target, Donald?
Re: D700 crop factor
#895
Author: Donald_Reese
Date: Thu, 12 Mar 2009 01:06
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694 bytes
Yes i did, and i seem to recall someone getting something bigger as well. it was around the holidays,so they were dealing on items.
Re: D700 crop factor
#896
Author: -shep-
Date: Thu, 12 Mar 2009 01:17
2 lines
616 bytes
Thanks. I must've mis-read or mis-remembered something.
%(
Re: D700 crop factor
#897
Author: Wade_Zimmerman
Date: Thu, 12 Mar 2009 01:51
1 lines
778 bytes
You could have gotten and external 1 TB seagate for I think it was $129 I got one that is specially geared to the Mac that is 1.5 TB and cost like $229.00 from Seagate. Internal version cost $169.00
Re: D700 crop factor
#902
Author: Ram�n_G_Casta�eda
Date: Thu, 12 Mar 2009 03:20
1 lines
718 bytes
If there's a Fry's near you, keep looking at their newspaper supplements, Their web prices are different and local offers are not reflected there.
Re: D700 crop factor
#903
Author: John Joslin
Date: Thu, 12 Mar 2009 08:14
5 lines
794 bytes
Just google "terabyte drive" and then look under Shopping Results.

You can sort from low to high or select a price bracket.

I tend to do this before any purchase to avoid kicking myself later. ;)
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