macro Focus Distance on Crop Sensor: I know that a 100 mm lens is still a 100 mm lens on a crop sensor. It just has the equivalent of 150 mm. On the other hand, does the focusing...

latebloomer Loc: Topeka, KS

I know that a 100 mm lens is still a 100 mm lens on a crop sensor. It just has the equivalent of 150 mm.

On the other hand, does the focusing distance remain the same for a 100 mm lens on a crop sensor camera as the focusing distance on a full sensor camera?

Please advise.
Thanks

Leitz Loc: Solms

latebloomer wrote:

I know that a 100 mm lens is still a 100 mm lens on a crop sensor. It just has the equivalent of 150 mm.

On the other hand, does the focusing distance remain the same for a 100 mm lens on a crop sensor camera as the focusing distance on a full sensor camera?

Please advise.
Thanks

Yes.

John_F Loc: Minneapolis, MN

As the lens law, (1/O + 1/I = 1/f where O = object distance from front Principal Plane, I = image distance from rear Principal Plane, and f = focal length) shows the size of the sensor does not matter. The size of object one wishes to capture would lead to choosing some particlar value of "O" however. Lke move in or move out.

Nikonian72 Loc: Chico CA

Shooting through your lens set to Minimum Focusing Distance (sensor to subject), will also dictate Minimum Working Distance (lens front element to subject), which is quite close to 160-mm for a 100-mm macro lens. Neither distance is effected by sensor size.

Here is a method to experience MWD:
FAQ: How to Document Field-of-View of a Macro Lens
http://www.uglyhedgehog.com/t-36370-1.html

mwsilvers Loc: Central New Jersey

latebloomer wrote:

I know that a 100 mm lens is still a 100 mm lens on a crop sensor. It just has the equivalent of 150 mm.

On the other hand, does the focusing distance remain the same for a 100 mm lens on a crop sensor camera as the focusing distance on a full sensor camera?

Please advise.
Thanks

The minimum focus distance (MFD) does not change

Bill_de Loc: US

Leitz wrote:

Yes.

Best direct answer to a simple question! ;)

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latebloomer Loc: Topeka, KS

Thank you to everyone. This is a great forum.

MW

Leitz wrote:

Yes.

Agree, but at that distance the magnification relative the sensor is subject to the 1.5 factor

MW

Leitz wrote:

Yes.

Agree, but at that distance the magnification relative the sensor is subject to the 1.5 factor

Leitz Loc: Solms

MW wrote:

Agree, but at that distance the magnification relative the sensor is subject to the 1.5 factor

I see no point in addressing a question that wasn't asked.

dmsM43

Actually the magnification is the same as well as the minimum focusing distance. The only thing that is different is the "field of view" compared to a full frame camera. That will be 1.5 times less on your crop sensor camera.

latebloomer Loc: Topeka, KS

dmsM43 wrote:

Actually the magnification is the same as well as the minimum focusing distance. The only thing that is different is the "field of view" compared to a full frame camera. That will be 1.5 times less on your crop sensor camera.

I am aware of the 1.5 effective magnification and was interested in the focusing distance and the advantages of a 150, 180, 200 macro lens.
Thank all of you for your advice.!!

rhadams824 Loc: Arkansas

latebloomer wrote:

I am aware of the 1.5 effective magnification and was interested in the focusing distance and the advantages of a 150, 180, 200 macro lens.
Thank all of you for your advice.!!

See Nikonian72's post on this inquiry. Also use the search feature at the top of the page. A search for macro lens or specifically the sizes you listed will provide you the information you seek.
If you use a search engine such as bing or google and look at the specifications for each size macro lens you will find the longer the lens the further away you can be to get the 1:1 picture. For a 100 mm it is about 6 inches.
The longer the lens generally the harder it is to reduce camera shake.
Do a search for tinusbum and also look at the true macro photography pictures at the bottom of the forum page and read the comments. They often state the lens length used and the advantages and disadvantages of the various lengths.

lovitlots Loc: Tottenham, Ontario, Canada

I advise that you try to get your answers via a computer search on youtube and other sites. The reason is, the first answer you got was the correct one. The rest of them except for the one confirming the right answer were sent to confuse the hell out of you. This happens way to much on this site. Use youtube as much as you can. The videos answer your question and you can see the answer as well.

LoneRangeFinder Loc: Left field

lovitlots wrote:

I advise that you try to get your answers via a computer search on youtube and other sites. The reason is, the first answer you got was the correct one. The rest of them except for the one confirming the right answer were sent to confuse the hell out of you. This happens way to much on this site. Use youtube as much as you can. The videos answer your question and you can see the answer as well.

Wellsometimes. There's a great deal of misinformation on the internetincluding utube.