cactuspic Loc: Dallas, TX

John Shaw in one of his books did a very interesting experiment. From a tripod mounted camera he shot the same scene with a wide angle and a telephoto making sure focus on the same point, using the same f/stop. Then he cropped the wide angle image to include the same field of view while enlarging the image so that the two were the same size when printed. Curiously, the depth of field was the same, although the quality of the wide angle enlargement was crap.

With regard to your specific question I think the depth of field will be the same but the effects of magnification will make the deterioration of focus from the point of focus more apparent with the T/C. The loss of light is just the inverse square rule as less light is now reaching the sensor. But this is easily checked with a simple test using the same f/stop and same point of focus with and without the T/C. By enlarging then non T/C image so that the two show the same area, you will be able to tell two things. 1. Whether the depth of field is the same. 2. The amount of image quality loss due to the T/C .

avflinsch Loc: Hamilton, New Jersey

I have an old Vivitar 2x with the built in macro focus ring. Having the 2 focus rings takes a bit of getting used to, but coupled with my 85mm f1.8 is is my favorite macro setup.

Lawmanb2 Loc: New Smyrna Beach, FL

Have made up my mind. I will check with one of my friends, borrow a lens and try for myself before I lay out any money.

billnikon Loc: Pennsylvania/Ohio/Florida/Maui/Oregon/Vermont

Only if u have a lens with f4 or faster and only a 1.4 converter. Any thing else and your burning money.

julian.gang

Hi Bill,
Let me tell you about my experience about six years ago with a Sony VCL-HG1758. I was standing on the shore of Lake Erie in Marblehead, Ohio, near the lighthouse. I took a picture of 1 of the gates at Cedarpoint of course the teleconversion lens was attached to a 50 times zoom camera, but I still thought it was impressive!...Julian

Mac Loc: Pittsburgh, Philadelphia now Hernando Co. Fl.

Lawmanb2 Loc: New Smyrna Beach, FL

Thanks, Julian.

Bill

LEWHITE7747 Loc: 33773

Has anyone done comparisons with a crop sensor vs a full frame sensor. I wonder if this would make a difference?

WJShaheen Loc: Gold Canyon, AZ

In general, I would agree with using OEM accessories. However, I've had excellent results with the Kenko 1.4x
https://www.bhphotovideo.com/c/product/1388012-REG/kenko_k_tphd1_4_n_teleplus_hd_1_4x_for.html/?ap=y&ap=y&smp=y&smp=y&lsft=BI%3A514&gclid=CjwKCAjwkJj6BRA-EiwA0ZVPVuoY5L4u0KGxsIx3M4WGzZgaTbNuRLhtqqrzfPnCIttbY9oi4R6j1xoCB-IQAvD_BwE

LEWHITE7747 Loc: 33773

Some of the experts on youtube say teleconverters shouldn't be used on crop camera's and that there may be some extra sharpness with full frames. I personally can't get anything more with my canon 1.4x. I crop with better results. It is an expensive paper weight. I sure some of you can get good results.

dennis2146 Loc: Eastern Idaho

I am wondering if you would give me your Nikon 1.4 TC so I can use it on a Nikon 300mm f4 I don't have.

Just a passing thought.

Dennis

olemikey Loc: 6 mile creek, Spacecoast Florida

Like anything, quality and price usually result in the better performance. I have found great variation in the 3rd party TC's, less in the prime MFG units. Some lenses respond much better than others, and the quality of your AF system can also make or break the pairing. My suggestion is to buy from someone who you can return it to if you are not happy...and avoid "cheap", though tempting, you may regret the purchase. Funny though, one of my favorites (I don't generally use them, but on occasion will) is an old Cambron 1.7X from my film days, it defies convention, but is sharper than most others I have tried or own.....no idea why, but it is a keeper. Must have been a good day at the factory of whoever made Cambron's gear.

Kmgw9v Loc: Miami, Florida

Perhaps I should dust it off and give it another try. 😀😀😀
Good thought though.

SuperflyTNT Loc: Manassas VA

For macro a simple extension tube would be better than a teleconverter and it would have no effect on IQ.

LEWHITE7747 Loc: 33773

I agree that a simple extension tube is the way to go for macro.