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2x Teleconverter

Paulinbna From United States of America, joined Feb 2003, 1114 posts, RR: 5
Posted (10 years 3 months 1 week 5 days 4 hours ago) and read 1374 times:

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I have two question about 2x teleconverter the screw in type for my minolta dimage 7i.

How will the teleconverter affect light and picture quality

and Can I stack two together and how will stacking affect light and picture quality.

Canon 50D user; 100-400 MM L IS 10-22 MM, 60MM Macro

7 replies: All unread, jump to last

Boeingholiday From Austria, joined Apr 2002, 456 posts, RR: 4
Reply 1, posted (10 years 3 months 1 week 5 days 2 hours ago) and read 1129 times:

A friend of mine has bought a teleconverter for his D-100 lens. Bad idea, the autofocus didn't work well, and the pictures were blurry and with low quality. That's what I know - haven't used one myself yet Big grin

Manzoori From UK - England, joined Sep 2002, 1516 posts, RR: 37
Reply 2, posted (10 years 3 months 1 week 5 days 1 hour ago) and read 1104 times:

Ahh but there's Teleconvertors and there's teleconvertors....

I have a cheapo Jessops 2x convertor for my Nikon SLR and yes the pictures are pretty poor. I suspect if I'd paid the several hundred pounds extra for a genuine Nikon teleconvertor the results would have been significantly better.

On the other hand, these are teleconvertors that sit between the camera body and the lens, whereas on the Digicams (i.e. non SLR) these teleconvertors sit on the front of the lens. Will that have an impact I wonder?

Rez
Wink/being sarcastic

Flightlineimages DOT Com Photographer & Web Editor. RR Turbines Specialist

Planedoctor From United States of America, joined Mar 2001, 286 posts, RR: 2
Reply 3, posted (10 years 3 months 1 week 4 days 13 hours ago) and read 1046 times:

Indeed there are 2 types of teleconverters. The SLR type is between camera and lens. They have drawbacks such as light loss as loss of sharpness. The type you put in front of your camera will have the same effect. The light loss will be harder to guage because there is no interface with the camera to tell the old versus new maximum aperture. You could know by setting Av to a determined value and see where your shutter speed sits before and after mounting the converter (pointing at the same light source throughout). The amount of sharpness lost varies with the quality of the teleconverter- but it will -never- be sharper than the naked lens! My experience with the AF with the front mount TC's shows that the AF is a little worse but I cannot quantify it for you at all.

Hope that helps a little.
-Ken

Photopilot From Cuba, joined Jul 2002, 2439 posts, RR: 20
Reply 4, posted (10 years 3 months 1 week 4 days 13 hours ago) and read 1049 times:

Well I use both types of tele-converters depending on the camera I am using.

I use a 2x auxillary lens, and also a fisheye and wide auxillary lenses on my Nikon CoolPix 950 and have had no problems at all. All three have had shots accepted here on A.net.

I also use a 2x on my SLR Nikon and again no problem. However there is a two-stop loss of light with the converter in place. It should be noted that if your prime lens is only a f:4.5 or so or a slow variable aperature lens, then the quality will suffer somewhat and the autofocus will most likely have problems due to the lower light levels reaching the AF sensors. My prime telephotos are all f:2.8 lenses so they work well, including autofocus with the extenders. This includes the 80-200mm f:2.8 and the 300mm f:2.8 lenses.

Perhaps why the quality stays good is that they are all Nikon converters and lenses. (no spam please) Big grin

Steve

CheshireCat From United States of America, joined Feb 2003, 11 posts, RR: 0
Reply 5, posted (10 years 3 months 5 days 15 hours ago) and read 970 times:

I've had a problem using TC's on my 7i. The lens shows up in the picture! I zoom out all the way but I cant get rid of it all. Angry

Has anything like this happened to you?

-Jordan

Ckw From UK - England, joined Aug 2010, 530 posts, RR: 18
Reply 6, posted (10 years 3 months 5 days 13 hours ago) and read 950 times:

Steve - I'm sure Nikon convertors work just fine in their own way - but can you stack 'em like Canon's? Sorry, couldn't resist Smile

View Large View Medium
Click here for bigger photo!

Colin K. Work, Pixstel

Manzoori From UK - England, joined Sep 2002, 1516 posts, RR: 37
Reply 7, posted (10 years 3 months 3 days 18 hours ago) and read 910 times:

*Sigh!*

That's the sort of photo I aspire to producing.... Once again, nice work Colin!

Wink/being sarcastic

Rez

Flightlineimages DOT Com Photographer & Web Editor. RR Turbines Specialist

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