Things need to note when...
What things do I need to be careful when I purchase new lenses? Like some technical or defects within the lenses themselves?.

Thank you,Din..

Comments (6)

You should have no worries with new lenses bought from reputable dealers as they should be covered by warranty against manufacturing defects. It is more important to know things like:If the front element rotates or stays still (can make it tricky with filters).

If the control rings twist the same way (clockwise/anticlockwise) as your other lenses. This would be like jumping into a car with the indicator stick on the wrong side compared to your car.If the filter ring diameter matches your existing filters..

If the lens retains all it's features on the camera body you are using. (Recent Nikon D40* issues / backward compatibility on other brands)..

John.Please visit me at:

Comment #1

If the lens does not come from the camera maker, make sure the particular lens is designed for your brand of camera..

I.e. Sigma makes lenses for Nikons, Canons, Pentaxes, etc., so make sure the box says Nikon if you have a Nikon body..

With Nikon, you need only certain Nikon lenses if you have a D40 or D40X they must have motors in them. Other makers' Niklon lenses may or may not work, (it's the motor issue) so double check. Sigma, for instance, just introduced a couple of lenses that have motros in the Nikon versions..

Be careful of old lenses mostly, manual focus lenses do not work on digital single lens reflex camewreras..


Comment #2

Thank you for the tips, but do I also need to take note of softness or mold around the lens itself?..

Comment #3

You first mentioned 'new' lenses. There should be no mold whatsoever, no visible oil or anything like that either. Softness of focus in a new lens should only be a characteristic of the lens design, not due to a fault. Front focus and back-focus issues however have been reported in some cases. Never buy a new lens without a warranty. Generally you get what you pay for..

John.Please visit me at:

Comment #4

Have a look at review of lenses on this site :.


It will take a while to get an idea for what makes a good lens, but you will read the word "compromise" a lot !.

A new lens should behave perfect;y within it's specification. Old lenses ( second hand ) can have fungus and other defects, which is why I buy them from good dealers - they usually give a warranty and usually rate the lens and tell you it's condition..

There are two types of lenses - prime and zoom. Prime lenses have a fixed focal length and are designed for high quality ( although they do not always achieve it ). Zooms can have their focal length varied, but this entails an optical compromise ( usually ). Zooms are convenient and versatile, primes are not. You need to have an understanding of what your shooting requirements are before you start buying lenses. For example, my priority is lightweight general purpose lenses of reasonable quality.

The rest of the time I use a 28-105 for walkabout and a 75-300 when I want more reach. The weight of all three lenses is less than the weight of some primes, so I'm accepting a trade-off in quality for versatility..

You need to identify your own priorities first..


Pentax K100DFuji S5200Fuji E900PCLinuxOS..

Comment #5

Buying a lens is very complex. I'm busy trying to decide on a new lens and am overwhelmed with the amazing variablilty! Factors include:.

SizeWeight# of "rings"How you switch to MF?Does lens have AF motor?What kind of motor? [micro, ultrasonic, or ring]How fast is AF motor?How quiet is AF motor?Are there tele-extenders that work with lens in auto mode?Is there a tripod mount on lens?Is the tripod mount removable?Quality of anti-reflection coatings?How hood mounts? [if hood mounts on outside of lens, difficult to use polarizer]Does hood reverse to store on lens?Does hood slide back for storage? [this offers little protection, if dropped]Does front element rotate? [difficult to use polarizer]Does lens change length with focus/zoom?Does rear element move? [important to minimize dust]Is aperture selectable on lens?Is lens sealed?What is lens made of? [metal, plastic, or combo]Does lens have a metal bayonet mount? [!!!]Does lens tell camera the distance information?.

Too many questions! .

Charlie DavisNikon 5700 & Sony R1HomePage: http://www.1derful.infoBridge Blog:

Comment #6

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