Post your best photo with the lens cap still on

tonylong wrote in post #7265516
I can't believe that nobody has mentioned the simple, yet exquisite and powerful method of bringing out lens cap beauty:

100 mm macro with 12,24,36 stacked tubes then stacked 1.4x & 2x TCs: awesome detail -- you should be able to capture the eyeballs of the neutrons!

GCGuy wrote in post #7267978
Great in theory! However, the resulting loss of IQ by stacking the TCs and the stacked tubes makes it difficult to see the catchlight in the neutron's eyeballs. More like a blurred light spot. I didn't try it with the TCs personally, but with the 12,24,36 stack I already noticed quite a degredation in the sharpness, not to mention the DOF was getting to the point you could only see the very front of the neutron's eye.

tharmsen wrote in post #7270068
Is this good ISO 800 performance?

tharmsen wrote in post #7270068
Is this good ISO 800 performance?

tharmsen wrote in post #7270068
Is this good ISO 800 performance?

tharmsen wrote in post #7270068
Is this good ISO 800 performance?

tharmsen wrote in post #7270068
Is this good ISO 800 performance?

tharmsen wrote in post #7270068
Is this good ISO 800 performance?

smorter wrote in post #7231530
Wow there are some strange posts in this thread, a lot of people seem to have the wrong idea about defective pixels



The frequency of defective pixels on a CMOS imaging sensor is not uniform across sensors. Different sensors have different amounts of defective pixels, and it's hard to tell the exact amount as many should be screened out during the intial production stage CMOS calibration





The dots are a sensor malfunction, it should not be affected by what the lens resolves optically (i.e. handshake should be irrelevant)


The lens cap is detached from the lens when photographing, and does not impede the optical path, nor affect it in any manner, so the brand of cap is irrelevant for image quality purposes. The only possible conceivable way that a lens cap type can affect resultant image quality from the lens is if the inside of the lens cap is poorly designed so that it ends up scratching the front element. Scratches may result in increased flare, and possibly loss of contrast


If you are getting strange colored dots in a photo which was taken with the lens cap on, it suggests you have defective pixels and that your CMOS will need to be recalibrated by Canon


The photo will likely come out pitch black, and the filter would thus make no meaningful impact on the image as there would be no discernible subject matter anyway


Canon deal with their products only, if you are suffering issues with other optical products, you would be better served to seek advice from the respective manufacturer. Having said that though, it would not be normal for corrective spectacles to exhibit symptoms of phenomena associated with electronic devices.


Defective pixels are a very real, and problematic issue though. You probably should have chosen a better topic to satirize.


You are misinformed here, the defective pixels are a sensor defect, and are not affected by optical limits such as diffraction.


As the lens cap will block the light from entering the lens, this is an irrelevant issue


A uniform color is indicative of a clean sensor. It is only when there are unusual marks or spots that a sensor clean may be required


The cap is to protect the front of the lens, it is not supposed to be on the lens when you take a photograph. As such, the lens cap itself has no direct implications for image quality, but may indirectly affect the image quality derived from the lens if it somehow damages the lens element or impedes your own performance through poor design. Canon lens caps are generally regarded as poor because they do not have a centre pinch function, which impairs their ease of use

Your statement suggests a lack of familiarity around camera systems. I suggest learning the functions of your equipment, and getting some experience before taking on weddings.


This is incorrect. Canon lens caps are generally regarded as poor because they do not have a centre pinch function, which impairs their ease of use. Tamron, Tokina and Nikon Caps are far superior with their centre pinch functions. I routinely replace my Canon caps with Tamron Caps from B&H Photo


Defect pixels are native to the sensor. Lens optical considerations are irrelevant. Changing aperture or DOF or focus will not affect the appearance of defect pixels


You don't HAVE to have a macro lens. You only need a macro lens if you want a 1:1 photo of the lens cap. But even then, you can probably get away with a lower magnification lens, and crop in.


This thread is about defective pixels on the CMOS imaging sensor. The Black dots were an imaging phenomena that has now been addressed, but defect pixels are still a problem, and Canon's poor QC is making it worse as these should be screened out during the initial CMOS calibration during production


Did you make a typo? Photographing with a lens cap on is designed to exacerbate the visual perception of defective pixels. By isolating these defective pixels against a black background, it allows the human eye to identify their location and occurrence easier.



Are you sure you aren't being ripped off? Lens Caps are usually under $10. You are grossly overpaying for lens caps.

JWright wrote in post #7271174
Amazing that you can actually convey a straight face in a typed statement...