solving 28mm f1.8 problem

[rfdesigner]

I bought one of these 2nd hand earlier this year and have been reasonably happy with it.

One recurring issue I've had got me to pull the thing apart and clean it inside: Veiling glare.

Having done this (immensely carefully) and checked it out thoroughly having put it back together (yes the AF is fine, not mucked up the optics, the glare is still there, but reduced a little.

I'm using this on a crop camera and I've never felt the EW-63 hood did very much for the lens, so I've tried a "mega hood". I created a paper hood by attacking a whole sheet of a4 paper wrapped around the little hood as a former, then I cut bits off with scissors and hey presto the glare was completely gone unless I had the sun in the field of view

The hood is 3 inches long to the petal notches, and 4 inches long overall (this is JUST wide enough on a crop not to vignet), se below for a comparison with the EW-63

I'm now looking at the ET-63 which is 2.5 inches long.. has anyone tried this?.. does the "63" bit mean it will mechanically fit my lens?

 

[rfdesigner]

The new hood is in and I can now reccomend the ET-63 for the 28f1.8 on a crop body, it's a perfect fit.

Sadly I still have a little veiling glare... even further inspection has finally picked up the trouble.. condensation of a thoroughly burried lens element... turns out its internal to a sealed lens group. (visible when a stong point source of light is shone into the lens front and viewed from the rear, not visible the other way around).

I've done a little more research and I'll try one more thing.. very slowly and carefully vacuuming the lens. We have a vacuum chamber at work and I've got the go ahead to use it.. fingers crossed!

 

[ajfotofilmagem]

Thanks for sharing your insights about the lens hood most appropriate for APS-C cameras.

When you look at the lens in backlit (off camera), you see dust inside? Normally, the dust in front elements has little influence on the image, but in the rear elements becomes more visible.

I would like to have a 28mm F1.8 lens (or 24) with good contrast and sharpness when wide open in my APS-C cameras. But I think the Canon 28mm F1.8 is outdated for today's cameras. I believe the anti reflective coatings are poor in digital cameras, and still waiting for a decent upgrade, or I'll buy the Sigma 30mm Art.

 

[rfdesigner]

Thanks for sharing your insights about the lens hood most appropriate for APS-C cameras.

When you look at the lens in backlit (off camera), you see dust inside? Normally, the dust in front elements has little influence on the image, but in the rear elements becomes more visible.

I would like to have a 28mm F1.8 lens (or 24) with good contrast and sharpness when wide open in my APS-C cameras. But I think the Canon 28mm F1.8 is outdated for today's cameras. I believe the anti reflective coatings are poor in digital cameras, and still waiting for a decent upgrade, or I'll buy the Sigma 30mm Art.

no not dust, but a sea of very very little dots, looks like a million little glass beads, dust never worries me.. my telescope only gets cleaned of dust annually if it's lucky.

For me I value fast and accurate AF over perfectly sharp in the corners ability.. I know the sigmas are better at shooting stationary objects.

Anyway I'll see how the lens fairs on Monday when I get it vacuumed.

 

[ajfotofilmagem]

Thanks for sharing your insights about the lens hood most appropriate for APS-C cameras.

When you look at the lens in backlit (off camera), you see dust inside? Normally, the dust in front elements has little influence on the image, but in the rear elements becomes more visible.

I would like to have a 28mm F1.8 lens (or 24) with good contrast and sharpness when wide open in my APS-C cameras. But I think the Canon 28mm F1.8 is outdated for today's cameras. I believe the anti reflective coatings are poor in digital cameras, and still waiting for a decent upgrade, or I'll buy the Sigma 30mm Art.

no not dust, but a sea of very very little dots, looks like a million little glass beads, dust never worries me.. my telescope only gets cleaned of dust annually if it's lucky.

For me I value fast and accurate AF over perfectly sharp in the corners ability.. I know the sigmas are better at shooting stationary objects.

Anyway I'll see how the lens fairs on Monday when I get it vacuumed.

According to my understanding, "a million little glass beads" are the same as dust.

You should know that a lens disassemble and clean it is very easy. ??? Difficult is to assemble again, with everything at the right place, and calibrate the focus. 8)