July 28, 2014, 10:56:01 AM

Show Posts

This section allows you to view all posts made by this member. Note that you can only see posts made in areas you currently have access to.


Messages - cr316892

Pages: [1] 2
1
Lenses / Re: How to fix zoom creep on EF-S 17-55mm f/2.8 IS USM Lens?
« on: September 10, 2013, 03:07:33 PM »
I watched the video just now, and have a couple of comments.
 
1.  While the person marked the position of the body to the table, he did not mark the position of the lens carrier.  The lens MUST be inserted in exactly the same position as it was before, or the image will be decentered. Mark the lens carrier to body!!
 
2.  The person did not mention that you need a proper screwdriver to avoid damaging the screw heads, they look like Phillips, but they are JIS and a JIS screwdriver with magnetic tip can keep you from damaging things.
 
3.  Use a plastic or wood tool to remove the ring on the front of the lens.  Its just asking for trouble to use a metal screwdriver. A toothpick should work.

I appreciate all of your help and suggestions.

These were more or less the same instructions from the LensRentals blog earlier this year:

http://www.lensrentals.com/blog/2013/05/a-few-easy-lens-dustings

I just did the dust clean out, and it literally took me less than five minutes.

2
Lenses / Re: How to fix zoom creep on EF-S 17-55mm f/2.8 IS USM Lens?
« on: September 10, 2013, 03:02:03 PM »
The nylon collars on the screws guide the zoom unit.  They sometimes crack and the piece falls in the focus mechanism which can cause focus issues or even jamb the mechanism.  Usually, it just makes for a rough zoom or for one side being oof.

The collars are actually made of brass, so they are not worn down or anything.

I wasn't sure if these three collars are designed to be the points where friction is created. I have read various things online.

If they are, then it would probably be easy to come up with a fix.

For example, there seems to be a little bit of slack between the brass collars and the rotating plastic slots. If I stick a piece of paper to fill the slack space, the amount of friction created seems almost perfect. It would be trivial to come up with a permanent solution to create friction along this slot.

Quote
The lenses I've worked on had a friction liner which wears out after years of hard use.  I've never has to open my 17-55.
 
You would likely need to replace the part with the liner on it.  I've tried replacing the friction band, but adding a carefully wrapped layer of black pvc tape worked for me.
 
That fix means you cannot leave it in the sun, or adhesive may run into other parts of the lens.  I only did it on a old lens that was not worth a proper fix.

So there is definitely a friction band inside? I have cut a strip of paper and stuck it down between the main barrel and focus ring and tried to feel around for a friction band, and I haven't been able to feel anything. If there is one, then it is completely worn down.

3
Lenses / Re: How to fix zoom creep on EF-S 17-55mm f/2.8 IS USM Lens?
« on: September 09, 2013, 11:30:08 PM »
Other than home brew methods, you will need Canon to replace some parts.  I've not heard of zoom creep on this lens, something is not right.

Yikes, I hope not. Everything else seems to be fine, no signs of abuse.

4
Lenses / Re: How to fix zoom creep on EF-S 17-55mm f/2.8 IS USM Lens?
« on: September 09, 2013, 11:28:22 PM »
I really do appreciate these suggestions, but I'm trying to figure out how to repair the lens itself.

Basically, the first step is figuring out where the friction is actually created. I figure it's one of three ways:

1. I slipped the zoom ring off, and I see these three screws with brass collars around them. Are these collars what provide the friction?



2. Is it something like a strip of felt tape like for this Nikon lens:

http://static.photo.net/attachments/bboard/00I/00I1XU-32348784.pdf

3. Or is it something else like an adjustable tension screw or internal tension spring?

I'd like to find out for sure so I can decide how much I want to disassemble this lens.

Thanks

5
Lenses / How to fix zoom creep on EF-S 17-55mm f/2.8 IS USM Lens?
« on: September 09, 2013, 07:23:36 PM »
I just bought a used EF-S 17-55mm f/2.8 IS USM lens.

I got a really good deal because I was able to bid down the price as there was dust in the front barrel and because the lens exhibited noticeable zoom creep. Other than that, the lens is in perfect optical and cosmetic condition.

Basically, I intend to clean the dust out by following this video:

Canon 17-55 Small | Large


and I figure that if I am already going to be opening up the lens, I can try to fix the zoom creep as well.

I tried finding information about this particular lens, but I was not able to find much that was helpful.

Does anyone know how to fix the zoom creep on this lens, or can you point me to a resource somewhere? I am comfortable ordering parts if I need to.

P.S. I know there are lensband/rubberband solutions, but at this moment, I'm not interested in those.

6
Lenses / Re: Canon 24-105mm f/4 IS : Seller's remorse?
« on: August 23, 2013, 01:04:05 PM »
I just wonder, am I missing something obvious about this lens? I have wanted to love it since I bought it over a year ago. So many people on this forum and others extoll its virtues (IQ, versatility, IS). To be frank - I just haven't seen it. And I think it sounds great on paper - good FL range, IS, compactness. It SHOULD be my go-to walkaround lens. But it isn't.


If you are using the 24-105 on a cropped-frame camera, it will never be anywhere near as sharp as if you use it on a full-frame camera.

http://www.dxomark.com/index.php/Lenses/Compare-Camera-Lenses/Compare-lenses/%28lens1%29/169/%28brand%29/Canon/%28camera1%29/619/%28lens2%29/164/%28brand2%29/Canon/%28camera2%29/619/%28lens3%29/164/%28brand3%29/Canon/%28camera3%29/795

7
If you take two pictures at the same position with the same lens on both a crop and a full frame, the distance between the nearest in focus object and the furthest away in focus object will be the same, so the depth of field does not change. Obviously the image captured will be different on each.

However, if you're talking about the depth of field for an equivalent picture, you'd have to move the full frame camera closer which would result in a reduced depth of field.
This is correct.

The optics are identical.

With a cropped-frame camera, you are cropping the frame. It's the equivalent of taking a picture with a full-frame camera, and cropping in Lightroom or Picasa (resolution and image quality aside).

8
EOS Bodies - For Stills / Re: GPS suggestions
« on: July 09, 2013, 02:47:19 PM »
I use the "Tracks" app on my iPhone. There is a free version with ads, and you can upgrade to an ad-free version.

Since I always have my iPhone with me, I just open the app when I am taking pictures I want to geotag.

It functions as a GPS logger, and you can download the logfiles to your computer.

(I haven't done a ton of research on this, and there might be better apps out there. But this one works well for me.)

I use exiftool to do the actual tagging in the exif data.

This was an easy solution for me, though I know some people might find this cumbersome.

I don't think this is any more complicated than using a standard GPS logger.

9
It's actually $2399 once you check out. ;)
Yeah, I had just added it to my cart, and didn't log in and proceed to check out.

The B&H website doesn't even instruct you to proceed to check out to see the discounted price.

It seems kind of weird that they wouldn't just show you the discount when you add it to your cart.

Not complaining, though.

These deals should be clarified, because some people cannot see the price reduction right away (until they go to the cart checkout). Yeah, I know. Some people can't read. LOL
You're talking to someone who hasn't read a manual for anything in more than twenty years.  :P

10
Your math is wrong on the 6D deal:

$2599 - $400 = $2199.

11
EOS Bodies / Re: Canon EOS 70D Spec List
« on: June 27, 2013, 10:04:31 PM »
I'm a bit disappointed that there is no GPS.

I find geotagging to be a useful feature. I know others may not agree.

12
EOS Bodies / Re: Sell 60D now or after 70D is shipping?
« on: April 17, 2013, 10:03:26 AM »
I appreciate all of the advice in this thread.

To be clear, what I'm trying to figure out is what the trends are for the pricing of used cameras when their replacements are announced, irrespective of the next camera I will buy (or not buy).

I mention the 70D primarily because I want to figure out how its announcement/release will impact the value of a used 60D.

What's the marginal loss the longer I wait? That's what I'm really trying to figure out.

Is it going to be a case of, "You're not going to lose much more by holding onto the 60D,"

or

"You're better of selling it now because it's not going to be worth anything in a few months."

I have given a lot of thought of upgrading to a 6D, so that is under serious consideration.

I am open to a 70D, with all of the rumored specs, new sensor, etc. Obviously, I would have to wait somehow.

I'm also open to keeping the 60D, for all of the reasons mentioned in this thread.

Thanks

13
EOS Bodies / Re: Sell 60D now or after 70D is shipping?
« on: April 17, 2013, 06:50:56 AM »
I'd probably sell it "now" if I were you(that way Ms. Shuttercount still looks very pretty), ;)
Safe side would be to sell it after the 70D's official announcement is released.
So you'd know what you're gonna be upgrading to.
Thanks for your input.

A few more considerations:

One of the reasons I am considering the 6D because it's already being discounted. The 70D will have an early adopters' premium.

Also, I like to use Magic Lantern, though this is not a requirement. It's in alpha for the 6D, and obviously not going to be available for the 70D for a while.

14
EOS Bodies / Re: Sell 60D now or after 70D is shipping?
« on: April 17, 2013, 06:26:00 AM »
it will probably go down; before announcing a new model canon will probably try to clear the inventory of 60D lowering the prices, so also the price of used stuff will go down
Yeah, I think that's already happening.

The kit with the current rebates is available for for $999. eBay for a used 60D is $750 tops.

So if I sell right now, the most I can hope to get is maybe $750. If I wait until after the 70D is announced, will I only be able to get $600? $500?

How much more is this going to depreciate?

15
EOS Bodies / Sell 60D now or after 70D is shipping?
« on: April 17, 2013, 05:47:22 AM »

I received a brand new 60D kit (with 18-135mm lens) last year for Black Friday (I didn't even have to wait for Christmas). So it's only a few months old, and I've only taken a couple thousand pictures, and it is in mint condition.

I was considering upgrading to either the 70D or 6D, and was wondering about what the optimal time would be to sell the 60D.

It appears that on eBay/Craigslist, the most I might be able to get is maybe $750, so a lot of depreciation has already occured.

My question is, when the replacement is announced, will the used price plummet, or will it remain relatively stable? If it's not going to drop much more in value, then I'll probably hang onto it for a while.

However, if the price is going to go through the floor, I'll seriously consider selling it soon/now, even before the 70D is announced/shipping.

(I know a lot of this is contintent on the 70D specs, but looking for general advice.)

Thanks

Pages: [1] 2