AFS 600mm f/4 Protective Glass Element

<p>I'm in touch with a guy selling a 600/4 (1st AFS version) at around U$4,000. According to him, price is set slightly below average since the front lens has a little chip that “doesn't affect image quality” (blablabla).<br>

Does anyone know if this lens is equipped with a protective glass element (or permanent UV filter)? In such case, I could send it back to Nikon for repair, in the event the chip <em>does </em>affect image quality.<br>

Whether it needs repair or not, is this lens a good deal at this price point?<br>

I'm currently using a 500 Ai-P, and do mostly birds. I'm aware of the weight dilemma, but optically speaking, would you consider the 600 an improvement over the 500? Is the AF-S speed up to the task?<br>

Thank for your kind advice...<br>

Robert</p>

<p>The 600mm/f4 AF-S version 1 has a built-in protective flat element up front.</p>

<p>If there is a "little chip" on it, I would assume that it will seriously affect image quality and bargain down the price accordingly. US$4000 seems low for that lens, which may reflect overall condition for it. If you cannot inspect the lens in person, I would suggest asking for high-quality images showing the current condition of the lens in question.</p>

<p>That flat front element is essentially a fixed clear filter; you need to take the lens apart to replace it. And since it is a large "filter," expect to pay a few hundred dollars for the replacement. If I were you, I would check with Nikon Canada to get a repair cost estimate. Moreover, make sure that lens is not gray market or Nikon Canada may refuse service.</p>

<p>Because of the weight issue, most people prefer the 500mm/f4 AF-S over the 600mm/f4 AF-S, but if the weight and size don't bother you, extra reach is always welcome.</p>

<p>Probably Shun is right, but take a look here (just for fun) :<br>

<a href="http://www.lensrentals.com/news/2008.10.30/front-element-scratches">http://www.lensrentals.com/news/2008.10.30/front-element-scratches</a></p>

<p>Paul, I am afraid that you are missing my point.</p>

<p>I have zero idea how this "little chip" is like on the lens in question, and of course I also have no idea how it will or will not affect image quality. However, if I were a buyer, I would use that as an excuse to bargain down the price. In other words, I would factor in the cost to replace that flat front element as part of the overall cost for purchising this used lens.</p>

<p>A 600mm, f4 lens has roughtly a 600/4 = 150mm front element. Think about how much a clear 77mm filter is. A 150mm one isn't going to be cheap and there will also be some labor cost involved. If you need to ship it, it'll be a bit of a pain also.</p>

<p>Must be my english :)... You are totally right ! :).</p>

<p> </p>

<p>Hello Robert<br /> The glass can be replaced, the front element is just a protective cover. You should be able to get some form of an estimate by just phoning Nikon, I would guess about $350<br /></p>

<p>If indeed the chip is small I've heard of some photographers filling the chip with black paint. On a long lens it won't show in the photos and would prevent flaring in backlight situations. I haven't tried this technique but it sounds feasable to me.</p>

<p>The protective front element on the 600/4 AF-S I might be user removable. It is on the 200-400/4, and I think it might be on my 400/2.8 AF-S I. Google it and/or download the manual from nikon.com. Even if so, expect to pay at least a few hundred for a new one, but at least you wouldn't have to ship the lens back and forth. As far as handling, the lens is massive. Don't expect to be able to hand-hold it at all like you can your 500/4. Additionally, you might need to upgrade your support and/or get a wimberly-type head. Still, this could be a very good deal on a great lens, but you need to know what you're getting into. Buyer beware.</p>

<p>Andy, the 200-400mm/f4 AF-S VR has a clear filter attached to it when it is shipped. It is just like any other filter that you can unscrew (turning it counter-clockwise) to remove. The flat front element on the 600mm/f4 AF-S is built in and you need to take the (front of the) lens apart to replace it.</p>

<p>That is also why I feel that those people who are so strongly against using any protective filter silly.</p><div></div>

<p>Thanks a lot everybody for your input. I'm expecting some high res pictures of the lens, so I may revisit the case. And, yes, I will get my hand on this beast before going any further... just to feel the weight!<br>

Rob</p>

<p>If you can inspect that lens in person, it is the best way to go. Can you bring a DSLR body with you and test the lens by pointing it towards a source of light and see how the chip casues any flare issue?</p>

<p>Don't look into the viewfinder if you are pointing the lens towards the sun, though. I would use live view to compose in that case.</p>