Please read the following table in HTML format from a webpage and then answer the question in detail according to the table. Each table cell is defined by a <td> and a </td> tag. Each table row starts with a <tr> and ends with a </tr> tag. 'rowspan=m' and 'colspan=n' represents a cell spaning over 'm' rows and 'n' columns.

Webpage title:
Canon EF 600mm lens
Table title:
Specifications
Table:
<table id='hittask' contenteditable='False'>
<tr> <th colspan=1 rowspan=1 > Attribute </th><th colspan=1 rowspan=1 > f/4L USM </th><th colspan=1 rowspan=1 > f/4L IS USM </th><th colspan=1 rowspan=1 > f/4L IS II USM </th><th colspan=1 rowspan=1 > f/4L IS III USM </th></tr>
<tr> <th colspan=1 rowspan=1 > Image </th><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > - </td><td colspan=1 rowspan=1 >  </td></tr>
<tr> <th colspan=5 rowspan=1 > Key features </th></tr>
<tr> <th colspan=1 rowspan=1 > Full-frame compatible </th><td colspan=4 rowspan=1 > Yes Yes </td></tr>
<tr> <th colspan=1 rowspan=1 > Image stabilizer </th><td colspan=1 rowspan=1 > No No </td><td colspan=3 rowspan=1 > Yes Yes </td></tr>
<tr> <th colspan=1 rowspan=1 > Environmental sealing </th><td colspan=4 rowspan=1 > Yes Yes </td></tr>
<tr> <th colspan=1 rowspan=1 > Ultrasonic Motor </th><td colspan=4 rowspan=1 > Yes Yes </td></tr>
<tr> <th colspan=1 rowspan=1 > Stepping Motor </th><td colspan=4 rowspan=1 > No No </td></tr>
<tr> <th colspan=1 rowspan=1 > L-series </th><td colspan=4 rowspan=1 > Yes Yes </td></tr>
<tr> <th colspan=1 rowspan=1 > Diffractive Optics </th><td colspan=4 rowspan=1 > No No </td></tr>
<tr> <th colspan=1 rowspan=1 > Macro </th><td colspan=4 rowspan=1 > No No </td></tr>
<tr> <th colspan=5 rowspan=1 > Technical data </th></tr>
<tr> <th colspan=1 rowspan=1 > Focal length </th><td colspan=4 rowspan=1 > 600 mm </td></tr>
<tr> <th colspan=1 rowspan=1 > Aperture (max/min) </th><td colspan=4 rowspan=1 > f/4 / f/32 </td></tr>
<tr> <th colspan=1 rowspan=1 > Construction </th><td colspan=1 rowspan=1 > 9 elements / 8 groups </td><td colspan=1 rowspan=1 > 17 elements / 13 groups </td><td colspan=1 rowspan=1 > 16 elements / 12 groups </td><td colspan=1 rowspan=1 > 17 elements / 13 groups </td></tr>
<tr> <th colspan=1 rowspan=1 > # of diaphragm blades </th><td colspan=2 rowspan=1 > 8 </td><td colspan=2 rowspan=1 > 9 (circular aperture) </td></tr>
<tr> <th colspan=1 rowspan=1 > Closest focusing distance </th><td colspan=1 rowspan=1 > 6 m (17.95 ft) </td><td colspan=1 rowspan=1 > 5.5 m (16.45 ft) </td><td colspan=1 rowspan=1 > 4.5 m (14.8 ft) </td><td colspan=1 rowspan=1 > 4.2 m (13.78 ft) </td></tr>
<tr> <th colspan=1 rowspan=1 > Max. magnification </th><td colspan=1 rowspan=1 > 0.11× </td><td colspan=1 rowspan=1 > 0.12× </td><td colspan=2 rowspan=1 > 0.15× </td></tr>
<tr> <th colspan=1 rowspan=1 > Horizontal viewing angle </th><td colspan=4 rowspan=1 > 3°30' </td></tr>
<tr> <th colspan=1 rowspan=1 > Vertical viewing angle </th><td colspan=4 rowspan=1 > 2°20' </td></tr>
<tr> <th colspan=1 rowspan=1 > Diagonal viewing angle </th><td colspan=4 rowspan=1 > 4°10' </td></tr>
<tr> <th colspan=5 rowspan=1 > Physical data </th></tr>
<tr> <th colspan=1 rowspan=1 > Weight </th><td colspan=1 rowspan=1 > 6000 g (212.4 oz) </td><td colspan=1 rowspan=1 > 5360 g (189.8 oz) </td><td colspan=1 rowspan=1 > 3920 g (138.8 oz) </td><td colspan=1 rowspan=1 > 3050 g (107.6 oz) </td></tr>
<tr> <th colspan=1 rowspan=1 > Maximum diameter </th><td colspan=1 rowspan=1 > 167 mm (6.6") </td><td colspan=3 rowspan=1 > 168 mm (6.6") </td></tr>
<tr> <th colspan=1 rowspan=1 > Length </th><td colspan=2 rowspan=1 > 456 mm (17.9") </td><td colspan=2 rowspan=1 > 448 mm (17.6") </td></tr>
<tr> <th colspan=1 rowspan=1 > Filter diameter </th><td colspan=1 rowspan=1 > 48 mm (rear) </td><td colspan=3 rowspan=1 > Any 52(WII)-series drop-in filter </td></tr>
<tr> <th colspan=5 rowspan=1 > Accessories </th></tr>
<tr> <th colspan=1 rowspan=1 > Lens case </th><td colspan=1 rowspan=1 > ? </td><td colspan=1 rowspan=1 > 600 </td><td colspan=1 rowspan=1 > 600B </td><td colspan=1 rowspan=1 > 600C </td></tr>
<tr> <th colspan=1 rowspan=1 > Lens hood </th><td colspan=1 rowspan=1 > ET-161 </td><td colspan=1 rowspan=1 > ET-160 </td><td colspan=1 rowspan=1 > ET-160 (WII) </td><td colspan=1 rowspan=1 > ET-160 (WIII) or ET-160B </td></tr>
<tr> <th colspan=1 rowspan=1 > Lens cap </th><td colspan=1 rowspan=1 > E-180II </td><td colspan=1 rowspan=1 > E-185 </td><td colspan=1 rowspan=1 > E-185B </td><td colspan=1 rowspan=1 > E-185C </td></tr>
<tr> <th colspan=5 rowspan=1 > Retail information </th></tr>
<tr> <th colspan=1 rowspan=1 > Release date </th><td class="highlighted"  colspan=1 rowspan=1 > November 1988 </td><td colspan=1 rowspan=1 > September 1999 </td><td colspan=1 rowspan=1 > June 2011 </td><td colspan=1 rowspan=1 > September 2018 </td></tr>
<tr> <th colspan=1 rowspan=1 > Currently in production? </th><td colspan=3 rowspan=1 > No No </td><td colspan=1 rowspan=1 > Yes </td></tr>
<tr> <th colspan=1 rowspan=1 > MSRP US$ </th><td class="highlighted"  colspan=1 rowspan=1 > 923,000 yen </td><td colspan=1 rowspan=1 > 1,290,000 yen (w/case and hood) </td><td colspan=1 rowspan=1 > $11,499.00 </td><td colspan=1 rowspan=1 > $12,999.00 </td></tr>
</table>
Question:
When was the  f/4L USM lens released?
Answer:
The f/4L USM lens was released in November 1988 (923,000 yen).